BEGIN:VCALENDAR
VERSION:2.0
CALSCALE:GREGORIAN
PRODID:UW-Madison-Physics-Events
BEGIN:VEVENT
SEQUENCE:1
UID:UW-Physics-Event-4622
DTSTART:20171005T150000Z
DURATION:PT1H0M0S
DTSTAMP:20260419T021842Z
LAST-MODIFIED:20170909T000953Z
LOCATION:5310 Chamberlin Hall
SUMMARY:Quantum dot chains as emulators of topological superconductors
 \, R. G. Herb Condensed Matter Seminar\, Sergey Frolov\, University of
  Pittsburgh
DESCRIPTION:Tunneling spectroscopy measurements on one-dimensional sup
 erconducting hybrid materials have revealed signatures of Majorana fer
 mions which are the edge states of a bulk topological superconducting 
 phase. We couple strong spin-orbit semiconductor InSb nanowires to con
 ventional superconductors (NbTiN\, Al) to obtain additional signatures
  of Majorana fermions and to explore the magnetic-field driven topolog
 ical phase transition. Specifically\, we map out the phase diagram of 
 the topological phase in the space of Zeeman energy and chemical poten
 tial\, and investigate the apparent closing and re-opening of the supe
 rconducting gap. We investigate how the topological superconducting ph
 ase would manifest in finite size systems\, by electrostatically split
 ting the wire into segments of varied length. By chaining up several s
 egments of a nanowire\, we are realizing a quantum simulator of the Ki
 taev chain with tunable on-site energies and couplings between the sit
 es\, a step towards quantum simulation with semiconductor nanostructur
 es.
URL:https://www.physics.wisc.edu/events/?id=4622
END:VEVENT
END:VCALENDAR