Microwave response of interacting oxide two-dimensional electron systems
| Autor: | Yusuke Kozuka, Boris Gorshunov, Joseph Falson, Alexander Boris, Atsushi Tsukazaki, S. I. Dorozhkin, Daniela Tabrea, Masashi Kawasaki, Ivan Dmitriev, K. von Klitzing |
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| Rok vydání: | 2020 |
| Předmět: |
Electron density
Materials science Condensed Matter - Mesoscale and Nanoscale Physics Cyclotron Cyclotron resonance Oxide FOS: Physical sciences 02 engineering and technology Electron 021001 nanoscience & nanotechnology 01 natural sciences Molecular physics law.invention chemistry.chemical_compound Effective mass (solid-state physics) chemistry law Mesoscale and Nanoscale Physics (cond-mat.mes-hall) 0103 physical sciences Coulomb 010306 general physics 0210 nano-technology Microwave |
| Zdroj: | Physical Review B. 102 |
| ISSN: | 2469-9969 2469-9950 |
| DOI: | 10.1103/physrevb.102.115432 |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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