Temperature and Pump Pulse Dependence of Superfluoresence from InGaAs/GaAs Multiple Quantum Well in High Magnetic Fields

ORAL

Abstract

Using intense near-IR ultrashort pulse laser excitation, we investigate the characteristics of cooperative emission (superfluoresence) from dense electron hole magneto-plasmas in InGaAs/GaAs MQW in high magnetic fields as a function of temperature and excitation pulsewidth. We find strong narrow line emissions from 0-0 and 1-1 Landau levels (LLs), with thresholds depending on magnetic field and temperature. Varying the excitation pulsewidth (180 fs -- 60 ps) and fluence (0.1 -- 1 mJ/cm$^{2})$, we observe qualitative changes in the emission strengths from different LLs. The strong emissions from 0-0 and 1-1 LL excited with short and long pulses are obviously different. Mechanisms of the temperature and excitation pulse width effect on the strong emission are presented.

*Supported by the NSF through grant DMR-0325499 and by the NHMFL through an IHRP grant.

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Authors

  • X. Wang

    • University of Florida
    • Univ. of Florida

  • Y.D. Jho

    • University of Florida
    • NHMFL, FSU

  • Jinho Lee

    • University of Florida

  • David Reitze

    • University of Florida

  • Junichiro Kono

    • Rice University
    • Rice Univ.
    • ECE Dept. at Rice University
    • Department of Electrical and Computer Engineering, Rice University

  • Alexey Belyanin

    • Texas A\&M University

  • Vitaly Kocharovsky

    • Texas A\&M University

  • Glenn Solomon

    • Stanford University

  • Xing Wei

    • NHMFL

  • Stephen McGill

    • NHMFL