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CATEGORIES:Theory of Condensed Matter
SUMMARY:Topological Proximity Effects - Karyn Le Hur\, CNR
S and Ecole Polytechnique
DTSTART;TZID=Europe/London:20201022T140000
DTEND;TZID=Europe/London:20201022T150000
UID:TALK152182AThttp://talks.cam.ac.uk
URL:http://talks.cam.ac.uk/talk/index/152182
DESCRIPTION:We discuss the induction of new topological band s
tructures from proximity effects and entanglement.
We present how to engineer a p+ip topological sup
erconductor in quantum wires with spin-orbit coupl
ing from the vicinity of a reservoir with s-wave C
ooper pairing. Topological properties of energy ba
nds associated with a spin-1/2 representation can
be characterized from the reciprocal space and the
Bloch sphere. The topological Chern number of one
spin-1/2 model is known to be an integer. We high
light how to realize fractional topological phases
directly from the reciprocal space\, through the
proximity effect and entanglement between two Bloc
h spheres. We show the applicability of these rati
onal-valued Chern numbers in quantum circuits and
a correspondence with honeycomb bilayer systems de
veloping a nodal semimetallic ring at one Dirac po
int only.
LOCATION:Details of video conferencing will be distributed
nearer the time.
CONTACT:Jan Behrends
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