Layer Pseudospin Magnetism in Transition-Metal-Dichalcogenide Double-Moir\'es

TL;DR

This paper predicts the emergence of layer pseudospin order in double-moiré strongly correlated 2D electron systems, drawing parallels with quantum Hall systems and discussing implications for electronic ferroelectricity.

Contribution

It introduces the concept of layer pseudospin magnetism in double-moiré systems, expanding understanding of correlated electron phenomena in 2D materials.

Findings

Layer pseudospin order is predicted to occur in double-moiré systems.

Comparison of pseudospin order in quantum Hall and double-moiré systems.

Relation of findings to electronic ferroelectric models.

Abstract

Spontaneous order of layer pseudospins in two-dimensional bilayers is common in quantum Hall systems, where it is responsible for hysteretic responses to gate fields in states with Ising order, and giant drag voltages in states with XY (spontaneous inter-layer phase coherence) order. In this article we predict that layer pseudospin order will also occur in double-moir\'e strongly correlated two-dimensional electron systems. We comment on similarities and differences in the competition between the two types of order in quantum Hall and double-moir\'e systems, and relate our findings to previous work on Falicov-Kimball models of electronic ferroelectrics.