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SUMMARY:Topological Insulators: a New Playground for Spintronics
DTSTART:20170301T083000
DTEND:20170301T093000
DTSTAMP:20260916T052313Z
UID:2dd25fb18a88a7a324b6e5cca119aee615e15d186ada728c541d4d94
CATEGORIES:Conferences - Seminars
DESCRIPTION:Dr Anna Isaeva\, Technische Universität Dresden\, Dresden\, G
 ermany\nControlled spin-resolved transport is the holy grail of spintronic
 s. A major breakthrough in condensed matter physics – the discovery of t
 opological phases of matter (Nobel Prize in Physics 2016) – has opened p
 erspectives to realize robust\, spin-polarized transport on the surface of
  peculiar semiconductors\, so called topological insulators (TIs). This ph
 enomenon is intimately connected to the symmetries of matter\, and it was 
 soon established that exotic transport pathways may also be realized\, for
  instance\, via crystal lattice symmetries (topological crystalline insula
 tors\, TCI) and even in bulk (Weyl semimetals). Versatility of topological
  phases\, which are not limited to any particular class of compounds with 
 certain “chemical” markings\, inspires the quest for new representativ
 es.\n\nIn pursuit of topological insulators\, we have focused on bismuth-r
 ich halides with layered and chain-like structures [1]\, and have identifi
 ed three families of candidate materials. The present talk will highlight 
 representatives of each group – Bi14Rh3I9 (3D weak TI) [2–4\, 8]\, Bi2
 TeI (3D weak TI and TCI) [5\,6] and Bi3TeI (“topological metal”) [6]\,
  and Bi4I4 (3D strong TI) [7] – studied in intense cooperation with RWTH
  Aachen (Germany)\; DIPC San-Sebastian (Spain)\; EPFL and Berkeley Nationa
 l Laboratory (USA) over the past five years. Meticulous synthesis and crys
 tal-growth optimizations were complemented by thorough crystal structure e
 lucidation and characterization of structural defects. Predictions of topo
 logical properties from first-principles calculations were consequently ve
 rified by ARPES\, STM/AFM experiments in case of Bi14Rh3I9 [8] and Bi4I4 [
 7]. Very recent high-pressure experiments on Bi4I4 unravel unexpected new 
 avenues [9].\n\nBio:\nAnna Isaeva has received her MSc and PhD in Material
 s Science and Inorganic Chemistry at Lomonosov Moscow State University\, R
 ussia (1999–2008\, group of Prof. Boris A. Popovkin). Her thesis compris
 ed synthesis optimization\, crystal growth\, structure characterization an
 d band-structure calculations of complex metal chalcogenides. During the P
 hD phase\, she stayed at Technische Universität Dresden\, Germany\, for 6
  months as a holder of the INTAS Young-Scientist-Fellowship. In 2009–201
 0 she conducted her postdoctoral research project at EMAT center (Electron
  microscopy for materials science)\, the University of Antwerp (group of P
 rof. Gustaaf Van Tendeloo) where she acquired expertise in modern TEM meth
 ods. Since mid 2010 she has been working as a research assistant at Techni
 sche Universität Dresden\, first as a co-worker for DFG-funded projects w
 ith a focus on band-structure calculations and real-space characterization
  of chemical bonding\, and later on as a principal investigator of project
 s dedicated to correlated and itinerant magnetism and topological insulato
 rs. She is currently leading the research topic on topological insulators 
 in the group of Prof. Michael Ruck and is finalizing her habilitation abou
 t the chemical aspects of these materials.
LOCATION:MED 2 1124 (Coviz2) http://plan.epfl.ch/?lang=fr&room=MED21124
STATUS:CONFIRMED
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