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By introducing first-order quantum phases as topological invariants, recent symmetry-analysis based theories have reinvigorated magnetic quantum oscillations as a versatile quantum probe for unfolding the Fermi-surface topology along with the geometry information, i.e. topo-Fermiology. Here, we demon- strate the comprehensive topo-Fermiology of high mobility Rashba 2D electron gases with ultra gate-tunability of spin-orbit coupling parameters in few- layer black arsenic. The remarkable consistencies with the key theoretical predictions of period doubling in quantum oscillations, gate-tunable aperiodic beating patterns, and the symmetry enforced Landau level crossing phenomena controlled by the competition between Rashba coupling and the Zeeman interaction, which ultimately manifests as all odd-filling factor integer quantum Hall effect with superb sensitivity to quantum phases, establish topo- Fermiology as an indispensable methodology for studying topological quantum matters.

Rights:

• Creative Commons BY-NC Attribution-NonCommercial 4.0 International
  

Keyword: Quantum phases, topological invariants, Rashba 2DEGs

Date published: 2024-11-22

Publisher: American Association for the Advancement of Science (AAAS)

Journal:

• Science Advances (ISSN: 23752548) vol. 10 issue. 47 eadp8208

Funding:

Manuscript type: Publisher's version (Version of record)

MDR DOI:

First published URL: https://doi.org/10.1126/sciadv.adp8208

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Updated at: 2025-02-23 22:46:38 +0900

Published on MDR: 2025-02-23 22:46:38 +0900