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Positive quasiclassical magnetoresistance and quantum effects in germanium quantum wells
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Berkutov, I. B., Andrievskii, V. V., Komnik, Yu. F. and Mironov, O. A. (2010) Positive quasiclassical magnetoresistance and quantum effects in germanium quantum wells. Low Temperature Physics, Vol.36 (No.12). p. 1076. doi:10.1063/1.3536348
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Official URL: http://dx.doi.org/10.1063/1.3536348
Abstract
Changes in the conductivity of p-type quantum-well heterostructures of Si(0.05)Ge(0.95) alloy are studied at temperatures ranging from 0.352-7.1 K and magnetic fields of up to 11 T. The distinctive feature of the sample was asymmetric doping, with layers of Si(0.4)Ge(0.6) with boron impurity concentrations of 2 . 10(18) and 8 . 10(18) cm(-3) positioned on opposite sides of the quantum well. Shubnikov-de Haas oscillations were observed clearly against the background of a high quasi-classical positive magnetoresistance. The field dependence of the magnetoresistance is well described by a function of the form rho(xx)(B)/rho(xx)(0)proportional to B(12/7), as predicted by a theory including the combined effect of both short-and long-range disorder. The contribution to the temperature and magnetic field dependences of the resistance owing to quantum corrections associated with weak localization and charge carrier interactions is determined. Strong spin-orbital scattering of holes on the quantum well is revealed by analyzing these corrections. A study of the variations in the amplitude of the Shubnikov-de Haas oscillations with temperature and magnetic field (including the monotonic behavior of the resistance with changing magnetic field) makes it possible to determine the effective mass of the charge carriers, m*=0.17m(0) The temperature dependence of the hole-phonon relaxation time was found by studying the overheating of charge carriers by an electric field. (C) 2010 American Institute of Physics. [doi:10.1063/1.3536348]
| Item Type: | Journal Article | ||||
|---|---|---|---|---|---|
| Divisions: | Faculty of Science > Physics | ||||
| Journal or Publication Title: | Low Temperature Physics | ||||
| Publisher: | American Institute of Physics | ||||
| ISSN: | 1063-777X | ||||
| Official Date: | 2010 | ||||
| Dates: |
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| Volume: | Vol.36 | ||||
| Number: | No.12 | ||||
| Page Range: | p. 1076 | ||||
| DOI: | 10.1063/1.3536348 | ||||
| Status: | Peer Reviewed | ||||
| Publication Status: | Published | ||||
| Access rights to Published version: | Restricted or Subscription Access |
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