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

R. J. Heron; R. A. Lewis; B. E. Kane; G. R. Facer; R. G. Clark; A. S. Dzurak; N. E. Lumpkin; R. P. Starrett; D. G. Rickel; L. N. Pfeiffer; K. W. West

doi:10.1063/1.125260

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

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

Research output: Contribution to journal › Article › peer-review

5 Scopus citations

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 magneto-photoresponse. 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.

Original language	English (US)
Pages (from-to)	3150-3152
Number of pages	3
Journal	Applied Physics Letters
Volume	75
Issue number	20
DOIs	https://doi.org/10.1063/1.125260
State	Published - Nov 15 1999
Externally published	Yes

All Science Journal Classification (ASJC) codes

Physics and Astronomy (miscellaneous)

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10.1063/1.125260

Cite this

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title = "Quantum point contact in a magnetic field: Far-infrared resonant heating observed in photoconductivity",

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 magneto-photoresponse. 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.",

author = "Heron, {R. J.} and Lewis, {R. A.} and Kane, {B. E.} and Facer, {G. R.} and Clark, {R. G.} and Dzurak, {A. S.} and Lumpkin, {N. E.} and Starrett, {R. P.} and Rickel, {D. G.} and Pfeiffer, {L. N.} and West, {K. W.}",

year = "1999",

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doi = "10.1063/1.125260",

language = "English (US)",

volume = "75",

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journal = "Applied Physics Letters",

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TY - JOUR

T1 - Quantum point contact in a magnetic field

T2 - Far-infrared resonant heating observed in photoconductivity

AU - Heron, R. J.

AU - Lewis, R. A.

AU - Kane, B. E.

AU - Facer, G. R.

AU - Clark, R. G.

AU - Dzurak, A. S.

AU - Lumpkin, N. E.

AU - Starrett, R. P.

AU - Rickel, D. G.

AU - Pfeiffer, L. N.

AU - West, K. W.

PY - 1999/11/15

Y1 - 1999/11/15

N2 - 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 magneto-photoresponse. 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.

AB - 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 magneto-photoresponse. 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.

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JO - Applied Physics Letters

JF - Applied Physics Letters

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

Abstract

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