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Pseudogauge field driven acoustoelectric current in two-dimensional hexagonal Dirac materials
Nordita SU; Stockholm Univ, Hannes Alfvens Vag 12, S-10691 Stockholm, Sweden..
Univ Missouri, Dept Phys & Astron, Columbia, MO 65211 USA..
Nordita SU;Stockholm Univ, Hannes Alfvens Vag 12, S-10691 Stockholm, Sweden..ORCID iD: 0000-0002-9521-1008
2022 (English)In: Physical Review B, ISSN 2469-9950, E-ISSN 2469-9969, Vol. 105, no 12, article id 125407Article in journal (Refereed) Published
Abstract [en]

Using a diagrammatic scheme, we study the acoustoelectric effects in two-dimensional (2D) hexagonal Dirac materials due to the sound-induced pseudogauge field. We analyze both uniform and spatially dispersive currents in response to copropagating and counterpropagating sound waves, respectively. In addition to the longitudinal acoustoelectric current, we obtain an exotic transverse charge current flowing perpendicular to the sound propagation direction owing to the interplay of transverse and longitudinal gauge field components j(T) proportional to A(L)A(T)*. In contrast to the almost isotropic directional profile of the longitudinal uniform current, a highly anisotropic transverse component j(T) similar to sin(6 theta) is achieved that stems from the inherited threefold symmetry of the hexagonal lattice. However, both longitudinal and transverse parts of the dispersive current are predicted to be strongly anisotropic similar to sin(2)(theta) or cos(2)(3 theta). We quantitatively estimate the pseudogauge field contribution to the acoustoelectric current that can be probed in future experiments in graphene and other 2D hexagonal Dirac materials.

Place, publisher, year, edition, pages
American Physical Society (APS) , 2022. Vol. 105, no 12, article id 125407
National Category
Condensed Matter Physics
Identifiers
URN: urn:nbn:se:kth:diva-310770DOI: 10.1103/PhysRevB.105.125407ISI: 000771483700003Scopus ID: 2-s2.0-85126441231OAI: oai:DiVA.org:kth-310770DiVA, id: diva2:1650483
Note

QC 20220407

Available from: 2022-04-07 Created: 2022-04-07 Last updated: 2023-09-25Bibliographically approved

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CiteExportLink to record
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