Wurstbauer, Ursula and Sliwa, Cezary and Weiss, Dieter and Dietl, Tomasz and Wegscheider, Werner (2010) Hysteretic magnetoresistance and thermal bistability in a magnetic two-dimensional hole system. NATURE PHYSICS, 6 (12). pp. 955-959. ISSN 1745-2473, 1745-2481
Full text not available from this repository. (Request a copy)Abstract
Colossal negative magnetoresistance and the associated field-induced insulator-to-metal transition-the most characteristic features of magnetic semiconductors-are observed in n-type rare-earth oxides(1) and chalcogenides(2), p-type manganites(3) and n-type(4,5) and p-type diluted magnetic semiconductors(4,6), as well as in quantum wells of n-type diluted magnetic semiconductors(7-9). Here, we report on magnetotransport studies of Mn-modulation-doped InAs quantum wells, which reveal an insulator-to-metal transition that is driven by a magnetic field and dependent on bias voltage, with abrupt and hysteretic changes of resistance over several orders of magnitude. These phenomena coexist with the quantized Hall effect in high magnetic fields. We show that the exchange coupling between a hole and the parent Mn acceptor produces a magnetic anisotropy barrier that shifts the spin relaxation time of the bound hole to a 100 s range in compressively strained quantum wells. This bistability of the individual Mn acceptors explains the hysteretic behaviour while opening prospects for information storing and processing. At high bias voltage another bistability, caused by the overheating of electrons(10), gives rise to abrupt resistance jumps.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | METAL-INSULATOR-TRANSITION; SEMICONDUCTORS; ELECTRON; SPIN; MAGNETOTRANSPORT; LOCALIZATION; TRANSPORT; |
| Subjects: | 500 Science > 530 Physics |
| Divisions: | Physics > Institute of Experimental and Applied Physics > Alumni or Retired Professors > Group Werner Wegscheider Physics > Institute of Experimental and Applied Physics > Chair Professor Weiss > Group Dieter Weiss |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 06 Jul 2020 10:13 |
| Last Modified: | 06 Jul 2020 10:13 |
| URI: | https://pred.uni-regensburg.de/id/eprint/23816 |
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