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Gate-tunable quantum acoustoelectric transport in graphene
- Source :
- Nano Letters 24(15), 4625-4632 (2024)
- Publication Year :
- 2024
-
Abstract
- Transport probes the motion of quasiparticles in response to external excitations. Apart from the well-known electric and thermoelectric transport, acoustoelectric transport induced by traveling acoustic waves has been rarely explored. Here, by adopting a hybrid nanodevices integrated with piezoelectric substrates, we establish a simple design of acoustoelectric transport with gate tunability. We fabricate dual-gated acoustoelectric devices based on BN-encapsuled graphene on LiNbO3. Longitudinal and transverse acoustoelectric voltages are generated by launching pulsed surface acoustic wave. The gate dependence of zero-field longitudinal acoustoelectric signal presents strikingly similar profiles as that of Hall resistivity, providing a valid approach for extracting carrier density without magnetic field. In magnetic fields, acoustoelectric quantum oscillations appear due to Landau quantization, which are more robust and pronounced than Shubnikov-de Haas oscillations. Our work demonstrates a feasible acoustoelectric setup with gate tunability, which can be extended to the broad scope of various Van der Waals materials.<br />Comment: 16 pages, 5 figures
Details
- Database :
- arXiv
- Journal :
- Nano Letters 24(15), 4625-4632 (2024)
- Publication Type :
- Report
- Accession number :
- edsarx.2403.20248
- Document Type :
- Working Paper
- Full Text :
- https://doi.org/10.1021/acs.nanolett.4c00774