A Possible Fermi liquid in the lightly doped Kitaev spin liquid

TL;DR

This paper demonstrates that lightly doped Kitaev spin liquids form a Fermi liquid with a well-defined Fermi surface, quasiparticles, and distinctive transport properties, suggesting experimental detection in doped iridates.

Contribution

It reveals that lightly doped Kitaev spin liquids exhibit Fermi liquid behavior with a Fermi surface consistent with Luttinger's theorem, a novel insight into doped quantum spin liquids.

Findings

Presence of a closed Fermi surface around the Brillouin zone center.

Well-defined quasiparticles near the Fermi surface.

Violation of the Wiedemann-Franz law and large Wilson ratio.

Abstract

In this paper, we study the lightly doped Kitaev spin liquid (DKSL) and find it to be a Fermi liquid state. The DKSL has a closed Fermi surface around the center of the Brillouin zone with the quantized volume determined by the Luttinger's theorem. It has well-defined quasiparticles near the Fermi surface and can be detected in the angle-resolved photoemission spectroscopy. The DKSL has the topological Kitaev spin liquid (KSL) as its neutral background. It violates the Wiedemann-Franz law and has a large Wilson ration. These results has the potential experimental test in the iridates upon doping.