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DTSTART:20160118T113000
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URL:https://murmitoyen.com/events/vanille/udem/detail/644596-what-are-topol
 ogical-insulators-good-for-n-yong-p-chen-purdue
LOCATION:Université de Montréal - Pavillon J.-Armand-Bombardier\, 5155\, 
 chemin de la rampe \, Montréal\, QC\, Canada\, H3T 2B2
SUMMARY:What are topological insulators good for?  – Yong P. Chen\, Purdu
 e
DESCRIPTION:Yong P. Chen\, Associate Professor of Physics and Astronomy\, 
 Associate Professor of Electrical and Computer Engineering\, Mail: 525 No
 rthwestern Ave\, Dept. of Physics\, Purdue University\, West Lafayette IN 
 47907
\nTopological insulators (TI) have recently attracted a lot of inter
 ests in both solid state physics and nanoelectronics community. These mate
 rials are semiconductors (band insulators) in the bulk (with “negative b
 andgap”)\, but have “topologically protected” conducting surfaces wi
 th spin-polarized\, graphene-like Dirac electrons\, promising a large numb
 er of exotic electronic and optical properties. But what are these materia
 ls really good for\, and what may be some of the first practical device ap
 plications of topological insulators? In this talk\, I will review the key
  electronic properties and device potentials of TIs. I will present our re
 cent experimental demonstration of the most intrinsic TI so far (with no m
 easureable bulk conduction – realizing a 3D material whose conductance d
 oes not depend on thickness and comes only from its surface\, some even at
  room temperature)\, along with some of the most salient electronic transp
 ort signatures of TI’s spin-helical\, Dirac fermion “topological surfa
 ce states”\, such as the “half-integer quantum Hall effect”\, and th
 e “spin-momentum locking” detected by direct electrical injection and 
 detection of spin-polarized surface current.  I will discuss some example
 s of potential devices applications of TIs in spintronics and energy conve
 rsion (eg. thermoelectrics).
\n 
\nReferences:
\n
\n
\nYong P. Chen\, Pro
 c. SPIE 8373\, 83730B (2012)
\nY. Xu et al.\, Nature Physics 10\, 956 (201
 4)\; Y. Xu et al.\, arXiv:1511.04597 (2015)
\nJ. Tian et al. Solid State C
 ommunications 191\, 1 (2014)\; J.Tian et al.\, Scientific Reports 5\, 1429
 3 (2015)
\nL. A. Jauregui et al.\, Scientific Reports 5\, 8452 (2015)\; L.
  A. Jauregui et al.\, Nature Nanotechnology\, in press\, arxiv:1503.00685 
 (2015)
\n
\n
\n Site web du groupe du Prof. Chen
\nCette conférence est 
 présentée par le RQMP Versant Nord du Département de physique de l'
 Université de Montréal et le Département de génie physique de Polyte
 chnique Montréal.
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