Nontrivial quantum oscillation geometric phase shift in a trivial band
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 sys...
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sg-ntu-dr.10356-1439392023-02-28T19:52:19Z Nontrivial quantum oscillation geometric phase shift in a trivial band Datta, Biswajit Adak, Pratap Chandra Shi, Li-kun Watanabe, Kenji Taniguchi, Takashi Song, Justin Chien Wen Deshmukh, Mandar M. School of Physical and Mathematical Sciences Institute of High Performance Computing, A*STAR Physics - Mesoscopic Systems and Quantum Hall Effect Physics - Mesoscopic Systems and Quantum Hall Effect Quantum Oscillation Trivial Band 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. National Research Foundation (NRF) Published version 2020-10-02T02:29:32Z 2020-10-02T02:29:32Z 2019 Journal Article 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 2375-2548 https://hdl.handle.net/10356/143939 10.1126/sciadv.aax6550 31667347 10 5 eaax6550 en Science Advances © 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). application/pdf |
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Physics - Mesoscopic Systems and Quantum Hall Effect Physics - Mesoscopic Systems and Quantum Hall Effect Quantum Oscillation Trivial Band Datta, Biswajit Adak, Pratap Chandra Shi, Li-kun Watanabe, Kenji Taniguchi, Takashi Song, Justin Chien Wen Deshmukh, Mandar M. Nontrivial quantum oscillation geometric phase shift in a trivial band |
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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. |
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School of Physical and Mathematical Sciences |
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School of Physical and Mathematical Sciences Datta, Biswajit Adak, Pratap Chandra Shi, Li-kun Watanabe, Kenji Taniguchi, Takashi Song, Justin Chien Wen Deshmukh, Mandar M. |
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Article |
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Datta, Biswajit Adak, Pratap Chandra Shi, Li-kun Watanabe, Kenji Taniguchi, Takashi Song, Justin Chien Wen Deshmukh, Mandar M. |
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Datta, Biswajit |
title |
Nontrivial quantum oscillation geometric phase shift in a trivial band |
title_short |
Nontrivial quantum oscillation geometric phase shift in a trivial band |
title_full |
Nontrivial quantum oscillation geometric phase shift in a trivial band |
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Nontrivial quantum oscillation geometric phase shift in a trivial band |
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Nontrivial quantum oscillation geometric phase shift in a trivial band |
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nontrivial quantum oscillation geometric phase shift in a trivial band |
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2020 |
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https://hdl.handle.net/10356/143939 |
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1759858314043195392 |