Fledgling quantum spin Hall effect in pseudo gap phase of Bi2212

TL;DR

This paper investigates the potential emergence of quantum spin Hall states in the pseudo-gap phase of Bi2212, highlighting the role of strong spin-orbit coupling and chiral density wave order in inducing topological phenomena.

Contribution

It introduces a model combining Rashba spin-orbit coupling with a chiral density wave order to predict quantum spin Hall effects in Bi2212's pseudo-gap phase, a novel theoretical insight.

Findings

Strong SOC induces spin-momentum locking.

Quantum anomalous Hall effect is possible with TRS breaking.

Topological states can be tuned by electric field.

Abstract

We study the emergence of the quantum spin Hall (QSH) states for the pseudo-gap (PG) phase of Bi2212 bilayer system, assumed to be D-density wave(DDW) ordered, starting with a strong Rashba spin-orbit coupling(SOC) armed, and the time reversal symmetry (TRS) complaint Bloch Hamiltonian. The presence of strong SOC gives rise to non-trivial, spin-momentum locked spin texture tunable by electric field. The emergence of quantum anomalous Hall effect with TRS broken Chiral DDW Hamiltonian of Das Sarma et al. is found to be possible.