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SUMMARY:IMX Colloquium - Designer Quantum Materials from Carbon
DTSTART:20261109T131500
DTEND:20261109T141500
DTSTAMP:20261006T104802Z
UID:8a5df3b5cb9002caa15223a675829120d3ee20aa5d83babd714c8a60
CATEGORIES:Conferences - Seminars
DESCRIPTION:Prof. Roman Fasel\, EMPA\, Zürich\nAtomically precise carbon 
 nanostructures offer a new route to quantum systems built from the bottom 
 up. By combining molecular design\, on-surface synthesis and scanning prob
 e microscopy\, we can control atomic structure\, electronic states and mag
 netic interactions within the same platform.\nIn this talk\, I will follow
  the path from bottom-up synthesized graphene nanoribbons [1\,2] to open-s
 hell nanographenes [3] and designer quantum spin systems [4]. I will discu
 ss how atomic structure can determine electronic topology and how molecula
 r spins can be coupled into well-defined quantum chains. Recent examples i
 nclude Haldane chains [4]\, alternating-exchange spin chains [5] and antif
 erromagnetic Heisenberg chains [6]\, where collective and fractional excit
 ations can be probed directly at the atomic scale.\nMore broadly\, this wo
 rk illustrates a materials-science strategy in which structure\, functiona
 lity and interactions are programmed at the level of molecular building bl
 ocks. Rather than optimizing properties in an existing material\, the aim 
 is to design the material and its quantum behavior together. Atomically pr
 ecise carbon nanostructures therefore provide a model platform for explori
 ng how synthesis\, structure and emergent functionality can be linked in a
  predictive way\, with implications for the future design of low-dimension
 al electronic\, magnetic and quantum materials.\n\n	J. Cai\, P. Ruffieux\,
  R. Jaafar\, et al.\, Nature 466\, 470–473 (2010).\n	F. Xiang\, Y. Gu\, 
 A. Kinikar\, et al.\, Nat. Chem. 17\, 1356–1363 (2025).\n	S. Mishra\, D.
  Beyer\, K. Eimre\, et al.\, Nat. Nanotechnol. 15\, 22–28 (2020).\n	S. M
 ishra\, G. Catarina\, F. Wu\, et al.\, Nature 598\, 287–292 (2021).\n	C.
  Zhao\, G. Catarina\, J.-J. Zhang\, et al.\, Nat. Nanotechnol. 19\, 1789-1
 795 (2024).\n	C. Zhao\, L. Yang\, J. C. G. Henriques\, et al.\, Nat. Mater
 . 24\, 722–727 (2025).\n\nBio: Roman Fasel is a leading scientist in the
  field of atomically precise carbon nanostructures and surface-based quant
 um materials. He received his Ph.D. in Physics from the University of Frib
 ourg in 1996 and then carried out postdoctoral research at La Trobe Univer
 sity in Melbourne and the Fritz Haber Institute in Berlin before joining E
 mpa. Today\, he heads Empa’s nanotech@surfaces Laboratory and is Adjunct
  Professor at the University of Bern. He pioneered the bottom-up synthesis
  of graphene nanoribbons\, establishing on-surface synthesis as a major ne
 w direction in nanoscience\, and has since extended this work to topologic
 al states\, open-shell nanographenes and quantum spin chains.
LOCATION:MXF 1 https://plan.epfl.ch/?room==MXF%201
STATUS:CONFIRMED
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