Regensburg 2016 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 36: Poster Ib

HL 36.18: Poster

Dienstag, 8. März 2016, 15:00–19:00, Poster A

Terahertz spectroscopy and ultrafast electron dynamics of a broad single GaAs/AlGaAs quantum well — •Johannes Schmidt1, 2, Stephan Winnerl1, Martin Teich1, Aaron M. Andrews3, Gottfired Strasser3, Harald Schneider1, and Manfred Helm1, 21Helmholtz-Zentrum Dresden-Rossendorf, 01314 Dresden, Germany — 2Technische Universität Dresden, 01062 Dresden, Germany — 3Technische Universität Wien, A-1040 Vienna, Austria

Ultrafast electron dynamics in quantum well (QW) structures is investigated by applying a strong terahertz (THz) field with a photon energy resonant to an intersubband transition. In particular, if the THz field is in resonance with the transition between the second and third subband, so-called Autler-Townes (or AC Stark) splitting could be observed when probing the 1-2 transition. This effect has been observed previously at mid-infrared wavelengths in an n-type multiple QW [1]. Our efforts aim at investigating the AC-Stark effect in the THz regime using a broad, 36 nm wide single QW where the carrier density can be tuned electrically. We will present our first results indicating absorption by an intersubband transition in the QW, where the electron population can be controlled by an electrical modulation technique. Furthermore, ultrafast electron dynamics in the ps-regime is investigated by narrowband single-color pump-probe measurements performed using a THz free-electron laser.

[1] J. F. Dynes, M. D. Frogley, M. Beck, J. Faist, and C. C. Phillips, Phys. Rev. Lett. 94, 157403 (2005)

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