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 Pis'ma v Zh. Èksper. Teoret. Fiz., 2017, Volume 105, Issue 9, Pages 577–580 (Mi jetpl5264)

MISCELLANEOUS

Bifurcations of the Creation of Low-Temperature Maxima of the Tunneling Conductance of a “dirty” $N$-$I$-$N$ Junction

V. Ya. Kirpichenkov, N. V. Kirprchenkova, O. I. Lozin, A. A. Pukhlova

South Russian State Polytechnic University, Novocherkassk, Russia

Abstract: The representation of the tunneling conductance $G(T)$ of the “dirty” (with low concentrations of the same nonmagnetic impurities in the I layer) $N$-$I$-$N$ junction (where $N$ is a normal metal and $I$ is an insulator) in the form of a sum of conductances of random quantum jumpers penetrating the disordered $I$ layer is obtained in the low-temperature region. It is shown that the axis of the parameter $\delta=|\varepsilon_0-\varepsilon_{\mathrm{F}}|$ giving the deviation of the energy of $\varepsilon_0$ the quasi-local electron state on the impurity in the I layer from the Fermi energy of $\varepsilon_{\mathrm{F}}$ the dirty $N$-$I$-$N$ junction contains a series of bifurcation points, at the transition through each of which (in the direction of the increase in $\delta$) the number of maxima on the temperature dependence $G(T)$ increases by unity; i.e., a new maximum is “born” on the curve $G(T)$. Numerical estimates are given for the characteristic parameters of dirty $N$-$I$-$N$ junctions indicating the possibility of the experimental observation of at least the first of these maxima.

 Funding Agency Grant Number Russian Foundation for Basic Research 16-32-00135_ìîë_à

DOI: https://doi.org/10.7868/S0370274X17090120

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English version:
Journal of Experimental and Theoretical Physics Letters, 2017, 105:9, 613–616

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Revised: 31.03.2017

Citation: V. Ya. Kirpichenkov, N. V. Kirprchenkova, O. I. Lozin, A. A. Pukhlova, “Bifurcations of the Creation of Low-Temperature Maxima of the Tunneling Conductance of a “dirty” $N$-$I$-$N$ Junction”, Pis'ma v Zh. Èksper. Teoret. Fiz., 105:9 (2017), 577–580; JETP Letters, 105:9 (2017), 613–616

Citation in format AMSBIB
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This publication is cited in the following articles:
1. V. Ya. Kirpichenkov, N. V. Kirprchenkova, O. I. Lozin, A. A. Pukhlova, JETP Letters, 108:2 (2018), 112–115
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