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Cyclotron decay time of a two-dimensional electron gas from 0.4 to 100 K

Title: Cyclotron decay time of a two-dimensional electron gas from 0.4 to 100 K.
Name(s): Curtis, Jeremy A., author
Tokumoto, Takahisa, author
Hatke, A. T., author
Cherian, Judy G., author
Reno, John L., author
McGill, Stephen A., author
Karaiskaj, Denis, author
Hilton, David J., author
Type of Resource: text
Genre: Text
Date Issued: 2016-04-29
Physical Form: computer
online resource
Extent: 1 online resource
Language(s): English
Abstract/Description: We have studied the cyclotron decay time of a Landau-quantized two-dimensional electron gas as a function of temperature (0.4-100 K) at a fixed magnetic field (+/- 1.25 T) using terahertz time-domain spectroscopy in a gallium arsenide quantum well with a mobility of mu(dc) = 3.6 x 10(6) cm(2) V-1 s(-1) and a carrier concentration of n(s) = 2 x 10(11) cm(-2). We find a cyclotron decay time that is limited by superradiant decay of the cyclotron ensemble and a temperature dependence that may result from both dissipative processes as well as a decrease in n(s) below 1.5K. Shubnikov-de Haas characterization determines a quantum lifetime, tau(q) = 1.1 ps, which is significantly faster than the corresponding dephasing time, tau(s) = 66.4 ps, in our cyclotron data. This is consistent with small-angle scattering as the dominant contribution in this sample, where scattering angles below theta <= 13 degrees. do not efficiently contribute to dephasing. Above 50 K, the cyclotron oscillations show a strong reduction in both the oscillation amplitude and lifetime that result from polar optical phonon scattering.
Identifier: FSU_libsubv1_wos_000375202600004 (IID), 10.1103/PhysRevB.93.155437 (DOI)
Keywords: carrier density, domain spectroscopy, gaas-alxga1-xas heterostructures, heterojunctions, high-mobility, material parameters, phonon-scattering, quantum, resonance linewidth, terahertz spectroscopy
Publication Note: The publisher’s version of record is available at
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Host Institution: FSU
Is Part Of: Physical Review B.
Issue: iss. 15, vol. 93

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Curtis, J. A., Tokumoto, T., Hatke, A. T., Cherian, J. G., Reno, J. L., McGill, S. A., … Hilton, D. J. (2016). Cyclotron decay time of a two-dimensional electron gas from 0.4 to 100 K. Physical Review B. Retrieved from