SKM 2023 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 61: Focus Session: Correlations in Moiré Quantum Matter II
TT 61.3: Vortrag
Donnerstag, 30. März 2023, 18:15–18:30, HSZ 201
Tunable topological order of pseudo spins in semiconductor heterostructures — Clemens Kuhlenkamp1,2,3, •Wilhelm Kadow1,2, Atac Imamoglu3, and Michael Knap1,2 — 1Department of Physics, Technical University of Munich, 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 a novel platform to realize highly-tunable, frustrated Hubbard physics with topological order in multi-layer Moiré structures. 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 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 spin liquid phases which are induced by the magnetic field. 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. We also discuss how layer pseudo-spin can be probed in near-term experiments.