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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 18, Iss. 12 — Jun. 7, 2010
  • pp: 12354–12361

Direct measurement of cyclotron coherence times of high-mobility two-dimensional electron gases

X. Wang, D. J. Hilton, J. L. Reno, D. M. Mittleman, and J. Kono  »View Author Affiliations


Optics Express, Vol. 18, Issue 12, pp. 12354-12361 (2010)
http://dx.doi.org/10.1364/OE.18.012354


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Abstract

We have observed long-lived (~30 ps) coherent oscillations of charge carriers due to cyclotron resonance (CR) in high-mobility two-dimensional electrons in GaAs in perpendicular magnetic fields using time-domain terahertz spectroscopy. The observed coherent oscillations were fitted well by sinusoids with exponentially-decaying amplitudes, through which we were able to provide direct and precise measures for the decay times and oscillation frequencies simultaneously. This method thus overcomes the CR saturation effect, which is known to prevent determination of true CR linewidths in high-mobility electron systems using Fourier-transform infrared spectroscopy.

© 2010 Optical Society of America

OCIS Codes
(320.7150) Ultrafast optics : Ultrafast spectroscopy
(300.6495) Spectroscopy : Spectroscopy, teraherz

ToC Category:
Spectroscopy

History
Original Manuscript: February 17, 2010
Revised Manuscript: April 16, 2010
Manuscript Accepted: May 14, 2010
Published: May 26, 2010

Citation
X. Wang, D. J. Hilton, J. L. Reno, D. M. Mittleman, and J. Kono, "Direct measurement of cyclotron coherence times of high-mobility two-dimensional electron gases," Opt. Express 18, 12354-12361 (2010)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-18-12-12354


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References

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