21- Matsubara formalism - Course on Quantum Many-Body Physics
Welcome to the course on Quantum Theory of Many-Body systems in Condensed Matter at the Institute of Physics - University of Sao Paulo (IF-USP). In this class, we will cover: Imaginary-time evolution of operators. Imaginary-time ordered Green’s functions. Feynman diagrams for Matsubara Green’s functions. Sum over Matsubara frequencies.

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23- Phonon Green's functions - Course on Quantum Many-Body Physics

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