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Phys. Rev. B 67, 035307 (2003) [5 pages]

Relaxation of quasi-two-dimensional electrons in a quantizing magnetic field probed by time-resolved cyclotron resonance

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G. A. Khodaparast, D. C. Larrabee, and J. Kono
Department of Electrical and Computer Engineering, Rice Quantum Institute, and Center for Nanoscale Science and Technology, Rice University, Houston, Texas 77005

D. S. King
Department of Applied Physics, Stanford University, Stanford, California 94305

S. J. Chung and M. B. Santos
Department of Physics and Astronomy and Center for Semiconductor Physics in Nanostructures, University of Oklahoma, Norman, Oklahoma 73019

Received 3 May 2002; revised 16 September 2002; published 14 January 2003

We have measured the picosecond time-resolved cyclotron resonance of photogenerated transient carriers in undoped InSb/Al0.09In0.91Sb quantum wells by two-color pump-probe spectroscopy in a magnetic field. The strong conduction-band nonparabolicity of InSb causes the average cyclotron mass of the electrons, which we monitor directly in time, to decrease as the electrons relax towards the band edge. In addition, the nonparabolicity results in multiple resonances due to the strongly energy-dependent mass and g factor, allowing us to determine the time evolution of the Fermi-Dirac distribution function for the excited carriers in quantizing magnetic fields.

© 2003 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevB.67.035307
DOI:
10.1103/PhysRevB.67.035307
PACS:
78.20.Jq, 42.50.Md, 78.30.Fs
 
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