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Magnetotransport in low-density p-Si/SiGe heterostructures : from metal through hopping insulator to Wigner glass
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Drichko, I. L., Dyakonov, A. M., Smirnov, I. Yu., Suslov, A. V., Galperin, Y. M., Vinokur, Valerii M., Myronov, Maksym, Mironov, O. A. and Leadley, D. R. (David R.) (2008) Magnetotransport in low-density p-Si/SiGe heterostructures : from metal through hopping insulator to Wigner glass. Physical Review B (Condensed Matter and Materials Physics), Vol.77 (No.8). article no. 085327. doi:10.1103/PhysRevB.77.085327 ISSN 1098-0121.
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Official URL: http://dx.doi.org/10.1103/PhysRevB.77.085327
Abstract
We study dc and ac transport in low-density p-Si/SiGe heterostructures at low temperatures and in a broad domain of magnetic fields up to 18 T. Complex ac conductance is determined from simultaneous measurement of velocity and attenuation of a surface acoustic wave propagating in close vicinity of the two-dimensional hole layer. The observed behavior of dc and ac conductances is interpreted as an evolution from metallic conductance at B=0 through hopping between localized states in intermediate magnetic fields (close to the plateau of the integer quantum Hall effect corresponding to the Landau-level filling factor nu=1) to formation of the Wigner glass in the extreme quantum limit (B greater than or similar to 14, T less than or similar to 0.8 K).
Item Type: | Journal Article | ||||
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Subjects: | Q Science > QC Physics | ||||
Divisions: | Faculty of Science, Engineering and Medicine > Science > Physics | ||||
Library of Congress Subject Headings (LCSH): | Heterostructures, Silicon, Germanium, Magnetic fields | ||||
Journal or Publication Title: | Physical Review B (Condensed Matter and Materials Physics) | ||||
Publisher: | American Physical Society | ||||
ISSN: | 1098-0121 | ||||
Official Date: | February 2008 | ||||
Dates: |
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Volume: | Vol.77 | ||||
Number: | No.8 | ||||
Number of Pages: | 10 | ||||
Page Range: | article no. 085327 | ||||
DOI: | 10.1103/PhysRevB.77.085327 | ||||
Status: | Peer Reviewed | ||||
Publication Status: | Published |
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