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Seminar «Graphene meets a superconductor: A new approach to gate-tunable superconductivity»

Dr. Skvortsov Mikhail
January 31, 2014
12.00 – 13.30
Beijing – 1 Auditorium, China cluster (Skolkovo School of Management)

SEMINAR ABSTRACT:
Graphene is an atomically thin crystal with exceptional electrical properties that suggest new approaches to signal processing and computation. Inducing superconductivity in graphene, which intrinsically is a semi-metal, enables a unique combination of superconducting phase coherence and gate-tunability of graphene-based materials.
Several years ago Dr. Skvortsov pointed out that global phase coherence in graphene can be enforced by small superconducting islands dispersed over its area. Owing to a good contact between graphene and the islands, Cooper pairs readily penetrate into graphene and establish proximity-induced Josephson coupling between the islands. The superconducting gap and critical temperature in such a graphene-superconductor hybrid composite is controlled by the islands’ size and concentration. Importantly, the gap and critical temperature feature strong dependence on doping which is gate-tunable. At low temperatures the compound behaves as an inhomogeneous bulk superconductor. A magnetic field drives the system to a frustrated superconducting glass state. These predictions have been tested and verified in recent experiments employing a tin-graphene hybrid system.
He will also briefly discuss some other directions of he research that are relevant for modern superconducting device technologies, such as the interplay of superconductivity and disorder, nonequilibrium superconductivity, and Anderson localization in quantum wires.

SPEAKER INTRODUCTION:
Dr. Mikhail Skvortsov has got his master degree from the Moscow Institute of Physics and Technology in 1995. His further scientific career is closely related to the Landau Institute for Theoretical Physics, where he started as a graduate student (PhD, 1998) and is working presently as a senior research scientist.
Scientific interests of Mikhail Skvortsov lie in the field of contemporary low-temperature condensed matter physics, with particular emphasis on quantum-coherent phenomena in complex systems in the presence of disorder, interaction and fluctuations. M. Skvortsov has an experience of teaching master-level classes for more than 10 years.

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