Rewriting

This commit is contained in:
Anthony Scemama 2020-06-24 00:14:18 +02:00
parent 352276a99a
commit 529081f9ca
18 changed files with 1350 additions and 37 deletions

View File

@ -140,6 +140,7 @@ $$
[[file:h2o-dz-bfd.png]]
*** QMC
#+TBLFM: $11=(2.*$6+$9-$3) :: $12=sqrt(2.*$7*$7+$10*$10+$4*$4)
#+NAME:h2o-dz-bfd-qmc
| | H_{2}O | | | | H | | | O | | | |
| $\mu$ | N_{det} | E(DMC) | Error | N_{det} | E(DMC) | Error | N_{det} | E(DMC) | Error | E_atomization | |
@ -317,22 +318,22 @@ $$
*** QMC
#+NAME:h2o-tz-bfd-qmc
| | H_{2}O | | | | H | | | O | | | |
| $\mu$ | N_{det} | E(DMC) | Error | N_{det} | E(DMC) | Error | N_{det} | E(DMC) | Error | E_atomization | |
|-------+--------+----------------+--------------+------+---------------+--------------+-------+----------------+--------------+--------------+--------------|
| 1.e-6 | 11 | -17.2567442368 | 0.0000674814 | 1 | -0.4999898051 | 0.0000065175 | 32 | -15.8930902787 | 0.0000578329 | 0.36367435 | 8.9349534e-5 |
| 0.20 | 23 | -17.2567293499 | 0.0000806448 | 1 | -0.5000210771 | 0.0000097491 | 18 | -15.8930200016 | 0.0000473829 | 0.36366719 | 9.4545295e-5 |
| 0.30 | 53 | -17.2537172349 | 0.0005108024 | 1 | -0.4999868887 | 0.0000149003 | 22 | -15.8928444962 | 0.0000484284 | 0.36089896 | 5.1352550e-4 |
| 0.50 | 1442 | -17.2577489156 | 0.0001590032 | 1 | -0.4999987389 | 0.0000138110 | 95 | -15.8933526777 | 0.0001305214 | 0.36439876 | 2.0663819e-4 |
| 0.75 | 3213 | -17.2583975528 | 0.0002828675 | 1 | -0.5000191125 | 0.0000109315 | 431 | -15.8962312871 | 0.0000796553 | 0.36212804 | 2.9427536e-4 |
| 1.00 | 6743 | -17.2609826285 | 0.0002158278 | 1 | -0.4999862089 | 0.0000119766 | 571 | -15.8985297947 | 0.0000845907 | 0.36248042 | 2.3243086e-4 |
| 1.75 | 54540 | -17.2635480054 | 0.0001864936 | 1 | -0.4999666515 | 0.0000131903 | 1064 | -15.9030314207 | 0.0000811325 | 0.36058328 | 2.0423103e-4 |
| 2.50 | 51691 | -17.2643468817 | 0.0003484087 | 1 | -0.4999801617 | 0.0000094324 | 1879 | -15.9044556541 | 0.0000797733 | 0.35993090 | 3.5767351e-4 |
| 3.80 | 103059 | -17.2636697373 | 0.0002950991 | 1 | -0.5000085861 | 0.0000085475 | 1846 | -15.9046408769 | 0.0000732723 | 0.35901169 | 3.0429990e-4 |
| 5.70 | 102599 | -17.2631675892 | 0.0003358884 | 1 | -0.5000055184 | 0.0000147803 | 1944 | -15.9042738928 | 0.0000731262 | 0.35888266 | 3.4439131e-4 |
| 8.50 | 101803 | -17.2632963114 | 0.0003799317 | 1 | -0.5000010336 | 0.0000123807 | 1943 | -15.9044520693 | 0.0000761691 | 0.35884217 | 3.8788709e-4 |
| inf | 200521 | -17.2638832283 | 0.0002702253 | 1 | -0.4999916320 | 0.0000135918 | 15699 | -15.9039263267 | 0.0000874602 | 0.35997364 | 2.8467609e-4 |
#+TBLFM: $11=(2.*$6+$9-$3) :: $12=sqrt(2.*$7*$7+$10*$10+$4*$4)
| | H_{2}O | | | | H | | | O | | | |
| $\mu$ | N_{det} | E(DMC) | Error | N_{det} | E(DMC) | Error | N_{det} | E(DMC) | Error | E_atomization | |
|-------+---------+----------------+--------------+------+---------------+--------------+-------+----------------+--------------+--------------+--------------|
| 1.e-6 | 23 | -17.2567442368 | 0.0000674814 | 1 | -0.4999898051 | 0.0000065175 | 32 | -15.8930902787 | 0.0000578329 | 0.36367435 | 8.9349534e-5 |
| 0.20 | 23 | -17.2567293499 | 0.0000806448 | 1 | -0.5000210771 | 0.0000097491 | 18 | -15.8930200016 | 0.0000473829 | 0.36366719 | 9.4545295e-5 |
| 0.30 | 219 | -17.2537172349 | 0.0005108024 | 1 | -0.4999868887 | 0.0000149003 | 22 | -15.8928444962 | 0.0000484284 | 0.36089896 | 5.1352550e-4 |
| 0.50 | 1699 | -17.2577489156 | 0.0001590032 | 1 | -0.4999987389 | 0.0000138110 | 95 | -15.8933526777 | 0.0001305214 | 0.36439876 | 2.0663819e-4 |
| 0.75 | 13362 | -17.2583975528 | 0.0002828675 | 1 | -0.5000191125 | 0.0000109315 | 431 | -15.8962312871 | 0.0000796553 | 0.36212804 | 2.9427536e-4 |
