diff --git a/Slides/SRG-GF.tex b/Slides/SRG-GF.tex index 589eb50..a7add42 100644 --- a/Slides/SRG-GF.tex +++ b/Slides/SRG-GF.tex @@ -124,39 +124,40 @@ }_{\bHod(s)} \end{equation} \end{block} - % \begin{block}{Components of the Hamiltonian} - \begin{subequations} - \begin{align} - \bH(s) & = \bH^{(0)}(s) + \la \bH^{(1)}(s) + \la^2 \bH^{(2)}(s) + \cdots - \\ - \bC(s) & = \bC^{(0)}(s) + \la \bC^{(1)}(s) + \la^2 \bC^{(2)}(s) + \cdots - \\ - \bV(s) & = \bV^{(0)}(s) + \la \bV^{(1)}(s) + \la^2 \bV^{(2)}(s) + \cdots - \end{align} - \end{subequations} + \begin{subequations} + \begin{align} + \bH(s) & = \bH^{(0)}(s) + \la \bH^{(1)}(s) + \la^2 \bH^{(2)}(s) + \cdots + \\ + \bF(s) &= \bF^{(0)}(s) + \la \bF^{(1)}(s) + \la^2 \bF^{(2)}(s) + \cdots + \\ + \bC(s) & = \bC^{(0)}(s) + \la \bC^{(1)}(s) + \la^2 \bC^{(2)}(s) + \cdots + \\ + \bV(s) & = \bV^{(0)}(s) + \la \bV^{(1)}(s) + \la^2 \bV^{(2)}(s) + \cdots + \end{align} + \end{subequations} \end{block} \begin{block}{Wegner generator} - \begin{equation} - \bEta(s) - = \comm{\bHd(s)}{\bHod(s)} - = \bEta^{(0)}(s) + \la \bEta^{(1)}(s) + \la^2 \bEta^{(2)}(s) + \cdots - \end{equation} + \begin{equation} + \bEta(s) + = \comm{\bHd(s)}{\bHod(s)} + = \bEta^{(0)}(s) + \la \bEta^{(1)}(s) + \la^2 \bEta^{(2)}(s) + \cdots + \end{equation} \end{block} \end{frame} %----------------------------------------------------- %----------------------------------------------------- \begin{frame}{Zeroth-Order Terms} - \begin{block}{Wegner generator} - \begin{equation} - \bEta^{(0)}(s) - = \comm{\bHd^{(0)}(s)}{\bHod^{(0)}(s)} - = \bO - \qq{because} - \bHod^{(0)}(s) = \bO - \end{equation} - \end{block} + \begin{block}{Wegner generator} + \begin{equation} + \bEta^{(0)}(s) + = \comm{\bHd^{(0)}(s)}{\bHod^{(0)}(s)} + = \bO + \qq{because} + \bHod^{(0)}(s) = \bO + \end{equation} + \end{block} % \begin{block}{Zeroth-order Hamiltonian} \begin{equation} @@ -220,16 +221,16 @@ \begin{block}{Diagonal terms} \begin{equation} \dv{\bF^{(1)}}{s} = \bO - \land - \bF^{(1)}(0) = \bO - \Rightarrow + \Leftrightarrow + \bF^{(1)}(s) = \bF^{(1)}(0) + \Leftrightarrow \boxed{\bF^{(1)}(s) = \bO} \end{equation} \begin{equation} - \dv{\bC^{(1)}}{s} - \land - \bC^{(1)}(0) = \bO - \Rightarrow + \dv{\bC^{(1)}}{s} = \bO + \Leftrightarrow + \bC^{(1)}(s) = \bC^{(1)}(0) + \Leftrightarrow \boxed{\bC^{(1)}(s) = \bO} \end{equation} \end{block} @@ -308,16 +309,8 @@ - 2 \bV^{(1)} \bC^{(0)} \bV^{(1),\dag} \\ \Rightarrow - F_{pq}^{(2)}(s) = \sum_{(r,v)} \frac{\Delta_p^{(r,v)} + \Delta_q^{(r,v)}}{(\Delta_p^{(r,v)})^2 + (\Delta_q^{(r,v)})^2 } W_{p,(r,v)}^{(1)}(0)W_{q,(r,v)}^{(1)}(0)\qty(1-e^{-(\Delta_{p}^{(r,v)})^2s} e^{-(\Delta_{q}^{(r,v)})^2s}) - \end{gather} - \begin{gather} - \dv{\bC^{(2)}}{s} - = \bC^{(0)} \bV^{(1)} \bV^{(1),\dag} - + \bV^{(1)} \bV^{(1),\dag} \bC^{(0)} - - 2 \bV^{(1)} \bF^{(0)} \bV^{(1),\dag} - \\ - \Rightarrow - C_{(r,v),(s,t)}^{(2)}(s) = \sum_{p} \frac{-\Delta_p^{(r,v)} - \Delta_p^{(s,t)}}{(\Delta_p^{(r,v)})^2 + (\Delta_p^{(s,t)})^2 } W_{p,(r,v)}^{(1)}(0)W_{p,(s,t)}^{(1)}(0)\qty(1-e^{-(\Delta_{p}^{(r,v)})^2s} e^{-(\Delta_{p}^{(s,t)})^2s}) + F_{pq}^{(2)}(s) = \sum_{(r,v)} \frac{\Delta_p^{(r,v)} + \Delta_q^{(r,v)}}{(\Delta_p^{(r,v)})^2 + (\Delta_q^{(r,v)})^2 } W_{p,(r,v)}^{(1)}(0)W_{q,(r,v)}^{(1)}(0)\qty(1-e^{-(\Delta_{p}^{(r,v)})^2s} e^{-(\Delta_{q}^{(r,v)})^2s}) \\ + \qq{with} \Delta_{q}^{(r,v)} = \epsilon_q - \epsilon_r \pm \Omega_v \notag \end{gather} \end{block} \begin{block}{Off-diagonal terms} @@ -358,6 +351,21 @@ \end{block} \end{frame} +%----------------------------------------------------- +\begin{frame}{Integration of the Second-Order Terms} + \begin{block}{Diagonal terms} + \begin{gather} + \dv{\bC^{(2)}}{s} + = \bC^{(0)} \bV^{(1)} \bV^{(1),\dag} + + \bV^{(1)} \bV^{(1),\dag} \bC^{(0)} + - 2 \bV^{(1)} \bF^{(0)} \bV^{(1),\dag} + \\ + \Rightarrow + C_{(r,v),(s,t)}^{(2)}(s) = \sum_{p} \frac{-\Delta_p^{(r,v)} - \Delta_p^{(s,t)}}{(\Delta_p^{(r,v)})^2 + (\Delta_p^{(s,t)})^2 } W_{p,(r,v)}^{(1)}(0)W_{p,(s,t)}^{(1)}(0)\qty(1-e^{-(\Delta_{p}^{(r,v)})^2s} e^{-(\Delta_{p}^{(s,t)})^2s}) + \end{gather} + \end{block} +\end{frame} + %-----------------------------------------------------