Exact Green's Function and Fermi Surfaces from Conformal Gravity

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 (ω,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 ωplane and obtain the leading order terms of the dispersion relation, expressed as the Laurent expansion of ωin terms of k. We illustrate new distinguishing features arising at the finite temperature. The Green's function with vanishing ωat finite temperature has a fascinating rich structure of spiked maxima in the plane of k and the fermion charge q.

12 pages, typos corrected, further discussions on the properties of the Green's function and dispersion relation, new figures of the motion of poles added. Version to appear in Phys. Lett. B