| 1.00 | 25673 | -17.2609826285 | 0.0002158278 | 1 | -0.4999862089 | 0.0000119766 | 571 | -15.8985297947 | 0.0000845907 | 0.36248042 | 2.3243086e-4 |
| 1.75 | 207475 | -17.2635480054 | 0.0001864936 | 1 | -0.4999666515 | 0.0000131903 | 1064 | -15.9030314207 | 0.0000811325 | 0.36058328 | 2.0423103e-4 |
| 2.50 | 858123 | -17.2643468817 | 0.0003484087 | 1 | -0.4999801617 | 0.0000094324 | 1879 | -15.9044556541 | 0.0000797733 | 0.35993090 | 3.5767351e-4 |
| 3.80 | 1621513 | -17.2636697373 | 0.0002950991 | 1 | -0.5000085861 | 0.0000085475 | 1846 | -15.9046408769 | 0.0000732723 | 0.35901169 | 3.0429990e-4 |
| 5.70 | 1629655 | -17.2631675892 | 0.0003358884 | 1 | -0.5000055184 | 0.0000147803 | 1944 | -15.9042738928 | 0.0000731262 | 0.35888266 | 3.4439131e-4 |
| 8.50 | 1643301 | -17.2632963114 | 0.0003799317 | 1 | -0.5000010336 | 0.0000123807 | 1943 | -15.9044520693 | 0.0000761691 | 0.35884217 | 3.8788709e-4 |
| inf | 1631982 | -17.2638832283 | 0.0002702253 | 1 | -0.4999916320 | 0.0000135918 | 15699 | -15.9039263267 | 0.0000874602 | 0.35997364 | 2.8467609e-4 |
#+TBLFM: |$11=(2.*$6+$9-$3) :: $12=sqrt(2.*$7*$7+$10*$10+$4*$4)
#+BEGIN_SRC gnuplot :var data=h2o-tz-bfd-qmc :output file :file h2o-tz-bfd-qmc.png
reset
@ -349,7 +350,7 @@ $$
[[file:h2o-tz-bfd-qmc.png]]
*** ECMD
#+NAME:h2o-tz-bfd-ecmd
| | H_{2}O | | H | | O | | |
| $\mu$ | N_{det} | E(CIPSI) | N_{det} | E(CIPSI) | N_{det} | E(CIPSI) | E_atomization |
@ -402,9 +403,6 @@ $$
}
#+END_SRC
#+RESULTS:
[[file:./coefs-h2o.png]]
** TODO cc-pVQZ-BFD
#+begin_example
HYDROGEN
@ -1986,7 +1984,7 @@ return result
#+TBLFM: @>$7='(org-sbe "madformula" (data @5$7..@>>$7) ) :: @>$8='(org-sbe "maderrformula" (data @5$8..@>>$8) )
***** MAD = 5.42 +/- 0.29
*** TODO FCI
*** DONE FCI
**** CIPSI
***** Table
#+NAME: dz-cipsi-inf
@ -2065,28 +2063,85 @@ return result
| | | | MAD | 23.62 |
#+TBLFM: @>$5='(org-sbe "madformula" (data @5$5..@>>$5) )
***** MAD = 23.62
**** TODO QMC with Jastrow
**** QMC with Jastrow
***** Table
#+NAME: dz-dmc-inf
| | Total E | | Delta E | | Reference | Error | |
| | Hartree | | Hartree | | Hartree | kcal/mol | |
|---------+------------+----------+----------+----------+-----------+------------+----------|
| Be | -1.007625 | 0.000014 | 0.000000 | 0.000020 | | | |
| C | -5.431715 | 0.000065 | 0.000000 | 0.000092 | | | |
| Cl | -14.962307 | 0.000256 | 0.000000 | 0.000362 | | | |
| F | -24.193487 | 0.000257 | 0.000000 | 0.000363 | | | |
| H | -0.499996 | 0.000007 | 0.000000 | 0.000010 | | | |
| Li | -0.196329 | 0.000004 | 0.000000 | 0.000006 | | | |
| N | -9.798226 | 0.000105 | 0.000000 | 0.000149 | | | |
| Na | -0.182136 | 0.000008 | 0.000000 | 0.000011 | | | |
| O | -15.900621 | 0.000176 | 0.000000 | 0.000249 | | | |
| P | -6.472697 | 0.000089 | 0.000000 | 0.000126 | | | |
| S | -10.124922 | 0.000191 | 0.000000 | 0.000271 | | | |
| Si | -3.765137 | 0.000063 | 0.000000 | 0.000089 | | | |
|---------+------------+----------+----------+----------+-----------+------------+----------|
| | | | | | | 5.38 | 0.19 |
| BeH | -1.579924 | 0.000058 | 0.072304 | 0.000060 | 0.079400 | -4.452718 | 0.037652 |
| C2H2 | -12.491177 | 0.001978 | 0.627755 | 0.001982 | 0.642400 | -9.189949 | 1.243661 |
| C2H4 | -13.747858 | 0.002165 | 0.884445 | 0.002169 | 0.899000 | -9.133250 | 1.360919 |
| C2H6 | -14.980890 | 0.002993 | 1.117486 | 0.002996 | 1.136900 | -12.182781 | 1.880250 |
| CH2_1A1 | -6.715937 | 0.000274 | 0.284230 | 0.000282 | 0.288900 | -2.930337 | 0.176733 |
| CH2_3B1 | -6.730926 | 0.000247 | 0.299220 | 0.000256 | 0.304100 | -3.062465 | 0.160633 |
| CH3 | -7.415930 | 0.000433 | 0.484228 | 0.000439 | 0.490800 | -4.124162 | 0.275260 |
| CH3Cl | -22.511728 | 0.003261 | 0.617719 | 0.003272 | 0.631000 | -8.333880 | 2.053169 |
