Spin Charge Separation in the Quantum Spin Hall State

TL;DR

This paper demonstrates that the quantum spin Hall state inherently causes spin-charge separation when a π flux is present, a phenomenon valid for interacting systems, and proposes an experimental observation method.

Contribution

It establishes the universal occurrence of spin-charge separation in quantum spin Hall states with π flux and suggests an experimental approach to observe this effect.

Findings

Spin-charge separation occurs in quantum spin Hall states with π flux.

The phenomenon is valid for any interacting system.

An experimental proposal for observing spin-charge separation is provided.

Abstract

The quantum spin Hall state is a topologically non-trivial insulator state protected by the time reversal symmetry. We show that such a state always leads to spin-charge separation in the presence of a $\pi$ flux. Our result is generally valid for any interacting system. We present a proposal to experimentally observe the phenomenon of spin-charge separation in the recently discovered quantum spin Hall system.