Nontrivial quantum oscillation geometric phase shift in a trivial band

Datta, Biswajit ; Adak, Pratap Chandra ; Shi, Li-kun ; Watanabe, Kenji ; Taniguchi, Takashi ; Song, Justin C. W. ; Deshmukh, Mandar M. (2019) Nontrivial quantum oscillation geometric phase shift in a trivial band Science Advances, 5 (10). eaax6550. ISSN 2375-2548

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Quantum oscillations provide a notable 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. Here we report the existence of a new quantum oscillation phase shift in a multiband system. In particular, we study the ABA-trilayer graphene, the band structure of which is composed of a weakly gapped linear Dirac band, nested within a quadratic band. We observe that Shubnikov-de Haas (SdH) oscillations of the quadratic band are shifted by a phase that sharply departs from the expected 2π Berry’s phase and is inherited from the nontrivial Berry’s phase of the linear band. We find this arises due to an unusual filling enforced constraint between the quadratic band and linear band Fermi surfaces. Our work indicates how additional bands can be exploited to tease out the effect of often subtle quantum mechanical geometric phases.

Item Type:Article
Source:Copyright of this article belongs to American Association for the Advancement of Science.
ID Code:117620
Deposited On:28 Apr 2021 12:27
Last Modified:28 Apr 2021 12:27

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