| CH4 | -8.092352 | 0.001733 | 0.660654 | 0.001735 | 0.670300 | -6.052881 | 1.088669 |
| CH | -6.063309 | 0.000142 | 0.131598 | 0.000156 | 0.133900 | -1.444348 | 0.098110 |
| Cl2 | -30.006770 | 0.001417 | 0.082156 | 0.001507 | 0.094000 | -7.432073 | 0.945753 |
| ClF | -39.247103 | 0.001471 | 0.091309 | 0.001515 | 0.100100 | -5.516449 | 0.950520 |
| ClO | -30.948491 | 0.002849 | 0.085563 | 0.002866 | 0.104700 | -12.008590 | 1.798595 |
| CN | -15.511536 | 0.001716 | 0.281595 | 0.001721 | 0.288800 | -4.521091 | 1.079775 |
| CO | -21.740502 | 0.002046 | 0.408166 | 0.002055 | 0.413700 | -3.472682 | 1.289362 |
| CO2 | -37.838828 | 0.001777 | 0.605871 | 0.001812 | 0.621400 | -9.744893 | 1.137305 |
| CS | -15.809393 | 0.002280 | 0.252755 | 0.002289 | 0.274000 | -13.331407 | 1.436248 |
| F2 | -48.437580 | 0.002788 | 0.050606 | 0.002835 | 0.062200 | -7.275352 | 1.779096 |
| H2CO | -22.914591 | 0.002667 | 0.582263 | 0.002674 | 0.596700 | -9.059348 | 1.677865 |
| H2O | -17.257153 | 0.000554 | 0.356541 | 0.000582 | 0.371900 | -9.637832 | 0.365219 |
| H2O2 | -33.210861 | 0.001813 | 0.409628 | 0.001847 | 0.429400 | -12.406998 | 1.158935 |
| H2S | -11.410576 | 0.000694 | 0.285663 | 0.000720 | 0.292000 | -3.976713 | 0.451833 |
| H3COH | -24.133288 | 0.001467 | 0.800970 | 0.001480 | 0.818700 | -11.126046 | 0.928505 |
| H3CSH | -18.293307 | 0.003131 | 0.736687 | 0.003138 | 0.757000 | -12.746473 | 1.969176 |
| HCl | -15.630053 | 0.000503 | 0.167751 | 0.000564 | 0.171000 | -2.039062 | 0.354034 |
| HCN | -16.216313 | 0.002143 | 0.486376 | 0.002146 | 0.496900 | -6.603748 | 1.346757 |
| HCO | -22.262328 | 0.002545 | 0.429996 | 0.002552 | 0.444700 | -9.226696 | 1.601523 |
| HF | -24.908111 | 0.000426 | 0.214628 | 0.000498 | 0.226100 | -7.198764 | 0.312367 |
| HOCl | -31.608392 | 0.001374 | 0.245468 | 0.001409 | 0.264700 | -12.068155 | 0.883968 |
| Li2 | -0.431300 | 0.000009 | 0.038642 | 0.000012 | 0.038900 | -0.162060 | 0.007643 |
| LiF | -24.606552 | 0.000507 | 0.216736 | 0.000568 | 0.222000 | -3.303261 | 0.356414 |
| LiH | -0.788098 | 0.000017 | 0.091774 | 0.000019 | 0.092430 | -0.411737 | 0.011790 |
| N2 | -19.949099 | 0.001829 | 0.352648 | 0.001841 | 0.364600 | -7.499767 | 1.155305 |
| N2H4 | -22.254991 | 0.001486 | 0.658557 | 0.001501 | 0.699600 | -25.754667 | 0.941605 |
| Na2 | -0.390694 | 0.000021 | 0.026422 | 0.000027 | 0.026800 | -0.237078 | 0.016780 |
| NaCl | -15.300352 | 0.001292 | 0.155910 | 0.001317 | 0.157400 | -0.935284 | 0.826560 |
| NH | -10.425927 | 0.000232 | 0.127706 | 0.000255 | 0.133500 | -3.635724 | 0.159726 |
| NH2 | -11.079579 | 0.000445 | 0.281362 | 0.000457 | 0.290400 | -5.671417 | 0.286744 |
| NH3 | -11.758534 | 0.000858 | 0.460322 | 0.000865 | 0.475500 | -9.524365 | 0.542585 |
| NO | -25.925608 | 0.002478 | 0.226761 | 0.002487 | 0.244500 | -11.131121 | 1.560528 |
| O2 | -31.978613 | 0.002212 | 0.177370 | 0.002240 | 0.192400 | -9.431204 | 1.405783 |
| OH | -16.563942 | 0.000322 | 0.163325 | 0.000367 | 0.170200 | -4.313827 | 0.230286 |
| P2 | -13.109626 | 0.002003 | 0.164231 | 0.002011 | 0.186000 | -13.660387 | 1.262016 |
| PH2 | -7.712455 | 0.000403 | 0.239766 | 0.000413 | 0.244000 | -2.656750 | 0.259404 |
| PH3 | -8.350324 | 0.000878 | 0.377640 | 0.000883 | 0.389000 | -7.128757 | 0.553934 |
| S2 | -20.401043 | 0.002564 | 0.151199 | 0.002593 | 0.164000 | -8.032937 | 1.626850 |
| Si2 | -7.640979 | 0.000961 | 0.110705 | 0.000969 | 0.121000 | -6.460521 | 0.608056 |
| Si2H6 | -11.365871 | 0.002677 | 0.835623 | 0.002680 | 0.849000 | -8.394027 | 1.681992 |
| SiH2_1A1 | -5.006581 | 0.000257 | 0.241453 | 0.000265 | 0.243000 | -0.970756 | 0.166341 |
| SiH2_3B1 | -4.974331 | 0.000249 | 0.209203 | 0.000258 | 0.210000 | -0.499925 | 0.161639 |
| SiH3 | -5.624316 | 0.000625 | 0.359192 | 0.000629 | 0.363000 | -2.389674 | 0.394463 |
