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Pis'ma v Zh. Èksper. Teoret. Fiz., 2012, Volume 96, Issue 9, Pages 646–650 (Mi jetpl3272)  

CONDENSED MATTER

Zero-bias tunneling anomaly in a two-dimensional electron system with disorder

I. N. Kotel地ikova, S. E. Dizhura, E. N. Morozovaa, È. V. Devyatovb, V. T. Dolgopolovb

a Kotel'nikov Institute of Radio Engineering and Electronics, Russian Academy of Sciences
b Institute of Solid State Physics, Russian Academy of Sciences

Abstract: The temperature dependence of a zero-bias anomaly in the tunneling conductance of an Al/$\delta$-GaAs tunneling structure with a two-dimensional electron density in the $\delta$-layer of $3.5 \times 10^{12}$ cm$^{-2}$ has been investigated. It has been shown that the respective drop $\Delta\rho(\varepsilon,T)$ in the tunneling density of states $\rho$ near the Fermi level $E_{\mathrm F}$ of the two-dimensional electron system depends logarithmically on the energy $\varepsilon$ within the range of $2.7kT<|\varepsilon|<\hbar/\tau$, where $\varepsilon$ is measured with respect to $E_{\mathrm F}$ and $\tau$ is the momentum relaxation time of two-dimensional electrons. It has been found that the drop depth $\Delta\rho(0,T)/\rho$ is also proportional to $\ln(kT/\varepsilon_{0})$ in the temperature range $T = 0.1$$20$ K and saturates below $0.1$ K.

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English version:
Journal of Experimental and Theoretical Physics Letters, 2012, 96:9, 577–581

Bibliographic databases:

Document Type: Article
Received: 20.09.2012

Citation: I. N. Kotel地ikov, S. E. Dizhur, E. N. Morozova, È. V. Devyatov, V. T. Dolgopolov, “Zero-bias tunneling anomaly in a two-dimensional electron system with disorder”, Pis'ma v Zh. Èksper. Teoret. Fiz., 96:9 (2012), 646–650; JETP Letters, 96:9 (2012), 577–581

Citation in format AMSBIB
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\by I.~N.~Kotel地ikov, S.~E.~Dizhur, E.~N.~Morozova, \`E.~V.~Devyatov, V.~T.~Dolgopolov
\paper Zero-bias tunneling anomaly in a two-dimensional electron system with disorder
\jour Pis'ma v Zh. \`Eksper. Teoret. Fiz.
\yr 2012
\vol 96
\issue 9
\pages 646--650
\mathnet{http://mi.mathnet.ru/jetpl3272}
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\transl
\jour JETP Letters
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\pages 577--581
\crossref{https://doi.org/10.1134/S0021364012210072}
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