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VERSION:2.0
CALSCALE:GREGORIAN
PRODID:UW-Madison-Physics-Events
BEGIN:VEVENT
SEQUENCE:0
UID:UW-Physics-Event-4284
DTSTART:20170127T213000Z
DURATION:PT1H0M0S
DTSTAMP:20240329T071708Z
LAST-MODIFIED:20170120T164216Z
LOCATION:2241 Chamberlin hall
SUMMARY:A New Spin on Superconductivity\, Physics Department Colloquiu
m\, Amir Yacoby\, Harvard University
DESCRIPTION:Nearly a hundred years after its discovery\, superconducti
vity remains one of the most intriguing phases of matter. In 1957 Bard
een\, Cooper and Schrieffer (BCS) presented their theory of supercondu
ctivity describing this state in terms of pairs of electrons arranged
in a spatially isotropic wave function with no net momentum and a spin
singlet configuration. Immediately thereafter\, a search began to fin
d materials with unconventional superconductivity where pairing deviat
es from conventional BCS theory.
\n
\nOne particular class of
unconventional superconductors involves pairs arranged in triplet rath
er than singlet configurations. Such superconductors may enable dissip
ationless transport of spin and may also give rise to elementary excit
ations that do not obey the conventional Fermi or Bose statistics but
rather have non-Abelian statistics where the exchange of two particles
transforms the state of the system into a new quantum mechanical stat
e.
\n
\nIn this talk I will describe some of our recent experi
ments that explore the proximity effect between a conventional superco
nductor and a semiconductor with strong spin-orbit interaction. Using
supercurrent interference\, we show that we can tune the induced super
conductivity continuously from conventional to unconventional that is
from singlet to triplet. Our results open up new possibilities for exp
loring unconventional superconductivity as well as new ways for detect
ing unconventional pairing in known materials.
URL:https://www.physics.wisc.edu/events/?id=4284
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