| SiH4 | -6.276132 | 0.001187 | 0.511013 | 0.001189 | 0.515000 | -2.502072 | 0.746197 |
| SiO | -19.954964 | 0.002217 | 0.289206 | 0.002225 | 0.306700 | -10.977712 | 1.396411 |
| SO2 | -42.290926 | 0.002157 | 0.364762 | 0.002194 | 0.414400 | -31.148522 | 1.377029 |
| SO | -26.212229 | 0.002411 | 0.186686 | 0.002425 | 0.200700 | -8.794218 | 1.521950 |
|---------+------------+----------+----------+----------+-----------+------------+----------|
| | | | | | | 7.38 | 1.08 |
#+TBLFM: @>$7='(org-sbe "madformula" (data @5$7..@>>$7) ) :: @>$8='(org-sbe "maderrformula" (data @5$8..@>>$8) )
***** MAD = 8.05 +/- 0.42
***** Figure
#+BEGIN_SRC gnuplot :var data=data-g2-qmc-fci-jast :output file :file data-g2-qmc-dz-fci-jast.png
reset
set xtics rotate
plot data u 7:xtic(1) w l notitle, data u :7:8 w err notitle, 1 notitle, -1 notitle, \
data2 u 7:xtic(1) w l notitle, data2 u :7:8 w err notitle, 1 notitle, -1 notitle
#+END_SRC
#+RESULTS:
[[file:data-g2-qmc-dz-1.0-jast.png]]
***** MAD = 7.38 +/- 1.08
** pVTZ, BFD
*** DONE CCSD(T)
**** Table
@ -4210,8 +4265,6 @@ for name, basis, method, mu in data:
#+RESULTS:
[[file:rsdft.csv]]
** RUNNING
- DZ FCI DMC
** TODO Temps CPU pour DMC
@ -4305,3 +4358,53 @@ for name, basis, method, mu in data:
- [ ] DMC TZ FCI (tres cher...)
- [ ] DMC TZ Hartree-Fock
* Work
** Figure 1
#+NAME:tab1
| $\mu$ | | N_{det} | E(DMC) | Error | N_{det} | E(DMC) | Error |
|------+------------+--------+----------------+--------------+---------+----------------+--------------|
| 0.00 | 0. | 11 | -17.2535927658 | 0.0000616883 | 23 | -17.2567442368 | 0.0000674814 |
| 0.20 | 0.16666667 | 23 | -17.2537299553 | 0.0000673868 | 23 | -17.2567293499 | 0.0000806448 |
| 0.50 | 0.33333333 | 1442 | -17.2539120512 | 0.0001475010 | 1699 | -17.2577489156 | 0.0001590032 |
| 0.75 | 0.42857143 | 3213 | -17.2551351593 | 0.0001757492 | 13362 | -17.2583975528 | 0.0002828675 |
| 1.00 | 0.5 | 6743 | -17.2566320269 | 0.0001881680 | 25673 | -17.2609826285 | 0.0002158278 |
| 1.75 | 0.63636364 | 54540 | -17.2595366309 | 0.0003193539 | 207475 | -17.2635480054 | 0.0001864936 |
| 2.50 | 0.71428571 | 51691 | -17.2593693798 | 0.0002564347 | 858123 | -17.2643468817 | 0.0003484087 |
| 3.80 | 0.79166667 | 103059 | -17.2586706893 | 0.0002222800 | 1621513 | -17.2636697373 | 0.0002950991 |
| 5.70 | 0.85074627 | 102599 | -17.2577349871 | 0.0002927319 | 1629655 | -17.2631675892 | 0.0003358884 |
| 8.50 | 0.89473684 | 101803 | -17.2572986405 | 0.0002283964 | 1643301 | -17.2632963114 | 0.0003799317 |
| inf | 1 | 200521 | -17.2567650693 | 0.0005779960 | 1631982 | -17.2638832283 | 0.0002702253 |
#+TBLFM: $2=$1/($1+1)
#+BEGIN_SRC gnuplot :var data=tab1 :output file :file ../Manuscript/h2o-dmc.pdf
set termoption font "Times"
set termoption fontscale 0.6
reset
set grid
set xrange [.0:1.00]
set key top right
set xlabel "{/Symbol m}"
set ylabel "E_{DMC}"
set format y "%.3f"
set ytics 0.001
set xtics ("DFT" 0, "0.2" 0.2/1.2, "0.5" 0.5/1.5, "0.75" 0.75/1.75, "1.0" 0.5, \
"1.75" 1.75/2.75, "2.5" 2.5/3.5, "3.8" 3.8/4.8, "5.7" 5.7/6.7, "8.5" 8.5/9.5, "FCI" 1)
set style fill transparent solid 0.25 # partial transparency
set style fill noborder # no separate top/bottom lines
plot data u 2:($4+$5):($4-$5) w filledcurves notitle lc "blue", \
data u 2:4 w l lc "blue" title "VDZ-BFD",\
data u 2:($7+$8):($7-$8) w filledcurves notitle lc "red", \
data u 2:7 w l lc "red" title "VTZ-BFD"
#+END_SRC
#+RESULTS:
[[file:../Manuscript/h2o-dmc.pdf]]

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@ -0,0 +1,311 @@
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}
@incollection{Sav-INC-96,
author = {A. Savin},
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year = {1996}
}
@article{TouColSav-PRA-04,
author = {J. Toulouse and F. Colonna and A. Savin},
