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UID:DSC-21980
DTSTART;TZID=Europe/Berlin:20250602T163000
SEQUENCE:1748842528
TRANSP:OPAQUE
DTEND;TZID=Europe/Berlin:20250602T173000
URL:https://dresden-science-calendar.de/calendar/de/detail/21980
LOCATION:MPI-PKS\, Nöthnitzer Straße 3801187 Dresden
SUMMARY:Claessen: Atomic monolayers as 2D topological quantum materials
CLASS:PUBLIC
DESCRIPTION:Speaker: Prof. Ralph Claessen\nInstitute of Speaker: Universit
 ät Würzburg\nTopics:\nPhysik\n Location:\n  Name: MPI-PKS ()\n  Street: 
 Nöthnitzer Straße 38\n  City: 01187 Dresden\n  Phone: + 49 (0)351 871 0\
 n  Fax: \nDescription: Confining electrons to two dimensions (2D) is known
  to enhance electronic correlations and promote non-trivial topological ph
 ases. Atomic monolayers on semiconductor substrates represent the ultimate
  2D limit of such confinement and thus have recently come into focus as \"
 third-generation 2D designer quantum materials\"\, following the examples 
 of graphene and monolayer transition metal dichalcogenides. Here I will fo
 cus on atomic monolayers as 2D topological insulators (2D-TIs) which host 
 1D metallic and spin-polarized edge states as hallmark of the quantum spin
  Hall (QSH) effect. My examples range from bismuthene (Bi/SiC(0001)) [1-3]
 \, the 2D-TI with the largest band gap realized to date\, to indenene (In/
 SiC(0001))\, a triangular lattice of In atoms with emergent honeycomb phys
 ics [4\,5]. Using ARPES as well as STM/STS we have studied their electroni
 c structure and especially their topological edge states\, revealing inter
 esting insights into their protection (or loss thereof) against single-par
 ticle backscattering. I will also demonstrate how circular dichroism in AR
 PES can serve as a tool to identify non-trivial topology in the bulk state
 s [6]. Finally\, I will discuss the stabilization of these monolayers in a
 mbient conditions via van der Waals capping [7\,8]\, paving the way toward
 s ex situ experiments and the realization of transport devices. [1] Scienc
 e 357\, 287 (2017) [2] Nat. Phys. 16\, 47 (2020) [3] Nat. Commun. 13\, 348
 0 (2022) [4] Nat. Commun. 12\, 5396 (2021) [5] arXiv:2503.11497 [6] Phys. 
 Rev. Lett. 132\, 196401 (2024) [7] Nat. Commun. 15\, 1486 (2024) [8] arXiv
 :2502.01592
DTSTAMP:20260421T183652Z
CREATED:20250510T053656Z
LAST-MODIFIED:20250602T053528Z
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