Berlin 2024 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 44: Twisted Materials / Systems
TT 44.3: Vortrag
Mittwoch, 20. März 2024, 12:00–12:15, H 3007
Chiral Pseudo Spin Liquids in Tunable Moire Heterostructures — Clemens Kuhlenkamp1,2,3, Wilhelm Kadow1,2, Atac Imamoglu3, and •Michael Knap1,2 — 1Technical University of Munich, TUM School of Natural Sciences, Physics Department, 85748 Garching, Germany — 2Munich Center for Quantum Science and Technology (MCQST), Schellingstr. 4, D-80799 München, Germany — 3Institute for Quantum Electronics, ETH Zürich, CH-8093 Zürich, Switzerland
We propose multi-layer moiré structures in strong external magnetic fields as a novel platform for realizing highly-tunable, frustrated Hubbard physics with topological order. Identifying a layer degree of freedom as a pseudo spin, 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 exceptionally stable chiral pseudo spin liquid phases which are induced by the magnetic field. We discuss how layer pseudo-spin can be probed in near-term experiments. As the magnetic flux can be easily tuned in moiré systems, our approach provides a promising route towards the experimental realization and control of topologically ordered phases of matter.
Keywords: Chiral Spin Liquids; Fractional Quantum Hall Effect; Topological order; DMRG; Transition Metal Dichalcogenides