Features of microwave photoconductance of quantum point contact and silicon field effect transistor

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Resumo

Quantum point contacts with a short (100 nm) channel in a high mobility two-dimensional electron gas of GaAs/Al(Ga)As heterostructures and a short-channel p-type field-effect transistor in a silicon-on-insulator structure were fabricated and studied experimentally and by modeling at the Institute of Semiconductor Physics of the Siberian Branch of the Russian Academy of Sciences in order to study the response of samples to weak irradiation by an electromagnetic field with a frequency of ~2 GHz. This response in the tunnel mode at a temperature of 4.2 K turned out to be gigantic and was observed against the background of features caused by impurity disorder.

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Sobre autores

A. Jaroshevich

Rzhanov Institute of Semiconductor Physics of the Siberian Branch of the Russian Academy of Sciences

Autor responsável pela correspondência
Email: jarosh@isp.nsc.ru
Rússia, Novosibirsk

V. Tkachenko

Rzhanov Institute of Semiconductor Physics of the Siberian Branch of the Russian Academy of Sciences; Novosibirsk State University

Email: jarosh@isp.nsc.ru
Rússia, Novosibirsk; Novosibirsk

Z. Kvon

Rzhanov Institute of Semiconductor Physics of the Siberian Branch of the Russian Academy of Sciences; Novosibirsk State University

Email: jarosh@isp.nsc.ru
Rússia, Novosibirsk; Novosibirsk

N. Kuzmin

Novosibirsk State University

Email: jarosh@isp.nsc.ru
Rússia, Novosibirsk

O. Tkachenko

Rzhanov Institute of Semiconductor Physics of the Siberian Branch of the Russian Academy of Sciences

Email: jarosh@isp.nsc.ru
Rússia, Novosibirsk

D. Baksheev

Novosibirsk State University

Email: jarosh@isp.nsc.ru
Rússia, Novosibirsk

I. Marchishin

Rzhanov Institute of Semiconductor Physics of the Siberian Branch of the Russian Academy of Sciences

Email: jarosh@isp.nsc.ru
Rússia, Novosibirsk

A. Bakarov

Rzhanov Institute of Semiconductor Physics of the Siberian Branch of the Russian Academy of Sciences

Email: jarosh@isp.nsc.ru
Rússia, Novosibirsk

E. Rodyakina

Rzhanov Institute of Semiconductor Physics of the Siberian Branch of the Russian Academy of Sciences; Novosibirsk State University

Email: jarosh@isp.nsc.ru
Rússia, Novosibirsk; Novosibirsk

V. Antonov

Rzhanov Institute of Semiconductor Physics of the Siberian Branch of the Russian Academy of Sciences

Email: jarosh@isp.nsc.ru
Rússia, Novosibirsk

V. Popov

Rzhanov Institute of Semiconductor Physics of the Siberian Branch of the Russian Academy of Sciences

Email: jarosh@isp.nsc.ru
Rússia, Novosibirsk

A. Latyshev

Rzhanov Institute of Semiconductor Physics of the Siberian Branch of the Russian Academy of Sciences; Novosibirsk State University

Email: jarosh@isp.nsc.ru
Rússia, Novosibirsk; Novosibirsk

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2. Fig. 1. Schematic representation of 4-terminal measurements of the QPC conductance (a). Micrograph of a part of the Hall bridge; the removed part shows the split gate of the QPC (b). Micrograph of a sample with a PT; the removed part shows a fragment of the gate (c). Schematic representation of a vertical section of the PT indicating the materials and doping levels of the n- and p-types (d).

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3. Fig. 2. Dependences G(Vg, P) measured at T = 4.2 K for 3 samples with a QPC: the same sample in a type 3 heterostructure for two different coolings (a, d); samples in type 1 and 2 heterostructures, respectively (b, c).

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4. Fig. 3. Dependences G(EF–U0, A) for T = 0 in the quasi-one-dimensional model of transport through an idealized QPC for two different values of the parameter δV : δV = 0; (a) 0 < δV ≈ V (b) (in-phase high-frequency oscillations of the voltage between the potentiometric contacts and the potential barrier under the gate relative to EF).

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5. Fig. 4. The dependence G(Vg, P) measured at T = 4.2 K for a silicon FET (a). The calculated dependence of the source-drain gap conductance on the variables U0 and A in the model of two-dimensional hole transport through the FET for T = 0 and EF = 12 meV taking into account the disorder in the two-dimensional potential and the parameter Gs ≡ 1/Rs(A) (b).

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