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- W2949214026 abstract "We consider the interaction-driven Mott transition at zero temperature from the viewpoint of microscopic Fermi liquid theory. To this end, we derive an exact expression for the Landau parameters within the dynamical mean-field theory (DMFT) approximation to the single-band Hubbard model. At the Mott transition the symmetric and the anti-symmetric Landau parameter diverge. The vanishing compressibility at the Mott transition directly implies the divergence of the forward scattering amplitude in the charge sector, which connects the proximity of the Mott phase to a tendency towards phase separation. We verify the expected behavior of the Landau parameters in a DMFT application to the Hubbard model on the triangular lattice at finite temperature. Exact conservation laws and the Ward identity are crucial to capture vertex divergences related to the Mott transition. We furthermore generalize Leggett's formula for the static susceptibility of the Fermi liquid to the static fermion-boson response function. In the charge sector the limits of small transferred momentum and frequency of this response function commute at the Mott transition." @default.
- W2949214026 created "2019-06-27" @default.
- W2949214026 creator A5042161773 @default.
- W2949214026 creator A5049179427 @default.
- W2949214026 creator A5052554493 @default.
- W2949214026 creator A5057489212 @default.
- W2949214026 creator A5072510071 @default.
- W2949214026 date "2019-06-13" @default.
- W2949214026 modified "2023-10-03" @default.
- W2949214026 title "Two-particle Fermi liquid parameters at the Mott transition: Vertex divergences, Landau parameters, and incoherent response in dynamical mean-field theory" @default.
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