Microwave response of interacting oxide two-dimensional electron systems
Abstract
We present an experimental study on microwave illuminated high mobility MgZnO/ZnO based two-dimensional electron systems with different electron densities and, hence, varying Coulomb interaction strength. The photoresponse of the low-temperature dc resistance in perpendicular magnetic field is examined in low and high density samples over a broad range of illumination frequencies. In low density samples a response due to cyclotron resonance (CR) absorption dominates, while high-density samples exhibit pronounced microwave-induced resistance oscillations (MIRO). Microwave transmission experiments serve as a complementary means of detecting the CR over the entire range of electron densities and as a reference for the band mass unrenormalized by interactions. Both CR and MIRO-associated features in the resistance permit extraction of the effective mass of electrons but yield two distinct values. The conventional cyclotron mass representing center-of-mass dynamics exhibits no change with density and coincides with the band electron mass of bulk ZnO, while MIRO mass reveals a systematic increase with lowering electron density consistent with renormalization expected in interacting Fermi liquids.
Additional Information
Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI. Open access publication funded by the Max Planck Society. (Received 24 September 2019; revised 4 September 2020; accepted 8 September 2020; published 24 September 2020) We thank M. Zudov for useful comments. We acknowledge the financial support of JST CREST Grant No. JPMJCR16F1, Japan. J.F. is grateful for support from the Max Planck-University of British Columbia-University of Tokyo Center for Quantum Materials and the Deutsche Forschungsgemeinschaft (FA 1392/2-1). Y.K. acknowledges JST, PRESTO Grant No. JPMJPR1763, Japan. I.D. acknowledges support from the Deutsche Forschungsgemeinschaft (projects DM 1/4-1 and GA501/14-1).Attached Files
Published - PhysRevB.102.115432.pdf
Submitted - 2006.13627.pdf
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Additional details
- Eprint ID
- 116312
- Resolver ID
- CaltechAUTHORS:20220816-403553000
- Japan Science and Technology Agency
- JPMJCR16F1
- Deutsche Forschungsgemeinschaft (DFG)
- FA 1392/2-1
- Japan Science and Technology Agency
- JPMJPR1763
- Deutsche Forschungsgemeinschaft (DFG)
- DM 1/4-1
- Deutsche Forschungsgemeinschaft (DFG)
- GA501/14-1
- Max Planck Society
- Created
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2022-08-16Created from EPrint's datestamp field
- Updated
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2022-08-16Created from EPrint's last_modified field