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VERSION:2.0
CALSCALE:GREGORIAN
PRODID:UW-Madison-Physics-Events
BEGIN:VEVENT
SEQUENCE:2
UID:UW-Physics-Event-7955
DTSTART:20221110T160000Z
DTEND:20221110T170000Z
DTSTAMP:20260414T153412Z
LAST-MODIFIED:20221107T173213Z
LOCATION:5310 Chamberlin
SUMMARY:Scanning tunneling spectroscopy of unconventional superconduct
 ors\, R. G. Herb Condensed Matter Seminar\, Pavlo Sukhachov\, Yale
DESCRIPTION:Motivated by recent experimental observations of unconvent
 ional superconductivity in twisted bilayer and trilayer graphenes\, we
  develop a theory describing the differential conductance between a no
 rmal STM tip and a 2D superconductor with an arbitrary gap structure. 
 Our analytical scattering theory accounts for Andreev reflections\, wh
 ich become prominent at larger transmission between the tip and the su
 perconductor. Exploiting the dependence of Andreev reflection on the r
 elative position of the STM tip with respect to the lattice symmetry p
 oints\, we show that the structure of the superconducting gap can be e
 xtracted by combining weak- and strong-tunneling limits of differentia
 l conductance. Furthermore\, the theory incorporates a tip-induced sca
 ttering potential within the 2D material\, which allows us to describe
  subgap resonances.
URL:https://www.physics.wisc.edu/events/?id=7955
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