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Anomalous exciton transport in response to a uniform in-plane electric field

Chaudhary, Swati and Knapp, Christina and Refael, Gil (2021) Anomalous exciton transport in response to a uniform in-plane electric field. Physical Review B, 103 (16). Art. No. 165119. ISSN 2469-9950. doi:10.1103/PhysRevB.103.165119.

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Excitons are neutral objects that, naively, should have no response to a uniform electric field. Could the Berry curvature of the underlying electronic bands alter this conclusion? In this work, we show that Berry curvature can indeed lead to anomalous transport for excitons in two-dimensional materials subject to a uniform in-plane electric field. By considering the constituent electron and hole dynamics, we demonstrate that there exists a regime for which the corresponding anomalous velocities are in the same direction. We establish the resulting center-of-mass motion of the exciton through both a semiclassical and fully quantum mechanical analysis, and elucidate the critical role of Bloch oscillations in achieving this effect. We identify transition metal dichalcogenide heterobilayers as candidate materials to observe the effect.

Item Type:Article
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URLURL TypeDescription Paper
Knapp, Christina0000-0002-5982-8107
Additional Information:© 2021 American Physical Society. Received 2 October 2020; revised 9 March 2021; accepted 7 April 2021; published 16 April 2021. We are grateful to Felix von Oppen and Michael Fogler for stimulating conversations. This work was supported by the Institute of Quantum Information and Matter, an NSF Frontier center funded by the Gordon and Betty Moore Foundation, the Packard Foundation, and the Simons Foundation. S.C. and G.R. thank the U.S. Department of Energy, Office of Science, Basic Energy Sciences under Award No. de-sc0019166. G.R. is also grateful for the NSF DMR Grant No. 1839271. NSF and DOE supported G.R.'s time commitment to the project in equal shares. C.K. acknowledges support from the Walter Burke Institute for Theoretical Physics at Caltech.
Group:Institute for Quantum Information and Matter, Walter Burke Institute for Theoretical Physics
Funding AgencyGrant Number
Institute of Quantum Information and Matter (IQIM)UNSPECIFIED
Gordon and Betty Moore FoundationUNSPECIFIED
David and Lucile Packard FoundationUNSPECIFIED
Simons FoundationUNSPECIFIED
Department of Energy (DOE)DE-SC0019166
Walter Burke Institute for Theoretical Physics, CaltechUNSPECIFIED
Issue or Number:16
Record Number:CaltechAUTHORS:20201111-135554466
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:106629
Deposited By: Tony Diaz
Deposited On:11 Nov 2020 22:11
Last Modified:21 Apr 2021 16:54

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