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SUMMARY:Long-lived non-equilibrium magnetoresistance in spin-orbit coupled
  systems - James Dann\, Cavendish Laboratory\, the University of Cambridge
DTSTART:20190130T140000Z
DTEND:20190130T150000Z
UID:TALK119425@talks.cam.ac.uk
CONTACT:Dr Kaveh Delfanazari
DESCRIPTION:Spin-orbit coupling can lead to many interesting effects\, suc
 h as the spin-Hall effect\, Edelstein effect\, topological insulators\, an
 d Majorana fermions. I will discuss what appears to be a novel effect in s
 pin-orbit coupled systems. Disordered alloys of gold and germanium show we
 ak anti-localisation (WAL) when the magnetic field is varied quasistically
 \, as is expected with a spin-orbit coupled system. However\, the magnetor
 esistance changes dramatically when the field is swept at a constant non-z
 ero rate\, with the resistance depending on both the sweep rate and the di
 rection of the sweep. These non-equilibrium resistance values are long-liv
 ed\, taking tens of seconds to revert to the equilibrium resistance. Intri
 guingly\, this behaviour is only seen in AC measurements\, not in DC measu
 rements. Similar results have been seen in other systems with spin-orbit c
 oupling. I will discuss these results\, ruling out several possible explan
 ations. Finally\, I will introduce a simple model which captures the main 
 features of the experimental results using the nature of the band structur
 e in spin-orbit coupled materials.
LOCATION:Mott Seminar Room (531)\, Cavendish Laboratory\, Department of Ph
 ysics
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