THz-Photoconductivity of Quantum Hall Systems in Quasi-Corbino-Geometry

Notthoff, Christian; Lorke, Axel; Rachor, K.; Heitmann, D.; Reuter, D.

doi:10.1007/s10909-009-0116-4

Cited by 1 publication

(2 citation statements)

References 12 publications

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“…In contrast to the spectrally resolved photoresponse of samples in standard Corbino topology (see Ref. 22) and samples in hall-bar topology (see Ref. 5), where a asymmetric broadening at filling factors ν > 2 is observed, here we observe only one symmetric resonance.…”

Section: B Spectrally Resolved Measurementscontrasting

confidence: 91%

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Terahertz photoresponse of a quantum Hall edge-channel diode

et al. 2009

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The Teraherz (THz) photoresponse of a two-dimensional electron gas in the quantum Hall regime is investigated. We use a sample structure which is topologically equivalent to a Corbino geometry combined with a cross-gate technique. This quasi-Corbino geometry allows us to directly investigate the THz-induced transport between adjacent edge-states, thus avoiding bulk effects. We find a pronounced photo voltage at zero applied bias, which rapidly decreases when an external current bias is applied. The photo voltage and its dependence on the bias current can be described using the model of an illuminated photodiode, resulting from the reconstruction of the Landau bands at the sample edge. Using the sample as a detector in a Fourier transform spectrometer setup, we find a resonant response from which we extract a reduced effective cyclotron mass. The findings support a non-bolometric mechanism of the induced photo voltage and the proposed edge-channel diode model.Comment: 5 pages, 5 eps-figures, accepted for Phys. Rev.

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Section: B Spectrally Resolved Measurementscontrasting

confidence: 91%

“…Furthermore, the model of an illuminated "edge-channel diode" offers an explanation for the asymmetric broadening observed in spectrally resolved photoresponse measurements on samples in standard Corbino topology (see Ref. 22) as well as in hall-bar topology (see Ref.5).…”

Section: Discussionmentioning

confidence: 99%