Exploring two-dimensional electron gases with two-dimensional Fourier transform spectroscopy

Journal Article · Tue Oct 07 00:00:00 EDT 2014 · Journal of Chemical Physics

DOI:https://doi.org/10.1063/1.4896777· OSTI ID:1083698

Paul, J. ^[1]; Dey, P. ^[1]; Tokumoto, T. ^[2]; Reno, J. L. ^[3]; Hilton, D. J. ^[2]; Karaiskaj, D. ^[1]

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1. Univ. of South Florida, Tampa, FL (United States)
2. Univ. of Alabama at Birmingham, Birmingham, AL (United States)
3. Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)

The dephasing of excitons in a modulation doped single quantum well was carefully measured using time integrated four-wave mixing (FWM) and two-dimensional Fourier transform (2DFT) spectroscopy. These are the first 2DFT measurements performed on a modulation doped single quantum well. The inhomogeneous and homogeneous excitonic line widths were obtained from the diagonal and cross-diagonal profiles of the 2DFT spectra. The laser excitation density and temperature were varied and 2DFT spectra were collected. A very rapid increase of the dephasing decay, and as a result, an increase in the cross-diagonal 2DFT linewidths with temperature was observed. Furthermore, the lineshapes of the 2DFT spectra suggest the presence of excitation induced dephasing and excitation induced shift.

• Research Organization: Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
• Sponsoring Organization: USDOE National Nuclear Security Administration (NNSA)
• Grant/Contract Number: AC04-94AL85000
• OSTI ID: 1083698
• Alternate ID(s): OSTI ID: 1223047
• Report Number(s): SAND-2013-4782J; JCPSA6; 456279
• Journal Information: Journal of Chemical Physics, Vol. 141, Issue 13; ISSN 0021-9606
• Publisher: American Institute of Physics (AIP)
• Country of Publication: United States
• Language: English

Related Subjects

77 NANOSCIENCE AND NANOTECHNOLOGY
quantum wells
four wave mixing
polarization
doping
dephasing