Taubert, D. and Tomaras, C. and Schinner, G. J. and Tranitz, H. P. and Wegscheider, W. and Kehrein, S. and Ludwig, S. (2011) Relaxation of hot electrons in a degenerate two-dimensional electron system: Transition to one-dimensional scattering. PHYSICAL REVIEW B, 83 (23): 235404. ISSN 1098-0121,
Full text not available from this repository.Abstract
The energy relaxation channels of hot electrons far from thermal equilibrium in a degenerate two-dimensional electron system are investigated in transport experiments in a mesoscopic three-terminal device. We observe a transition from two dimensions at zero magnetic field to quasi-one-dimensional scattering of the hot electrons in a strong magnetic field. In the two-dimensional case, electron-electron scattering is the dominant relaxation mechanism, while the emission of optical phonons becomes more and more important as the magnetic field is increased. The observation of up to 11 optical phonons emitted per hot electron allows us to determine the onset energy of longitudinal-optical phonons in GaAs at cryogenic temperatures with a high precision E(ph) = 36.0 +/- 0.1 meV. Numerical calculations of electron-electron scattering and the emission of optical phonons underline our interpretation in terms of a transition to one-dimensional dynamics.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | STRONG MAGNETIC-FIELD; OPTICAL-PHONON EMISSION; OSCILLATORY PHOTOCONDUCTIVITY; BALLISTIC TRANSPORT; COLLECTIVE EXCITATIONS; CYCLOTRON-RESONANCE; GALLIUM-ARSENIDE; QUANTUM WIRES; GAS; SURFACE; |
| Subjects: | 500 Science > 530 Physics |
| Divisions: | Physics > Institute of Experimental and Applied Physics |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 09 Jun 2020 07:23 |
| Last Modified: | 09 Jun 2020 07:23 |
| URI: | https://pred.uni-regensburg.de/id/eprint/20676 |
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