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SUMMARY:IMX Seminar Series - Atomic monolayers as two-dimensional topologi
 cal insulators
DTSTART:20201026T131500
DTEND:20201026T141500
DTSTAMP:20260509T054351Z
UID:e589d477a9ddb7febec527ddfc8831d99085bd4e8f475796afff19e8
CATEGORIES:Conferences - Seminars
DESCRIPTION:Prof. Ralph Claessen\, Würzburg University\, Germany\nTwo-dim
 ensional topological insulators (2D-TIs) are characterized by hosting spin
 -polarized conducting band states at their one-dimensional (1D) edges\, gi
 ving rise to the quantum spin Hall (QSH) effect. As pointed out in the sem
 inal work of Kane and Mele\, graphene would constitute the most simple rea
 lization of a QSH insulator if it were not for its almost negligible spin-
 orbit interaction. It has been suggested that going to heavier group IV mo
 nolayers (such as the Sn-derived "stanene") could remedy this problem\, bu
 t a convincing demonstration of such 2D TIs is still lacking. Recently it 
 has been found that going to the neighboring groups III and V in the Perio
 dic Table provides a promising alternative approach. Here I will discuss o
 ur recent photoemission (ARPES) and scanning tunneling microscopy (STM) st
 udies of such monolayer systems. Particular focus will be on the case of b
 ismuthene deposited on a SiC(0001) substrate\, which is identified as a la
 rge band-gap QSH insulator with almost atomically confined 1D edge states.
  Time permitting I will also address our recent discovery of possible topo
 logical behavior in triangular In monolayers on SiC.
LOCATION:Zoom https://epfl.zoom.us/j/95940364570
STATUS:CONFIRMED
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