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SUMMARY:Selective Contact and Patterning of Topological Surface States by 
 Interfacing with Trivial and Ferromagnetic Insulators - Ms. Ankita S Anirb
 an\, Cavendish Laboratory\, University of Cambridge
DTSTART:20181107T140000Z
DTEND:20181107T150000Z
UID:TALK114691@talks.cam.ac.uk
CONTACT:Dr Kaveh Delfanazari
DESCRIPTION:Topological insulators (TIs) are a novel class of material whi
 ch host helical surface states with exciting and unique electronic propert
 ies. They can provide insights into new physics and also pave the way for 
 potential spintronic applications. Much work has been done to identify and
  characterise these surface states\, but in order to utilise them towards 
 multifunctional devices\, we need a way to control exchange gap opening in
  a tailored way and pattern them accordingly.\n\n     We present results f
 rom devices which enable selective contact and patterning of topological s
 urface states. We interface a TI with a ferromagnetic insulator to open up
  a gap in the Dirac cone\, in an effort to have independent contact to the
  top and bottom surface states of a single TI film\, enabling the characte
 risation and utilisation of the two surface states separately. We also stu
 dy heterostructures with two TI layers separated by a trivially insulating
  tunnel barrier\, allowing for a way of probing the dispersion relation of
  TIs using spin and momentum resolved tunnelling.
LOCATION:Mott Seminar Room (531)\, Cavendish Laboratory\, Department of Ph
 ysics
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