Interplay between Crossed Andreev Reflection and Disorder.
Channel: Taras Mogilyuk
Date: 2014-05-21

A.Zaikin (Lebedev Inst., Moscow & Forschungszentrum,
Karlsruhe), 22 may 2009.
Interplay between Crossed Andreev Reflection and Disorder: Zero-Bias Anomaly and Charge Imbalance Peak.
We analyze non-local effects in electron transport across
three-terminal normal-superconducting-normal (NSN) structures.
Subgap electrons entering S-electrode from one N-metal may
form Cooper pairs with their counterparts penetrating from an-
other N-metal. This phenomenon of crossed Andreev reflec-
tion (CAR) enables direct experimental realization of entangle-
ment between electrons from spatially separated N-terminals.
Combined with normal scattering at SN interfaces and disorder, CAR yields non-trivial behavior of the non-local conduc-
tance which we evaluate non-perturbatively at arbitrary inter-
face transmissions. In particular, at low energies we predict
strong enhancement of non-local conductance due to disorder-
induced quantum interference of electrons in both N-metals. We
also find that at intermediate temperatures non-local resistance
exhibits a well pronounced peak which originates from a trade-
off between charge imbalance and Andreev reflection. Our predictions are in a good agreement with recent experimental observations.
Lebedev Inst., Moscow & Forschungszentrum, Karlsruhe
zaikin@int.fzk.de
Автор видео: Томилин Константин Александрович старший научный сотрудник Отдела истории физико-математических наук ИИЕТ РАН,
кандидат физико-математических наук.
4 th International Sakharov Conference on Physics.