Exact Green's Function and Fermi Surfaces from Conformal Gravity

TL;DR

This paper derives exact Green's functions for charged fermions in conformal gravity black holes, revealing detailed Fermi surface structures and finite-temperature effects in strongly interacting systems.

Contribution

It provides an exact analytic solution for the Dirac equation in conformal gravity backgrounds, enabling comprehensive analysis of Fermi surfaces at finite temperature.

Findings

Exact Green's functions obtained using Heun's functions.

Identification of Fermi and non-Fermi liquid behaviors.

Discovery of rich structures in Green's functions at finite temperature.

Abstract

We study the Dirac equation of a charged massless spinor on the general charged AdS black hole of conformal gravity. The equation can be solved exactly in terms of Heun's functions. We obtain the exact Green's function in the phase space (\omega,k). This allows us to obtain Fermi surfaces for both Fermi and non-Fermi liquids. Our analytic results provide a more elegant approach of studying some strongly interacting fermionic systems not only at zero temperature, but also at any finite temperature. At zero temperature, we analyse the motion of the poles in the complex \omega plane and obtain the leading order terms of the dispersion relation, expressed as the Laurent expansion of \omega in terms of k. We illustrate new distinguishing features arising at the finite temperature. The Green's function with vanishing \omega at finite temperature has a fascinating rich structure of spiked maxima in the plane of k and the fermion charge q.