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Verhandlungen
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DPG

Berlin 2008 – scientific programme

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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. Koch11Fachbereich 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)

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