An all-electronic FRG with retarded phonon-mediated interactions treats charge, spin, nematic, and pairing instabilities on equal footing and is illustrated for the square-lattice Hubbard model with acoustic phonons.
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A group-theory approach labels BSE excitons with irreducible representations and total crystal angular momentum to derive selection rules and conservation laws, demonstrated in three materials.
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Electron-Phonon Functional Renormalization Group of Fermi Liquid Instabilities
An all-electronic FRG with retarded phonon-mediated interactions treats charge, spin, nematic, and pairing instabilities on equal footing and is illustrated for the square-lattice Hubbard model with acoustic phonons.
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Symmetries of excitons
A group-theory approach labels BSE excitons with irreducible representations and total crystal angular momentum to derive selection rules and conservation laws, demonstrated in three materials.