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VERSION:2.0
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PRODID:UW-Madison-Physics-Events
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SEQUENCE:0
UID:UW-Physics-Event-8873
DTSTART:20240926T150000Z
DURATION:PT1H0M0S
DTSTAMP:20260413T171617Z
LAST-MODIFIED:20240826T215516Z
LOCATION:5310 Chamberlin
SUMMARY:Electron Interactions in Rashba Materials\, R. G. Herb Condens
 ed Matter Seminar\, Yasha Gindikin\, University of Minnesota
DESCRIPTION:We present a bunch of novel phenomena stemming from the pa
 ir spin-orbit interaction (PSOI)\, which does not rely on structure in
 version asymmetry but instead arises from Coulomb fields of interactin
 g electrons in materials with a strong Rashba effect. First\, PSOI can
  induce p-wave superconducting order without the need for any mediator
 s of attraction. Depending on the sign and strength of the PSOI coupli
 ng\, two distinct superconducting phases emerge in 3D systems\, analog
 ous to the A and B phases observed in superfluid He3. In contrast\, 2D
  systems exhibit p_x \\pm i p_y order parameter\, leading to the time-
 reversal-invariant topological superconductivity. Second\, a sufficien
 tly strong PSOI can induce ferromagnetic ordering. It is associated wi
 th a deformation of the Fermi surface\, which eventually leads to a Li
 fshitz transition from a spherical to a toroidal Fermi surface\, with 
 a number of experimentally observable signatures. Finally\, in suffici
 ently clean Rashba materials\,  ferromagnetism and p-wave superconduct
 ivity may coexist. This state resembles the A1 phase of He3\, yet it m
 ay avoid nodal points due to the toroidal shape of the Fermi surface.
URL:https://www.physics.wisc.edu/events/?id=8873
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