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The study of physical properties of condensed phases of matter, including solids and liquids.

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How to compute $\chi_1$, a Lorentzian absorption in the following paper?

I have the following paper: https://arxiv.org/abs/1508.01213 on the third page, where they take: $$\chi_2(\omega)= \frac{-k\gamma}{(\omega-\omega_0)^2+\gamma^2},$$ I don't see how to explicitly comput …
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A question on the transition matrix. (algebraic derivation)

I am trying to follow the derivation of the following identity: $$[\epsilon -H_0+i\eta]^{-1}T = [\epsilon - H +i\eta]^{-1}U$$ where $T$ is the transition matrix and $U$ is the potential caused by th …
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