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BEGIN:VEVENT
DTSTAMP:20260624T173909Z
DTSTART;VALUE=DATE-TIME:20180220T130000
DTEND;VALUE=DATE-TIME:20180220T140000
SUMMARY:Dr Satoshi Sasaki (University of Leeds): Planar Hall effect from 
 the surface of topological insulators (P5.23)
TZID:Europe/London
UID:20180220-8a17841b612d0721016142991c1b2e7f@warwick.ac.uk
CREATED:20180129T154625Z
DESCRIPTION:A prominent feature of topological insulators (TI) is the sur
 face states comprising of spin-nondegenerate massless Dirac fermions. Re
 cent technical advances have made it possible to address the surface tra
 nsport properties of TI thin films by tuning the Fermi levels of both to
 p and bottom surfaces. In my talk\, I am going to talk about our recent 
 discovery of a novel planar Hall effect (PHE) from the TI surface\, whic
 h results from an unknown resistivity anisotropy induced by an in-plane 
 magnetic field. This effect is observed in dual-gated devices of bulk-in
 sulating Bi_{2−x}Sb_{x}Te_{3} thin films\, where the field-induced aniso
 tropy presents a strong dependence on the gate voltage with a characteri
 stic two-peak structure near the Dirac point. The origin of PHE is the p
 eculiar time-reversal-breaking effect of an in-plane magnetic field\, wh
 ich anisotropically lifts the protection of surface Dirac fermions from 
 backscattering. The observed PHE provides a useful tool to analyse and m
 anipulate the topological protection of the TI surface.
LOCATION:P523
CATEGORIES:Condensed Matter Physics Seminar
LAST-MODIFIED:20180219T102745Z
ORGANIZER;CN=Jon Duffy:
END:VEVENT
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