Andrei D. Zaikin

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An interplay between charge discreteness, coherent scattering, and Coulomb interaction yields nontrivial effects in quantum transport. We derive a real-time effective action and an equivalent quantum Langevin equation for an arbitrary coherent scatterer and evaluate its current-voltage characteristics in the presence of interactions. Within our model, at(More)
P. Dubos, H. Courtois, B. Pannetier, F. K. Wilhelm, A. D. Zaikin, and G. Schön Centre de Recherches sur les Très Basses Températures-C.N.R.S. associated to Université Joseph Fourier, 25 Avenue des Martyrs, 38042 Grenoble, France Institut für Theoretische Festkörperphysik, Universität Karlsruhe, D-76128 Karlsruhe, Germany Quantum Transport Group, Department(More)
We argue that parametrically strong enhancement of a thermoelectric current can be observed in conventional superconductors doped by magnetic impurities. This effect is caused by the violation of the symmetry between electronlike and holelike excitations due to formation of subgap bound Andreev states in the vicinity of magnetic impurities. We develop a(More)
Zaikin et al. Reply: In a recent Letter [1], we reported on a microscopic theory of quantum phase slips (QPS) in thin superconducting wires and arrived at conclusions that are qualitatively different from those of Ref. [2]. For clarity, we summarize the main differences between Refs. [2] and [1]. (1) For thin wires we find a finite QPS fugacity, whereas(More)
Single electron tunneling into small superconducting islands is sensitive to the gap energy of the excitations created in the process and, hence, depends on the electron number parity. At low temperature the properties of the system are 2e-periodic in the applied gate voltage, turning e-periodic at higher temperature. We evaluate the tunneling rates and(More)
We formulate a microscopic theory of nonlocal electron transport in three-terminal diffusive normal-superconducting-normal (NSN) structures with arbitrary interface transmissions. At low energies epsilon, we predict strong enhancement of nonlocal spectral conductance g_{12} proportional, variant1/epsilon due to quantum interference of electrons in(More)
Recently it was demonstrated1 that important information about the effect of electron-electron interactions on quantum transport in disordered conductors can be obtained within a transparent theoretical framework of quasiclassical Langevin equations generalized to situations in which relaxation of the electron distribution function occurs at much longer(More)
We develop a detailed analysis of electron transport in normal diffusive conductors in the presence of proximity induced superconducting correlation. We calculated the linear conductance of the system and the profile of the electric field. A rich structure of temperature dependences was found and explained. Our results are consistent with recent(More)
Crossed Andreev reflection (CAR) in metallic nanostructures, a possible basis for solid-state electron entangler devices, is usually investigated by detecting non-local voltages in multi-terminal superconductor/normal metal devices. This task is difficult because other subgap processes may mask the effects of CAR. One of these processes is the generation of(More)