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Quantum point contact in a magnetic field: Far-infrared resonant heating observed in photoconductivity

Journal Article


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Abstract


  • We report on the far-infrared photoresponse of a quantum point contact device fabricated on a

    top-gated GaAs/AlGaAs heterostructure. The top-gated architecture avoids the disorder built into

    conventional modulation-doped structures. We observe a distinctive far-infrared magnetophotoresponse. This depends on the wavelength of the radiation and on the carrier density, which is controlled by the gate voltage. We conclude by comparison with transport data that the oscillations observed in photoconductivity and which are centred around the cyclotron energy arise from the resonant heating of electrons by the far-infrared radiation.

UOW Authors


  •   Heron, R J. (external author)
  •   Lewis, R A.
  •   Kane, B E. (external author)
  •   Facer, G R. (external author)
  •   Clark, R G. (external author)
  •   Dzurak, Andrew S. (external author)
  •   Lumpkin, N E. (external author)
  •   Starrett, R P. (external author)
  •   Rickel, D G. (external author)
  •   Pfeiffer, L N. (external author)
  •   West, K W. (external author)

Publication Date


  • 1999

Citation


  • Heron, R. J., Lewis, R. A., Kane, B. E., Facer, G. R., Clark, R. G., Dzurak, A. S., Lumpkin, N. E., Starrett, R. P., Rickel, D. G., Pfeiffer, L. N. & West, K. W. (1999). Quantum point contact in a magnetic field: Far-infrared resonant heating observed in photoconductivity. Applied Physics Letters, 75 (20), 3150-3152.

Scopus Eid


  • 2-s2.0-0039771117

Ro Full-text Url


  • http://ro.uow.edu.au/cgi/viewcontent.cgi?article=1474&context=engpapers

Ro Metadata Url


  • http://ro.uow.edu.au/engpapers/459

Number Of Pages


  • 2

Start Page


  • 3150

End Page


  • 3152

Volume


  • 75

Issue


  • 20

Abstract


  • We report on the far-infrared photoresponse of a quantum point contact device fabricated on a

    top-gated GaAs/AlGaAs heterostructure. The top-gated architecture avoids the disorder built into

    conventional modulation-doped structures. We observe a distinctive far-infrared magnetophotoresponse. This depends on the wavelength of the radiation and on the carrier density, which is controlled by the gate voltage. We conclude by comparison with transport data that the oscillations observed in photoconductivity and which are centred around the cyclotron energy arise from the resonant heating of electrons by the far-infrared radiation.

UOW Authors


  •   Heron, R J. (external author)
  •   Lewis, R A.
  •   Kane, B E. (external author)
  •   Facer, G R. (external author)
  •   Clark, R G. (external author)
  •   Dzurak, Andrew S. (external author)
  •   Lumpkin, N E. (external author)
  •   Starrett, R P. (external author)
  •   Rickel, D G. (external author)
  •   Pfeiffer, L N. (external author)
  •   West, K W. (external author)

Publication Date


  • 1999

Citation


  • Heron, R. J., Lewis, R. A., Kane, B. E., Facer, G. R., Clark, R. G., Dzurak, A. S., Lumpkin, N. E., Starrett, R. P., Rickel, D. G., Pfeiffer, L. N. & West, K. W. (1999). Quantum point contact in a magnetic field: Far-infrared resonant heating observed in photoconductivity. Applied Physics Letters, 75 (20), 3150-3152.

Scopus Eid


  • 2-s2.0-0039771117

Ro Full-text Url


  • http://ro.uow.edu.au/cgi/viewcontent.cgi?article=1474&context=engpapers

Ro Metadata Url


  • http://ro.uow.edu.au/engpapers/459

Number Of Pages


  • 2

Start Page


  • 3150

End Page


  • 3152

Volume


  • 75

Issue


  • 20