More Green’s Functions, Equilibrium and Otherwise, and Their Applications
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The formalism we have developed so far is limited to zero temperature (i.e., to the ground state) properties of many-body systems. As you remember, this is because the ground state is always nondegenerate, so that we could pull off the trick with adiabatic hypothesis: if you slowly turn interactions on, and then off, the worst that can happen is some phase factor, which anyway cancels. This, in turn, allowed us to build up the diagrammatic technique.
KeywordsLinear Response Theory Quantum Point Contact Quantum Kinetic Equation Tunneling Matrix Element Cyclic Invariance
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