new fig with Hugh style
This commit is contained in:
parent
42ad66c614
commit
ee9d970d0e
@ -1286,7 +1286,6 @@ and substituting $E(\lambda$) by its $n$th-order expansion and the polynomials b
|
||||
A quadratic approximant, characterised by the label $[d_P/d_Q,d_R]$, generates, by construction, $n_\text{bp} = \max(2d_p,d_q+d_r)$ branch points at the roots of the polynomial $P^2(\lambda) - 4 Q(\lambda) R(\lambda)$.
|
||||
The diagonal sequence of quadratic approximant, \ie, $[0/0,0]$, $[1/0,0]$, $[1/0,1]$, $[1/1,1]$, $[2/1,1]$, is of particular interest.
|
||||
Note that, by construction, a quadratic approximant has only two branches which hampers the faithful description of more complicated singularity structures.
|
||||
|
||||
As shown in Ref.~\onlinecite{Goodson_2000}, quadratic approximants provide convergent results in the most divergent cases considered by Olsen and collaborators \cite{Christiansen_1996,Olsen_1996} and Leininger \etal \cite{Leininger_2000}
|
||||
|
||||
For the RMP series of the Hubbard dimer, the $[0/0,0]$ and $[1/0,0]$ quadratic approximant are quite poor approximation, but its $[1/0,1]$ version already model perfectly the RMP energy function by predicting a single pair of EPs at $\lambda_\text{EP} = \pm i 4t/U$.
|
||||
|
Binary file not shown.
Loading…
Reference in New Issue
Block a user