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publisher = {APS},
year = {2004},
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volume = {70},
number = {6},
pages = {062505},
keywords = {density functional theory; wave functions; exchange interactions (electron); electron correlations}
}
@article{FraMusLupTou-JCP-15,
author = {O. Franck and B. Mussard and E. Luppi and J. Toulouse},
title = {Basis convergence of range-separated density-functional theory},
journal = {J. Chem. Phys.},
volume = {142},
pages = {074107},
year = {2015}
}
@article{GinPraFerAssSavTou-JCP-18,
author = {Emmanuel Giner and Barth\'elemy Pradines and Anthony Fert\'e and Roland Assaraf and Andreas Savin and Julien Toulouse},
title = {Curing basis-set convergence of wave-function theory using
density-functional theory: A systematically improvable approach},
journal = {J. Chem. Phys.},
volume = {149},
pages = {194301},
year = {2018}
}
%PBE functional
@article{PerBurErn-PRL-96,
author = {J. P. Perdew and K. Burke and M. Ernzerhof},
title = {Generalized Gradient Approximation Made Simple},
journal = {Phys. Rev. Lett.},
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year = {1996},
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}
@article{GolWerStoLeiGorSav-CP-06,
author = {E. Goll and H.-J. Werner and H. Stoll and T. Leininger and P. Gori-Giorgi and A. Savin},
journal = {Chem. Phys.},
volume = {329},
pages = {276},
year = {2006}
}
%Beyond LDA for short-range functionals
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\newcommand{\LCT}{Laboratoire de Chimie Théorique (UMR 7616), Sorbonne Université, CNRS, Paris, France}
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\newcommand{\LCPQ}{Laboratoire de Chimie et Physique Quantiques (UMR 5626), Université de Toulouse, CNRS, UPS, France}
\begin{document}
\title{Enabling high accuracy diffusion Monte Carlo calculations with
range-separated density functional theory and selected configuration interaction}
\author{Anthony Scemama}
\affiliation{\LCPQ}
\author{Emmanuel Giner}
\email{emmanuel.giner@lct.jussieu.fr}
\affiliation{\LCT}
\author{Anouar Benali}
\email{benali@anl.gov}
\affiliation{\ANL}
\author{Pierre-Fran\c{c}ois Loos}
\email{loos@irsamc.ups-tlse.fr}
\affiliation{\LCPQ}
\begin{abstract}
\end{abstract}
\maketitle
\section{Introduction}
\label{sec:intro}
\section{Range-separated DFT in a nutshell}
\label{sec:rsdft}
\subsection{Exact equations}
\label{sec:exact}
The exact ground-state energy of a $N$-electron system with
nuclei-electron potential $v_\mathrm{ne}(\textbf{r})$ can be expressed
by the following minimization over $N$-representable densities
$n$~\cite{Lev-PNAS-79,Lie-IJQC-83}
\begin{equation}
E_0 = \min_n \left\{ \mathcal{F}[n] + \int v_\mathrm{ne}(\textbf{r}) n(\textbf{r}) \mathrm{d} \textbf{r} \right\},
\label{E0}
\end{equation}
with the standard constrained-search universal density functional
\begin{equation}
\mathcal{F}[n] = \min_{\Psi\rightarrow n} \left \langle\Psi|\hat{T}+\hat{W}_\mathrm{ee}|\Psi \right \rangle,
\label{Fn}
\end{equation}
where $\hat{T}$ and $\hat{W}_\mathrm{ee}$ are the kinetic-energy and
Coulomb electron-electron interaction operators, respectively. The
minimizing multideterminant wave function in Eq.~\eqref{Fn} will be
denoted by $\Psi[n]$. In RS-DFT, the universal density functional is
decomposed as~\cite{Sav-INC-96,TouColSav-PRA-04}
\begin{equation}
\mathcal{F}[n] = \mathcal{F}^{\mathrm{lr},\mu}[n] + \bar{E}_{\mathrm{Hxc}}^{\mathrm{sr,}\mu}[n],
\label{Fdecomp}
\end{equation}
where $\mathcal{F}^{\mathrm{lr},\mu}[n]$ is a long-range (lr)
universal density functional
\begin{equation}
\label{lr_univ_fonc}
\mathcal{F}^{\mathrm{lr},\mu}[n]= \min_{\Psi\rightarrow n} \left
