Chiral Pseudospin Liquids in Moiré Heterostructures

Clemens Kuhlenkamp, Wilhelm Kadow, Ataç Imamoǧlu, Michael Knap

Research output: Contribution to journalArticlepeer-review

1 Scopus citations

Abstract

We propose multilayer moiré structures in strong external magnetic fields as a novel platform for realizing highly tunable, frustrated Hubbard physics with topological order. Identifying the layer degree of freedom as a pseudospin allows us to retain SU(2) symmetry while controlling ring-exchange processes and concurrently quenching the kinetic energy by large external magnetic fields. This way, a broad class of interacting Hubbard-Hofstadter states and their transitions can be studied. Remarkably, in the limit of strong interactions the system becomes Mott insulating and we find chiral pseudospin-liquid phases which are induced by the magnetic field. We find that this topologically ordered state remains exceptionally stable toward relevant perturbations. We discuss how layer pseudospin can be probed in near-term experiments. As the magnetic flux can be easily tuned in moiré systems, our approach provides a promising route toward the experimental realization and control of topologically ordered phases of matter.

Original languageEnglish
Article number021013
JournalPhysical Review X
Volume14
Issue number2
DOIs
StatePublished - Apr 2024

Fingerprint

Dive into the research topics of 'Chiral Pseudospin Liquids in Moiré Heterostructures'. Together they form a unique fingerprint.

Cite this