Highly superlinear giant terahertz photoconductance in GaAs quantum point contacts in the deep tunneling regime

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Highly superlinear giant terahertz photoconductance in GaAs quantum point contacts in the deep tunneling regime. / Otteneder, M.; Hild, M.; Kvon, Z. D. et al.

In: Physical Review B, Vol. 104, No. 20, 205304, 15.11.2021.

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

BibTeX

@article{43c0864dd5794d14bf7b3678f2e2c644,

title = "Highly superlinear giant terahertz photoconductance in GaAs quantum point contacts in the deep tunneling regime",

abstract = "A highly superlinear in radiation intensity photoconductance induced by continuous wave terahertz laser radiation with low intensities has been observed in quantum point contacts made of GaAs quantum wells operating in the deep tunneling regime. For very low values of the normalized dark conductance Gdark/G0≈10-6, with the conductance quantum G0=2e2/h, the photoconductance scales exponentially with the radiation intensity, so that already at 100mW/cm2, it increases by almost four orders of magnitude. This effect is observed for a radiation electric field oriented along the source drain direction. We provide model considerations of the effect and attribute it to the variation of the tunneling barrier height by the radiation field made possible by local diffraction effects. We also demonstrate that cyclotron resonance due to an external magnetic field manifests itself in the photoconductance, completely suppressing the photoresponse.",

author = "M. Otteneder and M. Hild and Kvon, {Z. D.} and Rodyakina, {E. E.} and Glazov, {M. M.} and Ganichev, {S. D.}",

note = "Publisher Copyright: {\textcopyright} 2021 American Physical Society.",

year = "2021",

month = nov,

day = "15",

doi = "10.1103/PhysRevB.104.205304",

language = "English",

volume = "104",

journal = "Physical Review B",

issn = "2469-9950",

publisher = "American Physical Society",

number = "20",

}

RIS

TY - JOUR

T1 - Highly superlinear giant terahertz photoconductance in GaAs quantum point contacts in the deep tunneling regime

AU - Otteneder, M.

AU - Hild, M.

AU - Kvon, Z. D.

AU - Rodyakina, E. E.

AU - Glazov, M. M.

AU - Ganichev, S. D.

PY - 2021/11/15

Y1 - 2021/11/15

N2 - A highly superlinear in radiation intensity photoconductance induced by continuous wave terahertz laser radiation with low intensities has been observed in quantum point contacts made of GaAs quantum wells operating in the deep tunneling regime. For very low values of the normalized dark conductance Gdark/G0≈10-6, with the conductance quantum G0=2e2/h, the photoconductance scales exponentially with the radiation intensity, so that already at 100mW/cm2, it increases by almost four orders of magnitude. This effect is observed for a radiation electric field oriented along the source drain direction. We provide model considerations of the effect and attribute it to the variation of the tunneling barrier height by the radiation field made possible by local diffraction effects. We also demonstrate that cyclotron resonance due to an external magnetic field manifests itself in the photoconductance, completely suppressing the photoresponse.

AB - A highly superlinear in radiation intensity photoconductance induced by continuous wave terahertz laser radiation with low intensities has been observed in quantum point contacts made of GaAs quantum wells operating in the deep tunneling regime. For very low values of the normalized dark conductance Gdark/G0≈10-6, with the conductance quantum G0=2e2/h, the photoconductance scales exponentially with the radiation intensity, so that already at 100mW/cm2, it increases by almost four orders of magnitude. This effect is observed for a radiation electric field oriented along the source drain direction. We provide model considerations of the effect and attribute it to the variation of the tunneling barrier height by the radiation field made possible by local diffraction effects. We also demonstrate that cyclotron resonance due to an external magnetic field manifests itself in the photoconductance, completely suppressing the photoresponse.

UR - http://www.scopus.com/inward/record.url?scp=85119179055&partnerID=8YFLogxK

U2 - 10.1103/PhysRevB.104.205304

DO - 10.1103/PhysRevB.104.205304

M3 - Article

AN - SCOPUS:85119179055

VL - 104

JO - Physical Review B

JF - Physical Review B

SN - 2469-9950

IS - 20

M1 - 205304

ER -

ID: 34691816