Folkert K. de Vries
;
Sergey Slizovskiy
;
Petar Tomić
;
Roshan Krishna Kumar
;
Aitor Garcia-Ruiz
;
Giulia Zheng
;
Elías Portolés
;
Leonid A. Ponomarenko
;
Andre K. Geim
;
Kenji Watanabe
(National Institute for Materials Science)
;
Takashi Taniguchi
(National Institute for Materials Science)
;
Vladimir Fal’ko
;
Klaus Ensslin
;
Thomas Ihn
;
Peter Rickhaus
Collection
Citation
Description:
(abstract)Periodic systems feature the Hofstadter butterfly spectrum produced by Brown– Zak minibands of electrons formed when magnetic field flux through the lat- tice unit cell is commensurate with flux quantum and manifested by magneto- transport oscillations. Quantum oscillations, such as Shubnikov – de Haas effect and Aharonov–Bohm effect, are also characteristic for electronic sys- tems with closed orbits in real space and reciprocal space. Here we show the intricate relation between these two phenomena by tracing quantum magneto-oscillations to Lifshitz transitions in graphene superlattices, where they persist even at relatively low fields and very much above liquid-helium temperatures. The oscillations originate from Aharonov–Bohm interference on cyclotron tra- jectories that form a kagomé-shaped network characteristic for Lifshitz tran- sitions. In contrast to Shubnikov - de Haas oscillations, the kagomé oscillations are robust against thermal smearing and they can be detected even when the Hofstadter butterfly spectrum is undermined by electron’s scattering. We expect that kagome ́ quantum oscillations are generic to rotationally-symmetric two-dimensional crystals close to Lifshitz transitions.
Rights:
Keyword: Magneto-oscillations, Lifshitz transitions, graphene
Date published: 2024-01-17
Publisher: American Chemical Society (ACS)
Journal:
- Nano Letters (ISSN: 15306984) vol. 24 issue. 2 p. 601-606
Funding:
- Engineering and Physical Sciences Research Council EP/W006502/1
- Engineering and Physical Sciences Research Council EP/S030719/1
- Engineering and Physical Sciences Research Council EP/V007033/1
- National Center of Competence in Research Quantum Science and Technology
- Horizon 2020 Framework Programme 862660
- Graphene Flagship
- H2020 European Research Council 951541
Manuscript type: Publisher's version (Version of record)
MDR DOI:
First published URL: https://doi.org/10.1021/acs.nanolett.3c03524
Related item:
Other identifier(s):
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Updated at: 2025-02-14 16:31:22 +0900
Published on MDR: 2025-02-14 16:31:22 +0900
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