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Description:

Quantum oscillations provide a striking visualization of the Fermi surface of metals including associated geometrical phases, such as Berry’s phase, that play a central role in topological quantum materials. We report on magneto-transport measure- ments in ABA-trilayer graphene, the band structure of which is comprised of a weakly gapped monolayer graphene (MLG)-like band, nested within a trivial bilayer graphene (BLG)-like band. Detailed field and density maps, for a wide range of device param- eters, reveal Shubnikov-de Hass (SdH) oscillations of the BLG-like band shifted by a phase that sharply departs from the expected 2π Berry’s phase. A careful analysis reveals that, surprisingly, the anomalous shift is non-trivial and is inherited from the non-trivial Berry’s phase of the MLG-like band due to strong filling-enforced con- straints between the BLG-like and MLG-like Fermi surfaces. Given that many topo- logical materials contain multiple bands, our work indicates how additional bands, which are thought to obscure the analysis, can actually be exploited to tease out the subtle effects of Berry’s phase.

Rights:

• Creative Commons BY-NC Attribution-NonCommercial 4.0 International
  

Keyword: Quantum oscillations, trilayer graphene, Berry's phase

Date published: 2019-10-11

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

Journal:

• Science Advances (ISSN: 23752548) vol. 5 issue. 10

Funding:

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

MDR DOI:

First published URL: https://doi.org/10.1126/sciadv.aax6550

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Updated at: 2025-02-23 22:51:10 +0900

Published on MDR: 2025-02-23 22:51:10 +0900