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Title: Cyclotron resonance spectroscopy of a high-mobility two-dimensional electron gas from 0.4 to 100 K at high filling factors

Abstract

We have studied the cyclotron mobility 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 sample with a low frequency mobility of μ dc = 3.6 x 10 6 cm 2 V -1 s -1 and a carrier concentration of ns = 2 x 10 6 cm -2. The low temperature mobility in this sample results from both impurity scattering and acoustic deformation potential scattering, with μ$$-1\atop{CR}$$ ≈ (2.1 x 10 5 cm 2 V -1 s -1) -1 + (3.8 x 10 -8 V sK -1 cm -2 x T) -1 at low temperatures. Above 50 K, the cyclotron oscillations show a strong reduction in both the oscillation amplitude and lifetime that is dominated by the contribution due to polar optical phonons. These results suggest that electron dephasing times as long as ~ 300 ps are possible even at this high lling factor (v = 6:6) in higher mobility samples (> 10 7 cm 2 V -1 s -1) that have lower impurity concentrations and where the cyclotron mobility at this carrier concentration would be limited by acoustic deformation potential scattering.

Authors:
 [1];  [1];  [2];  [3];  [4];  [2];  [5];  [1]
  1. Univ. of Alabama, Birmingham, AL (United States)
  2. Florida State Univ., Tallahassee, FL (United States). National High Magnetic Field Lab. (MagLab)
  3. Rice Univ., Houston, TX (United States)
  4. Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
  5. Univ. of South Florida, Tampa, FL (United States)
Publication Date:
Research Org.:
Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
OSTI Identifier:
1427259
Report Number(s):
SAND-2015-9127J
Journal ID: ISSN 9999-0014; 608007
DOE Contract Number:  
AC04-94AL85000
Resource Type:
Journal Article
Journal Name:
Sandia journal manuscript; Not yet accepted for publication
Additional Journal Information:
Journal Name: Sandia journal manuscript; Not yet accepted for publication; Journal ID: ISSN 9999-0014
Publisher:
Sandia
Country of Publication:
United States
Language:
English

Citation Formats

Curtis, Jeremy A., Tokumoto, Takahisa, Cherian, Judy G., Kuno, J., Reno, John L., McGill, Stephen A., Karaiskaj, Denis, and Hilton, David J. Cyclotron resonance spectroscopy of a high-mobility two-dimensional electron gas from 0.4 to 100 K at high filling factors. United States: N. p., 2015. Web.
Curtis, Jeremy A., Tokumoto, Takahisa, Cherian, Judy G., Kuno, J., Reno, John L., McGill, Stephen A., Karaiskaj, Denis, & Hilton, David J. Cyclotron resonance spectroscopy of a high-mobility two-dimensional electron gas from 0.4 to 100 K at high filling factors. United States.
Curtis, Jeremy A., Tokumoto, Takahisa, Cherian, Judy G., Kuno, J., Reno, John L., McGill, Stephen A., Karaiskaj, Denis, and Hilton, David J. Thu . "Cyclotron resonance spectroscopy of a high-mobility two-dimensional electron gas from 0.4 to 100 K at high filling factors". United States. https://www.osti.gov/servlets/purl/1427259.
@article{osti_1427259,
title = {Cyclotron resonance spectroscopy of a high-mobility two-dimensional electron gas from 0.4 to 100 K at high filling factors},
author = {Curtis, Jeremy A. and Tokumoto, Takahisa and Cherian, Judy G. and Kuno, J. and Reno, John L. and McGill, Stephen A. and Karaiskaj, Denis and Hilton, David J.},
abstractNote = {We have studied the cyclotron mobility 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 sample with a low frequency mobility of μdc = 3.6 x 106 cm2 V-1 s-1 and a carrier concentration of ns = 2 x 106 cm-2. The low temperature mobility in this sample results from both impurity scattering and acoustic deformation potential scattering, with μ$-1\atop{CR}$ ≈ (2.1 x 105 cm2 V-1 s-1)-1 + (3.8 x 10-8 V sK-1 cm-2 x T)-1 at low temperatures. Above 50 K, the cyclotron oscillations show a strong reduction in both the oscillation amplitude and lifetime that is dominated by the contribution due to polar optical phonons. These results suggest that electron dephasing times as long as ~ 300 ps are possible even at this high lling factor (v = 6:6) in higher mobility samples (> 107 cm2 V-1 s-1) that have lower impurity concentrations and where the cyclotron mobility at this carrier concentration would be limited by acoustic deformation potential scattering.},
doi = {},
journal = {Sandia journal manuscript; Not yet accepted for publication},
issn = {9999-0014},
number = ,
volume = ,
place = {United States},
year = {2015},
month = {10}
}