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Dive into the research topics where K. B. Efetov is active.

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Featured researches published by K. B. Efetov.


Reviews of Modern Physics | 2005

Odd triplet superconductivity and related phenomena in superconductor-ferromagnet structures

F. S. Bergeret; A. F. Volkov; K. B. Efetov

This review considers unusual effects in superconductor-ferromagnet structures, in particular, the triplet component of the condensate generated in those systems. This component is odd in frequency and even in momentum, which makes it insensitive to nonmagnetic impurities. If the exchange field is not homogeneous in the system, the triplet component is not destroyed even by a strong exchange field and can penetrate the ferromagnet over long distances. Some other effects considered here and caused by the proximity effect are enhancement of the Josephson current due to the presence of the ferromagnet, induction of a magnetic moment in superconductors resulting in a screening of the magnetic moment, and formation of periodic magnetic structures due to the influence of the superconductor. Finally, theoretical predictions are compared with existing experiments.


Advances in Physics | 1983

Supersymmetry and theory of disordered metals

K. B. Efetov

Abstract Theoretical studies of the motion of an electron in a disordered system have led to a number of remarkable results especially those concerned with localization and with the importance of dimensionality. The theoretical approaches previously used run into some severe technical difficulties. This article sets out the bases of the recently introduced supersymmetry method which has already, as the article shows, provided unified derivations of the major results in this subject, free of the technical problems. The method reduces the systems it treats to field-theoretical models involving both bosons and fermions.


Reviews of Modern Physics | 2007

Granular electronic systems

I. S. Beloborodov; A. V. Lopatin; V. M. Vinokur; K. B. Efetov

Granular metals are arrays of metallic particles of a size ranging usually from a few to hundreds of nanometers embedded into an insulating matrix. Metallic granules are often viewed as artificial atoms. Accordingly, granular arrays can be treated as artificial solids with programmable electronic properties. The ease of adjusting electronic properties of granular metals assures them an important role for nanotechnological applications and makes them most suitable for fundamental studies of disordered solids. This review discusses recent theoretical advances in the study of granular metals, emphasizing the interplay of disorder, quantum effects, fluctuations, and effects of confinement. These key elements are quantified by the tunneling conductance between granules


Physical Review Letters | 2001

Long-Range Proximity Effects in Superconductor-Ferromagnet Structures

F. S. Bergeret; A. F. Volkov; K. B. Efetov

g


Physical Review Letters | 2007

Quantum dots in graphene.

P. G. Silvestrov; K. B. Efetov

, the charging energy of a single granule


Physical Review Letters | 2006

Effect of disorder on transport in graphene.

I. L. Aleiner; K. B. Efetov

{E}_{c}


Physical Review Letters | 2001

Enhancement of the Josephson Current by an Exchange Field in Superconductor-Ferromagnet Structures

F. S. Bergeret; A. F. Volkov; K. B. Efetov

, the mean level spacing within a granule


Physical Review Letters | 2003

Odd triplet superconductivity in superconductor-ferromagnet multilayered structures.

A. F. Volkov; F. S. Bergeret; K. B. Efetov

\ensuremath{\delta}


Physical Review B | 2001

Josephson current in superconductor-ferromagnet structures with a nonhomogeneous magnetization

F. S. Bergeret; A. F. Volkov; K. B. Efetov

, and the mean electronic lifetime within the granule


Physical Review B | 2003

Coulomb effects in granular materials at not very low temperatures

K. B. Efetov; A. Tschersich

\ensuremath{\hbar}∕g\ensuremath{\delta}

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A. F. Volkov

Russian Academy of Sciences

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A. F. Volkov

Russian Academy of Sciences

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I. S. Beloborodov

California State University

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