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Rosa edited untitled.tex
about 8 years ago
Commit id: ac6f8e0217e793718ec6676c7ce67cea5d67502c
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F(t-t')=\frac{1}{2\pi}\int_{\infty}^\infty} d\omega e^{-i\omega t} F(\omega)\,,
\end{equation}
Then, the ac spectral noise becomes
\begin{eqnarray}
&&S^>(\omega)=\frac{e^2}{\hbar^2}\sum_{k\beta,q\gamma} \begin{multline}
S^>(\omega)=\frac{e^2}{\hbar^2}\sum_{k\beta,q\gamma} V_{\beta k} V_{\gamma q}^{*}\frac{1}{2\pi}\int_{-\infty}^\infty
d\omega e^{-i\omega (t-t')} \frac{1}{2\pi}\int_{-\infty}^\infty d\epsilon_1 e^{-i\epsilon (t-t')} \frac{1}{2\pi}\int_{-\infty}^\infty d\epsilon_2 e^{i\epsilon (t-t')}
&&\\ \nonumber \\
\Biggr\{
[G^t_{\beta\gamma}(\epsilon_1) G^{h,t}_{qk}(\epsilon_2) - G^{t}_{\beta q}(\epsilon_1)G^{h,t}_{\gamma
k}(\epsilon_2)]\\ \nonumber k}(\epsilon_2)]
\\
&& + V_{\beta k}^{*}V_{\gamma q} [G^{h,t}_{kq}(\epsilon_1) G{t}_{\gamma\beta}(\epsilon_2) - G^{h,t}_{k\gamma}(\epsilon_1)G^{t}_{q \beta}(\epsilon_2)]\Biggr\}\,,
\end{eqnarray} \end{multline}