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High-frequency transport in p-type Si/Si0.87Ge0.13 heterostructures studied with surface acoustic waves in the quantum Hall regime
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UNSPECIFIED (2005) High-frequency transport in p-type Si/Si0.87Ge0.13 heterostructures studied with surface acoustic waves in the quantum Hall regime. PHYSICAL REVIEW B, 71 (4). -. doi:10.1103/PhysRevB.71.045333 ISSN 1098-0121.
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Official URL: http://dx.doi.org/10.1103/PhysRevB.71.045333
Abstract
The interaction of surface acoustic waves (SAWs) with p-type Si/Si0.87Ge0.13 heterostructures has been studied for SAW frequencies of 30-300 MHz. For temperatures in the range 0.7<T<1.6 K and magnetic fields up to 7 T, the SAW attenuation coefficient Gamma and velocity change DeltaV/V were found to oscillate with filling factor. Both the real sigma(1) and imaginary sigma(2) components of the high-frequency conductivity have been determined and compared with quasi-dc magnetoresistance measurements at temperatures down to 33 mK. By analyzing the ratio of sigma(1) to sigma(2), carrier localization can be followed as a function of temperature and magnetic field. At T=0.7 K, the variations of Gamma, DeltaV/V, and sigma(1) with SAW intensity have been studied and can be explained by heating of the two-dimensional hole gas by the SAW electric field. Energy relaxation is found to be dominated by acoustic phonon deformation potential scattering with weak screening.
Item Type: | Journal Article | ||||
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Subjects: | Q Science > QC Physics | ||||
Journal or Publication Title: | PHYSICAL REVIEW B | ||||
Publisher: | AMERICAN PHYSICAL SOC | ||||
ISSN: | 1098-0121 | ||||
Official Date: | January 2005 | ||||
Dates: |
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Volume: | 71 | ||||
Number: | 4 | ||||
Number of Pages: | 6 | ||||
Page Range: | - | ||||
DOI: | 10.1103/PhysRevB.71.045333 | ||||
Publication Status: | Published |
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