# Field-induced quantum spin liquid in the Kitaev-Heisenberg model and its relation to $\alpha$-RuCl$_3$

## TL;DR

This study uses large-scale simulations to explore the field-induced quantum spin liquid phase in a model relevant to $ ext{RuCl}_3$, revealing a stable out-of-plane field-induced spin liquid connected to a spinon Fermi surface.

## Contribution

The paper demonstrates the existence of a stable out-of-plane field-induced spin liquid in a generalized Kitaev-Heisenberg model, clarifying its connection to spinon Fermi surfaces and relevance to $ ext{RuCl}_3$.

## Key findings

- Stable intermediate spin liquid phase induced by out-of-plane magnetic fields.
- No intermediate phase observed for in-plane magnetic fields.
- Connection between the field-induced spin liquid and a spinon Fermi surface.

## Abstract

Recently considerable excitement has arisen due to the experimental observation of a field-induced spin liquid phase in the compound $\alpha$-RuCl$_3$. However, the nature of this putative spin liquid phase and the relevant microscopic model Hamiltonian remain still unclear. In this work, we address these questions by performing large-scale numerical simulations of a generalized Kitaev-Heisenberg model proposed to describe the physics of $\alpha$-RuCl$_3$. While there is no evidence for an intermediate phase for in-plane magnetic fields, our results strongly suggest that a stable intermediate spin liquid phase, sandwiched between a magnetically ordered phase at low fields and a high-field polarized phase, can be induced by out-of-plane magnetic fields. Moreover, we show that this field-induced spin liquid phase can be smoothly connected to a spin liquid possessing a spinon Fermi surface as proposed recently for the Kitaev model. The relevance of our results to $\alpha$-RuCl$_3$ is also discussed.