9,016 research outputs found
Superconducting proximity effect and Majorana fermions at the surface of a topological insulator
We study the proximity effect between an s-wave superconductor and the
surface states of a strong topological insulator. The resulting two dimensional
state resembles a spinless p_x+ip_y superconductor, but does not break time
reversal symmetry. This state supports Majorana bound states at vortices. We
show that linear junctions between superconductors mediated by the topological
insulator form a non chiral 1 dimensional wire for Majorana fermions, and that
circuits formed from these junctions provide a method for creating,
manipulating and fusing Majorana bound states.Comment: 4 pages, 3 figures, published versio
Resonant tunneling of interacting electrons in a one-dimensional wire
We consider the conductance of a one-dimensional wire interrupted by a
double-barrier structure allowing for a resonant level. Using the
electron-electron interaction strength as a small parameter, we are able to
build a non-perturbative analytical theory of the conductance valid in a broad
region of temperatures and for a variety of the barrier parameters. We find
that the conductance may have a non-monotonic crossover dependence on
temperature, specific for a resonant tunneling in an interacting electron
system.Comment: 4 pages. 2 figure
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