Please use this identifier to cite or link to this item: https://hdl.handle.net/10356/143939
Title: Nontrivial quantum oscillation geometric phase shift in a trivial band
Authors: Datta, Biswajit
Adak, Pratap Chandra
Shi, Li-kun
Watanabe, Kenji
Taniguchi, Takashi
Song, Justin Chien Wen
Deshmukh, Mandar M.
Keywords: Physics - Mesoscopic Systems and Quantum Hall Effect
Physics - Mesoscopic Systems and Quantum Hall Effect
Issue Date: 2019
Source: Datta, B., Adak, P. C., Shi, L.-k., Watanabe, K., Taniguchi, T., Song, J. C. W., & Deshmukh, M. M. (2019). Nontrivial quantum oscillation geometric phase shift in a trivial band. Science Advances, 5(10), eaax6550-. doi:10.1126/sciadv.aax6550
Journal: Science Advances
Abstract: 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.
URI: https://hdl.handle.net/10356/143939
ISSN: 2375-2548
DOI: 10.1126/sciadv.aax6550
Rights: © 2019 The Authors, some rights reserved; exclusive licensee American Association for the Advancement of Science. No claim to original U.S. Government Works. Distributed under a Creative Commons Attribution NonCommercial License 4.0 (CC BY-NC).
Fulltext Permission: open
Fulltext Availability: With Fulltext
Appears in Collections:SPMS Journal Articles

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