Decoherence mechanisms of Landau level THz excitations in two dimensional electron gases

Journal Article · Wed Dec 04 00:00:00 EST 2013 · AIP Conference Proceedings

DOI:https://doi.org/10.1063/1.4848497· OSTI ID:22261909

Maissen, Curdin; Scalari, Giacomo; Faist, Jérôme ^[1]; Reichl, Christian; Wegscheider, Werner ^[2]

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1. Institut für Quantenelektronik, ETH Zürich (Switzerland)
2. Laboratorium für Festkörperphysik, ETH Zürich (Switzerland)

We report coherent THz transmission measurements on different two dimensional electron gases (2DEGs) in magnetic field. The investigated 2DEGs form in GaAs/AlGaAs heterostructures. A short (1 ps) linearly polarized THz pulse is used to excite inter Landau level transitions. The circular polarized radiation emitted by the 2DEG is then measured by electro optic sampling of the linear component orthogonal to the pump pulse polarization. Here we present measurements on two high mobility samples with μ = 5×10{sup 6}cm{sup 2}/Vs and μ = 16×10{sup 6}cm{sup 2}/Vs respectively. The decay times of the emitted radiation are 5.5 ps and 9 ps respectively at 2 K.

• OSTI ID: 22261909
• Journal Information: AIP Conference Proceedings, Vol. 1566, Issue 1; Conference: ICPS 2012: 31. international conference on the physics of semiconductors, Zurich (Switzerland), 29 Jul - 3 Aug 2012; Other Information: (c) 2013 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); ISSN 0094-243X
• Country of Publication: United States
• Language: English

Related Subjects

75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ALUMINIUM ARSENIDES
EMISSION
EXCITATION
GALLIUM ARSENIDES
MAGNETIC FIELDS
POLARIZATION