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Static and high-frequency hole transport in p-Si/SiGe heterostructures in the extreme quantum limit
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Drichko, I. L., Smirnov, I. Yu., Suslov, A. V., Gal'perin, Yu. M., Vinokur, V. M., Myronov, Maksym and Mironov, O. A. (2007) Static and high-frequency hole transport in p-Si/SiGe heterostructures in the extreme quantum limit. JETP Letters, Vol.86 (No.4). pp. 244-248. doi:10.1134/S0021364007160059 ISSN 0021-3640.
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Official URL: http://dx.doi.org/10.1134/S0021364007160059
Abstract
Complex high-frequency (HF), sigma(AC) = sigma(1) - i sigma(2), and static, sigma(DC), conductivities, as well as current-voltage characteristics, have been measured in p-Si/SiGe heterostructures with a low hole density (p = 8.2 x 10(10) cm(-2)) at temperatures T = 0.3-4.2 K in the ultraquantum limit, when the filling factor is v < 1. In order to determine the components of the HF conductivity, the acoustic contactless method in the "hybrid configuration" is used, when the surface acoustic wave propagates on the surface of the LiNbO3 piezoelectric and the heterostructure is pressed to the surface by a spring. The conductivities sigma(1) and sigma(2) are determined from the damping and velocity of the surface acoustic waves that are measured simultaneously with varying the magnetic field. The revealed HF conductivity features->> |sigma(2)|, the negative sign of sigma(2), the threshold behavior of the current-voltage characteristic, and the dependence I proportional to exp(-A/V-0.3) in the subthreshold region-indicate the formation of a pinned Wigner crystal (glass) in the ultraquantum limit (T = 0.3-0.8 K, B > 14 T).
Item Type: | Journal Article | ||||
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Subjects: | Q Science > QC Physics | ||||
Divisions: | Faculty of Science, Engineering and Medicine > Science > Physics | ||||
Journal or Publication Title: | JETP Letters | ||||
Publisher: | MAIK Nauka - Interperiodica | ||||
ISSN: | 0021-3640 | ||||
Official Date: | 15 October 2007 | ||||
Dates: |
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Volume: | Vol.86 | ||||
Number: | No.4 | ||||
Number of Pages: | 5 | ||||
Page Range: | pp. 244-248 | ||||
DOI: | 10.1134/S0021364007160059 | ||||
Status: | Peer Reviewed | ||||
Publication Status: | Published | ||||
Access rights to Published version: | Restricted or Subscription Access |
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