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HL: Fachverband Halbleiterphysik
HL 53: Optical properties
HL 53.8: Talk
Friday, February 29, 2008, 12:30–12:45, EW 201
Terahertz spectroscopy on a two-dimensional electron gas: Experiment — •Torben Grunwald1, Sangam Chatterjee1, David Köhler1, Klaus Pierz2, Daniel Golde1, Mackillo Kira1, and Stephan W. Koch1 — 1Fachbereich Physik, Philipps-Universität, Renthof 5, D-35032 Marburg — 2Physikalisch-Technische Bundesanstalt, Bundesallee 100, D-38116 Braunschweig
We present THz transmission
experiments on a two-dimensional electron gas (2DEG) with variable
density. The THz response clearly shows a plasmon pole whose
spectral position shifts to higher energies with increasing carrier
density. This THz response of an unambiguously 2-dimensional system
is similar to the response of a 3-dimensional system, observed by
Huber et. al3. Furthermore, our measurements are in excellent
agreement with a recently developed microscopic theory, indicating,
that the bare plasmon properties are independent of dimensionality.
A detailed analysis will be presented by D. Golde in "Terahertz
spectroscopy on a two-dimensional electron gas: Theory".
3Huber, R. et al., Nature 414, 286-289 (2001)