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SUMMARY: Planar Hall effect from the surface of topological insulators - D
 r. Satoshi Sasaki\, University of Leeds\, UK
DTSTART:20190612T130000Z
DTEND:20190612T140000Z
UID:TALK126295@talks.cam.ac.uk
CONTACT:Dr Kaveh Delfanazari
DESCRIPTION:A prominent feature of topological insulators (TI) is the surf
 ace states comprising of spin-nondegenerate massless Dirac fermions. Recen
 t technical advances have made it possible to address the surface transpor
 t properties of TI thin films by tuning the Fermi levels of both top and b
 ottom surfaces. In my talk\, I am going to talk about our recent discovery
  of a novel planar Hall effect (PHE) from the TI surface\, which results f
 rom an unknown resistivity anisotropy induced by an in-plane magnetic fiel
 d. This effect is observed in dual-gated devices of bulk-insulating Bi_{2
 −x}Sb_{x}Te_{3} thin films\, where the field-induced anisotropy presents
  a strong dependence on the gate voltage with a characteristic two-peak st
 ructure near the Dirac point. The origin of PHE is the peculiar time-rever
 sal-breaking effect of an in-plane magnetic field\, which anisotropically 
 lifts the protection of surface Dirac fermions from backscattering. The ob
 served PHE provides a useful tool to analyse and manipulate the topologica
 l protection of the TI surface.\n\n*Reference:*\n\nAA Taskin\, HF Legg\, F
  Yang\, S Sasaki\, Y Kanai\, K Matsumoto\, A Rosch\, Y Ando\, Nat. Commun.
 \, 8 (2017) 1340.\n
LOCATION:Mott Seminar Room (531)\, Cavendish Laboratory\, Department of Ph
 ysics
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