\langle\Psi|\hat{T}+\hat{W}_\mathrm{ee}^{\mathrm{lr},\mu}|\Psi
\right \rangle,
\end{equation}
and $\bar{E}_{\mathrm{Hxc}}^{\,\mathrm{sr,}\mu}[n]$ is the
complementary short-range (sr) Hartree-exchange-correlation (Hxc)
density functional. In Eq.~(\ref{lr_univ_fonc}),
$\hat{W}_\mathrm{ee}^{\mathrm{lr}}$ is the long-range
electron-electron interaction defined as
\begin{equation}
\hat{W}_\mathrm{ee}^{\mathrm{lr},\mu} = \frac{1}{2} \iint w_{\mathrm{ee}}^{\mathrm{lr},\mu}(r_{12}) \hat{n}_2(\textbf{r}_1,\textbf{r}_2)
\mathrm{d} \textbf{r}_1 \mathrm{d} \textbf{r}_2,
\end{equation}
with the error-function potential
$w_{\mathrm{ee}}^{\mathrm{lr},\mu}(r_{12})=\mathrm{erf}(\mu\, r_{12}
)/r_{12}$ (expressed with the interelectronic distance $r_{12} =
||\textbf{r}_1-\textbf{r}_2||$) and the pair-density operator
$\hat{n}_2(\textbf{r}_1, \textbf{r}_2)=\hat{n}(\textbf{r}_1)
\hat{n}(\textbf{r}_2) - \delta(\textbf{r}_1-\textbf{r}_2)
\hat{n}(\textbf{r}_1)$ where $\hat{n}(\textbf{r})$ is the density
operator. The range-separation parameter $\mu$ corresponds to an
inverse distance controlling the range of the separation and the
strength of the interaction at $r_{12} = 0$. For a given density, we
will denote by $\Psi^\mu[n]$ the minimizing multideterminant wave
function in Eq.~\eqref{lr_univ_fonc}. Inserting the decomposition of
Eq.~\eqref{Fdecomp} into Eq.~\eqref{E0}, and recomposing the two-step
minimization into a single one, leads to the following expression for
the exact ground-state electronic energy
\begin{equation}
\label{min_rsdft} E_0= \min_{\Psi} \left\{
\left
\langle\Psi|\hat{T}+\hat{W}_\mathrm{{ee}}^{\mathrm{lr},\mu}+\hat{V}_{\mathrm{ne}}|\Psi\right
\rangle
+ \bar{E}^{\mathrm{sr},\mu}_{\mathrm{Hxc}}[n_\Psi]\right\},
\end{equation}
where the minimization is done over normalized $N$-electron
multideterminant wave functions, $\hat{V}_{\mathrm{ne}} = \int
v_{\mathrm{ne}} (\textbf{r}) \hat{n}(\textbf{r}) \mathrm{d}
\textbf{r}$, and $n_\Psi$ refers to the density of $\Psi$, i.e.
$n_\Psi(\textbf{r})=\left \langle\Psi|\hat{n}(\textbf{r})|\Psi\right
\rangle$.
The minimizing multideterminant wave function $\Psi^\mu$ in
Eq.~\eqref{min_rsdft} can be determined by the self-consistent
eigenvalue equation
\begin{equation}
\label{rs-dft-eigen-equation}
\hat{H}^\mu[n_{\Psi^{\mu}}] \ket{\Psi^{\mu}}= \mathcal{E}^{\mu} \ket{\Psi^{\mu}},
\end{equation}
with the long-range interacting Hamiltonian
\begin{equation}
\label{H_mu}
\hat{H}^\mu[n_{\Psi^{\mu}}] = \hat{T}+\hat{W}_{\mathrm{ee}}^{\mathrm{lr},\mu}+\hat{V}_{\mathrm{ne}}+ \hat{\bar{V}}_{\mathrm{Hxc}}^{\mathrm{sr},\mu}[n_{\Psi^{\mu}}],
\end{equation}
where
$\hat{\bar{V}}_{\mathrm{Hxc}}^{\mathrm{sr},\mu}[n]=\int \delta \bar{E}^{\mathrm{sr},\mu}_{\mathrm{Hxc}}[n]/\delta n(\textbf{r}) \, \hat{n}(\textbf{r}) \mathrm{d} \textbf{r}$
is the complementary short-range Hartree-exchange-correlation
potential operator. Note that $\Psi^{\mu}$ is not the exact physical
ground-state wave function but only an effective wave
function. However, its density $n_{\Psi^{\mu}}$ is the exact physical
ground-state density. Once $\Psi^{\mu}$ has been calculated, the exact
electronic ground-state energy is obtained by
\begin{equation}
\label{E-rsdft}
E_0= \braket{\Psi^{\mu}|\hat{T}+\hat{W}_\mathrm{{ee}}^{\mathrm{lr},\mu}+\hat{V}_{\mathrm{ne}}|\Psi^{\mu}}+\bar{E}^{\mathrm{sr},\mu}_{\mathrm{Hxc}}[n_{\Psi^\mu}].
\end{equation}
Note that, for $\mu=0$, the long-range interaction vanishes,
$w_{\mathrm{ee}}^{\mathrm{lr},\mu=0}(r_{12}) = 0$, and thus RS-DFT
reduces to standard KS-DFT. For $\mu\to\infty$, the long-range
interaction becomes the standard Coulomb interaction,
$w_{\mathrm{ee}}^{\mathrm{lr},\mu\to\infty}(r_{12}) = 1/r_{12}$, and
thus RS-DFT reduces to standard wave-function theory (WFT).
