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SUMMARY:IMX Seminar Series - Topology and Chirality
DTSTART:20220228T131500
DTEND:20220228T141500
DTSTAMP:20260307T130014Z
UID:659feb67a79d492ede5371b1cd896f6446305eab09f783c9f48a61c9
CATEGORIES:Conferences - Seminars
DESCRIPTION:Prof. Claudia Felser\, Max-Planck-Institut\, Desden Germany\nT
 opology\, a well-established concept in mathematics\, has nowadays become 
 essential to describe condensed matter. At its core are chiral electron st
 ates on the bulk\, surfaces and edges of the condensed matter systems\, in
  which spin and momentum of the electrons are locked parallel or anti-para
 llel to each other. Magnetic and non-magnetic Weyl semimetals\, for exampl
 e\, exhibit chiral bulk states that have enabled the realization of predic
 tions from high energy and astrophysics involving the chiral quantum numbe
 r\, such as the chiral anomaly\, the mixed axial-gravitational anomaly and
  axions. Beyond Weyl and Dirac\, new fermions can be identified in compoun
 ds that have linear and quadratic 3-\, 6- and 8- band crossings that are s
 tabilized by space group symmetries. Crystals of chiral topological materi
 als CoSi\, AlPt and RhSi were investigated by angle resolved photoemission
  and show giant unusual helicoid Fermi arcs with topological charges (Cher
 n numbers) of ±2. In agreement with the chiral crystal structure two diff
 erent chiral surface states are observed. A quantized circular photogalvan
 ic effect is theoretically possible in Weyl semimetals. However\, in the m
 ultifold fermions with opposite chiralities where Weyl points can stay at 
 different energies\, a net topological charge can be generated.The potenti
 al for connecting chirality as a quantum number to other chiral phenomena 
 across different areas of science\, including the asymmetry of matter and 
 antimatter and the homochirality of life\, brings topological materials to
  the fore.\n\n1 Observation and control of maximal Chern numbers in a chir
 al topological semimetal\, Niels B.M. Schröter\, Samuel Stolz\, Kaustuv 
 Manna\, Fernando de Juan\, Maia G. Vergniory\, Jonas A. Krieger\, Ding Pei
 \, Pavel Dudin\, Timur K. Kim\, Cephise Cacho\, Barry Bradlyn\, Horst Borr
 mann\, Marcus Schmidt\, Roland Widmer\, Vladimir Strokov\, and Claudia Fel
 ser\, Science 369 (2020) 179\n2 Evidence for an axionic charge density wav
 e in the Weyl semimetal (TaSe4)2I\, Johannes Gooth\, Barry Bradlyn\, Shash
 ank Honnali\, Clemens Schindler\, Nitesh Kumar\, Jonathan Noky\, Yangpeng 
 Qi\, Chandra Shekhar\, Yan Sun\, Zhijun Wang\, Bogdan Andrei Bernevig\, Cl
 audia Felser\, Nature 575 (2019) 315–319\n\nBio: Claudia Felser studied
  chemistry and physics at the University of Cologne\, completing there bot
 h her diploma in solid state chemistry (1989) and her doctorate in physica
 l chemistry (1994). After postdoctoral fellowships at the Max Planck Insti
 tute in Stuttgart (Germany) and the CNRS in Nantes (France)\, she joined t
 he University of Mainz in 1996 as an assistant professor (C1) becoming a f
 ull professor there in 2003 (C4). She is currently Director at the Max Pla
 nck Institute for Chemical Physics of Solids in Dresden. In 2001 Felser re
 ceived Order of Merit (Landesverdienstorden) of the state Rheinland Pfalz 
 for the foundation of the first NAT-LAB for school students at the Univers
 ity Mainz with a focus in female school students. She is fellow of the IEE
 E Magnetic Society\, American Physical Society\, Institute of Physics\, Lo
 ndon\, CIFAR Canada and the Materials Research Society of India. In 2018\,
  she became a member of the Leopoldina\, the German National Academy of Sc
 iences\, and acatech\, the German National Academy of Science and Engineer
 ing. In 2011 and again in 2017\, she received an ERC Advanced grant. In 20
 19\, Claudia Felser was awarded the APS James C. McGroddy Prize for New Ma
 terials together with Bernevig (Princeton) and Dai (Hongkong). In 2020\, s
 he was elected to the United States National Academy of Engineering (NAE) 
 and in 2021 to the United States National Academy of Sciences (NAS). In 20
 22 she was awarded the Max Born Prize and Medal of DPG and IOP\, the Liebi
 g Medal of the Gesellschaft Deutscher Chemiker (GDCh) and the Wilhelm-Ostw
 ald-Medal of the Saxon Academy of Science. Her research foci are the desig
 n\, synthesis\, and physical characterization of new quantum materials\, i
 n particular\, Heusler compounds and topological materials for energy conv
 ersion and spintronics. \n 
LOCATION:https://epfl.zoom.us/j/68532296336?pwd=UXBrN1RBWHVFQjVjSko2NDF3S3
 Awdz09
STATUS:CONFIRMED
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