K. B. Efetov
Ruhr University Bochum
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Featured researches published by K. B. Efetov.
Reviews of Modern Physics | 2005
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
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
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
F. S. Bergeret; A. F. Volkov; K. B. Efetov
g
Physical Review Letters | 2007
P. G. Silvestrov; K. B. Efetov
, the charging energy of a single granule
Physical Review Letters | 2006
I. L. Aleiner; K. B. Efetov
{E}_{c}
Physical Review Letters | 2001
F. S. Bergeret; A. F. Volkov; K. B. Efetov
, the mean level spacing within a granule
Physical Review Letters | 2003
A. F. Volkov; F. S. Bergeret; K. B. Efetov
\ensuremath{\delta}
Physical Review B | 2001
F. S. Bergeret; A. F. Volkov; K. B. Efetov
, and the mean electronic lifetime within the granule
Physical Review B | 2003
K. B. Efetov; A. Tschersich
\ensuremath{\hbar}∕g\ensuremath{\delta}