\subsection{Approximations}
\label{sec:approx}
Provided that the exact short-range complementary functional is known
and that the wave function $\Psi^{\mu}$ is developed in a complete
basis set, the theory is exact and therefore provides the exact
density and ground state energy whatever value of $\mu$ is chosen to
split the universal Levy-Lieb functional (see Eqs. \eqref{Fdecomp} and
\eqref{lr_univ_fonc}). Of course in practice, two kind of
approximations must be made: i) the approximation of the wave function
by using a finite basis set, ii) the approximation on the exact
complementary functionals. As long as approximations are made, the
theory is not exact anymore and might depend on $\mu$.
Despite its $\mu$ dependence, approximated RS-DFT schemes provide
potentially appealing features as: i) the approximated wave function
$\Psi^{\mu}$ is an eigenvector of a non-divergent operator
$\hat{H}^\mu[n_{\Psi^{\mu}}]$ (see Eqs. \eqref{H_mu} and
\eqref{rs-dft-eigen-equation}) and therefore converges more rapidly
with respect to the basis set~\cite{FraMusLupTou-JCP-15}, and also
produces more compact wave function~\cite{GinPraFerAssSavTou-JCP-18}
as it will be illustrated here, ii) the semi-local approximations for
RS-DFT complementary functionals are usually better suited to describe
the remaining short-range part of the electron-electron correlation.
In this work, we use the short-range version of the
Perdew-Burke-Ernzerhof (PBE)~\cite{PerBurErn-PRL-96} exchange and
correlation functionals of Ref.~\onlinecite{GolWerStoLeiGorSav-CP-06}
(see also Refs.~\onlinecite{TouColSav-JCP-05,GolWerSto-PCCP-05}) which
takes the form
\begin{eqnarray}
\bar{E}^{\mathrm{sr},\mu,\textsc{pbe}}_{\mathrm{x/c}}[n] = \int \bar{e}_\mathrm{{x/c}}^\mathrm{sr,\mu,\textsc{pbe}}(n(\textbf{r}),\nabla n(\textbf{r})) \, \mathrm{d}\textbf{r}.
\end{eqnarray}
\section{Computational details}
\label{sec:comp-details}
All the calculations were made using BFD
pseudopotentials\cite{Burkatzki_2008} with the associated double, triple
and quadruple zeta basis sets.
CCSD(T) and DFT calculations were made with
\emph{Gaussian09},\cite{g09} using an unrestricted Hartree-Fock
determinant as a reference for open-shell systems. All the CIPSI
calculations and range-separated CIPSI calculations were made with
\emph{Quantum Package}.\cite{Garniron_2019,qp2_2020}
Quantum Monte Carlo calculations were made with QMC=Chem,\cite{scemama_2013}
in the determinant localization approximation.\cite{Zen_2019}
In the determinant localization approximation, only the determinantal
component of the trial wave function is present in the expression of
the wave function on which the pseudopotential is localized. Hence,
the pseudopotential operator does not depend on the Jastrow factor, as
it is the case in all-electron calculations. This improves the
reproducibility of the results, as they depend only on parameters
optimized in a deterministic framework.
\section{Influence of the range-separation parameter on the fixed-node
error}
\label{sec:mu-dmc}
\begin{table}[h]
\caption{Fixed-node energies of the water molecule.}
\label{tab:h2o-dmc}
\centering
\begin{tabular}{crlrl}
\hline
& \multicolumn{2}{c}{BFD-VDZ} & \multicolumn{2}{c}{BFD-VTZ}\\
$\mu$ & $N_{\text{det}}$ & E(DMC) & $N_{\text{det}}$ & E(DMC)\\
\hline
$0.00$ & $11$ & $-17.253\,59(6)$ & $23$ & $-17.256\,74(7)$\\
$0.20$ & $23$ & $-17.253\,73(7)$ & $23$ & $-17.256\,73(8)$\\
$0.30$ & $53$ & $-17.253\,4(2)$ & $219$ & $-17.253\,7(5)$\\
$0.50$ & $1\,442$ & $-17.253\,9(2)$ & $16\,99$ & $-17.257\,7(2)$\\
$0.75$ & $3\,213$ & $-17.255\,1(2)$ & $13\,362$ & $-17.258\,4(3)$\\
$1.00$ & $6\,743$ & $-17.256\,6(2)$ & $256\,73$ & $-17.261\,0(2)$\\
$1.75$ & $54\,540$ & $-17.259\,5(3)$ & $207\,475$ & $-17.263\,5(2)$\\
$2.50$ & $51\,691$ & $-17.259\,4(3)$ & $858\,123$ & $-17.264\,3(3)$\\
$3.80$ & $103\,059$ & $-17.258\,7(3)$ & $1\,621\,513$ & $-17.263\,7(3)$\\
$5.70$ & $102\,599$ & $-17.257\,7(3)$ & $1\,629\,655$ & $-17.263\,2(3)$\\
$8.50$ & $101\,803$ & $-17.257\,3(3)$ & $1\,643\,301$ & $-17.263\,3(4)$\\
$\infty$ & $200\,521$ & $-17.256\,8(6)$ & $1\,631\,982$ & $-17.263\,9(3)$\\
\hline
\end{tabular}
\end{table}
\begin{figure}[h]
\centering
\includegraphics[width=\columnwidth]{h2o-dmc.pdf}
\caption{Fixed-node energies of the water molecule with variable
values of $\mu$.}
\label{fig:h2o-dmc}
\end{figure}
The water molecule was taken at the equilibrium
geometry,\cite{Caffarel_2016} and RSDFT-CIPSI wave functions were
generated with BFD pseudopotentials and the corresponding double-zeta
basis set using multiple values of the range-separation parameter
$\mu$. The convergence criterion for stopping the CIPSI calculation
was set to 1~m$E_h$ on the PT2 correction. Then, these wave functions
were used as trial wave functions for FN-DMC calculations, and the
corresponding energies are shown in table~\ref{tab:h2o-dmc} and
figure~\ref{fig:h2o-dmc}.
