A Novel Meron-induced Pseudospin Wave in Bilayer Quantum Hall Coherent State and the Residual Zero-bias Peak in Tunneling Conductance

TL;DR

This paper predicts a new pseudospin wave caused by meron pairs in bilayer quantum Hall states, explaining the persistent zero-bias conductance peak observed experimentally.

Contribution

It introduces a novel meron-induced pseudospin wave mechanism that accounts for the residual zero-bias peak in tunneling conductance.

Findings

Identification of a meron-induced pseudospin wave.

Explanation of the residual zero-bias conductance peak.

Distinction between low and high bias voltage behaviors.

Abstract

In the bilayer quantum Hall coherent state for $\nu_T$ deviating slightly from one, we show that, instead of the global order parameter, the spontaneous breaking of the pseudospin U(1) rotational symmetry is reflected by the periodic domain structure accompanying with the charged meron pairs. The motion of meron pairs induces a novel pseudospin wave. The long range order of the periodic domains in a low bias voltage range leads to the residual zero-bias peak in the tunneling conductance even when the pseudopsin Goldstone feature in a high bias voltage range can be distinct from it.