BEGIN:VCALENDAR
VERSION:2.0
CALSCALE:GREGORIAN
PRODID:UW-Madison-Physics-Events
BEGIN:VEVENT
SEQUENCE:3
UID:UW-Physics-Event-5166
DTSTART:20190926T160000Z
DURATION:PT1H0M0S
DTSTAMP:20260415T070618Z
LAST-MODIFIED:20190918T202230Z
LOCATION:5310 Chamberlin Hall
SUMMARY:Spin transport in ferromagnet-InSb nanowire quantum devices \,
  R. G. Herb Condensed Matter Seminar\, Vlad Pribiag\, University of Mi
 nnesota
DESCRIPTION:Topological excitations such as Majorana fermions provide 
 unique pathways to fault-tolerant quantum computing. Recent progress i
 n this direction has been enabled by proximity effects between non-sup
 erconducting materials and superconductors\; however\, further breakth
 roughs leading to topological quantum computation require developing n
 ew material systems that integrate semiconductors not only with superc
 onductors\, but also with epitaxial ferromagnets or antiferromagnets. 
 Currently\, Majorana devices based on semiconductors require applicati
 on of an external magnetic field to induce spin splitting and open a h
 elical gap – necessary to realize an odd-parity topological supercon
 ductor. However\, the presence of this magnetic field limits the robus
 tness of topological properties (by weakening the induced superconduct
 ivity). Moreover\, the stringent requirements on its orientation with 
 respect to the device greatly restrict the scalability of Majorana-bas
 ed quantum information systems. A promising path forward is to realize
  Majorana modes without an applied magnetic field by closely integrati
 ng ferromagnets or antiferromagnets with semiconductors and supercondu
 ctors. With this motivation\, we have been studying ballistic InSb nan
 owire devices with ferromagnetic contacts [1]. I will discuss the resu
 lts of magneto-transport measurements on these devices spanning from t
 he many-modes regime to few modes\, and will show that the magnetoresi
 stance displays hysteretic features across this entire range of conduc
 tance regimes. I will discuss possible physical mechanisms underlying 
 these observations\, as well as implications for the development of Ma
 jorana devices that could operate without the need for external magnet
 ic fields.
URL:https://www.physics.wisc.edu/events/?id=5166
END:VEVENT
END:VCALENDAR