\section{Atomization energy benchmarks}
\label{sec:atomization}
Atomization energies are challenging for post-Hartree-Fock methods
because their calculation requires a perfect balance in the
description of atoms and molecules. Basis sets used in molecular
calculations are atom-centered, so they are always better adapted to
atoms than molecules and atomization energies usually tend to be
underestimated.
In the context of FN-DMC calculations, the nodal surface is imposed by
the trial wavefunction which is expanded on an atom-centered basis
set. So we expect the fixed-node error to be also related to the basis
set incompleteness error.
Increasing the size of the basis set improves the description of
the density and of electron correlation, but also reduces the
imbalance in the quality of the description of the atoms and the
molecule, leading to more accurate atomization energies.
Another important feature required to get accurate atomization
energies is size-extensivity, since the numbers of correlated electrons
in the isolated atoms are different from the number of correlated
electrons in the molecule.
In the context of selected CI calculations, when the variational energy is
extrapolated to the FCI energy\cite{Holmes_2017} there is obviously no
size-consistence error. But when the selected wave function is used
for as a reference for post-Hartree-Fock methods or QMC calculations,
there is a residual size-consistence error originating from the
truncation of the determinant space.
QMC calculations can be made size-consistent by extrapolating the
FN-DMC energy to estimate the energy obtained with the FCI as a trial
wave function.\cite{Scemama_2018,Scemama_2018b} Alternatively, the
size-consistence error can be reduced by choosing the number of
selected determinants such that the sum of the PT2 corrections on the
atoms is equal to the PT2 correction of the molecule, enforcing that
the variational dissociation potential energy surface (PES) is
parallel to the perturbatively corrected PES, which is an accurate
estimate of the FCI PES.\cite{Giner_2015}
Another source of size-consistence error in QMC calculation may originate
from the Jastrow factor. Usually, the Jastrow factor contains
one-electron, two-electron and one-nucleus-two-electron terms.
The problematic part is the two-electron term, whose simplest form can
be expressed as
\begin{equation}
J_\text{ee} = \sum_i \sum_{j<i} \frac{a r_{ij}}{1 + b r_{ij}}.
\end{equation}
$a$ is determined by cusp conditions, and $b$ is obtained by energy
or variance minimization.\cite{Coldwell_1977,Umrigar_2005}
One can easily see that this parameterization of the two-body
interation is not size-consistent. The dissociation of a
heteroatomic diatomic molecule $AB$ with a parameter $b_{AB}$
will lead to two different two-body Jastrow factors on each atom, each
with its own optimal value $b_A$ and $b_B$. To remove the
size-consistence error on a PES using this ansätz for $J_\text{ee}$,
one needs to impose that the parameters of $J_\text{ee}$ are fixed:
$b_A = b_B = b_{AB}$.
When pseudopotentials are used in a QMC calculation, it is common
practice to localize the pseudopotential on the complete wave
function. If the wave function is not size-consistent, so will be the
locality approximation. Recently, the determinant localization
approximation was introduced.\cite{Zen_2019} This approximation
consists in removing the Jastrow factor from the wave function on
which the pseudopotential is localized.
The great advantage of this approximation is that the FN-DMC energy
within this approximation only depends on the parameters of the
determinantal component. Using a size-inconsistent Jastrow factor, or
a non-optimal Jastrow factor will not introduce an additional
size-consistence error in FN-DMC calculations, although it will
reduce the statistical errors by reducing the variance of the local energy.
The energy computed within density functional theory is extensive, and
as it is a mean-field method the convergence to the complete basis set
(CBS) limit is relatively fast. Hence, DFT methods are very well adapted to
the calculation of atomization energies, especially with small basis
sets, but going to the CBS limit will converge to biased atomization
energies because of the use of approximate density functionals.
On the other hand, the convergence of the FCI energies to the CBS
limit will be slower because of the description of short-range electron
correlation with atom-centered functions, but ultimately the exact
energy will be reached.
The 55 molecules of the benchmark for the Gaussian-1
theory\cite{Pople_1989,Curtiss_1990} were chosen to test the quality
of the RSDFT-CIPSI trial wave functions for energy differences.
%%---------------------------------------
\begin{acknowledgments}
An award of computer time was provided by the Innovative and Novel
Computational Impact on Theory and Experiment (INCITE) program. This
research has used resources of the Argonne Leadership Computing
Facility, which is a DOE Office of Science User Facility supported
under Contract DE-AC02-06CH11357. AB, was supported by the
U.S. Department of Energy, Office of Science, Basic Energy Sciences,
Materials Sciences and Engineering Division, as part of the
Computational Materials Sciences Program and Center for Predictive
Simulation of Functional Materials.
\end{acknowledgments}
\bibliography{rsdft-cipsi-qmc}
\end{document}

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