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Direct Measurement of HH2-HH1 Intersubband Lifetimes in SiGe Quantum Cascade Structures

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10 Author(s)
Rauter, P. ; Inst. for Semicond. & Solid State Phys., Johannes-Kepler-Univ., Linz ; Fromherz, T. ; Bauer, G. ; Vinh, N.Q.
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We report the first direct measurement of the HH2-HH1 relaxation time for a SiGe QW with transition energy above the optical phonon frequency. The experiments have been performed for an active, electrically biased SiGe structure, and thus our results constitute a key parameter for the design and dynamic simulation of SiGe quantum cascade laser structures. The paper presents the 'as-measured' photocurrent signal data, from which only a virtually constant background has been subtracted for the 'TM first' and 'TE first' cases. On the timescale of our experiment, an exponential HH2-HH1 decay with a single relaxation time significantly larger (~550 fs) than the time resolution of the experiment is observed when the sample is excited by the TM pulse first. In addition the technique provides a path to the measurement of dynamics in quantum cascade structures under operating electrical injection conditions

Published in:

SiGe Technology and Device Meeting, 2006. ISTDM 2006. Third International

Date of Conference:

15-17 May 2006

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