• HOME
  • >
  • 소식
  • >
  • 세미나
날짜 2022-03-18 11:00 
일시 March 18(Fri.) 11:00 
장소 Online seminar 
연사 Dr. Dirk Wulferding (IBS-Center for Correlated Electron Systems, Seoul National University, Seoul) 
1. Date / Time 
  - March 18, 2022 
  - 11:00 AM (KST)
2. ZOOM (Only online)
3. Speaker
    - Dr. Dirk Wulferding (IBS-Center for Correlated Electron Systems, Seoul National University, Seoul)
4. Talk Title
    - Illuminating exotic states of matter: Raman spectroscopy as an experimental tool to characterize quantum spin liquids 
5. Abstract
   -  Quantum spin liquids are paradigmatic examples of long-range entangled quantum states that host fractionalized excitations and may realize non-abelian anyonic quantum statistics. These states can emerge in systems with magnetic correlations that are restricted in dimensionality and in coordination, and that are characterized by a small quantum spin number [1]. While this concept is strikingly simple, so far only a few materials exist that are considered as good candidates for quantum spin liquid ground states. A major challenge is that these states evade any classical long-range order, thereby lacking any clear experimental fingerprints. Adding to this challenge is that oftentimes only microscopically small samples can be synthesized, thus limiting possible experimental characterization probes. 
    Raman spectroscopy is a method sensitive to magnetic excitations in both triplet and singlet sector, and therefore sensitive to fractionalized spinon and Majorana fermionic excitations that emerge from quantum spin liquid ground states [2]. In my talk, I will review how we characterize the ground states of various Heisenberg antiferromagnets on the kagome lattice, and of Kitaev spin liquids using Raman spectroscopy at high magnetic fields. Our data suggest that in vicinity to quantum criticality Kitaev magnets may host non-abelian Majorana bound states [3]. 
[1] see, e.g., Savary, et al., Rep. Prog. Phys. 80, 016502 (2017). 
[2] Wulferding, et al., JPCM 32, 043001 (2020). 
[3] Wulferding, et al., Nat. Commun. 11, 1603 (2020)
0221_카이스트 물리학과(응집물리)포스터-최종.jpg


번호 날짜 장소 제목
공지 2022-11-25 11:00  E6-2 #1323  [Update 세미나영상](응집물리 세미나) DMFT+ NRG: From models to real materials, from local to nonlocal correlations
97 2022-01-18 14:00  KI bldg. 5th fl. Room B501 & Zoom  Data-driven interrogation of biological dynamics: from subcellular interactions to neuronal networks in vivo file
96 2022-01-25 15:00  E6 #1501/online  Emulating twisted double bilayer graphene with a multiorbital optical lattice file
95 2022-01-26 13:00  E6 #1501  An Introduction to Cohomology groups file
94 2022-02-28 16:00  E6, #1501  Spin-based training of optical microscopes
93 2022-03-07 16:00  E6, #1501  Climate Physics and Modelling(우리말강의)
92 2022-03-14 16:00  E6, #1501  Quantitative phase imaging and artificial intelligence: label-free 3D imaging, classification, and inference
» 2022-03-18 11:00  Online seminar  (응집물리 세미나) Illuminating exotic states of matter: Raman spectroscopy as an experimental tool to characterize quantum spin liquids file
90 2022-03-21 16:00  E6, #1501  Multi-wavelength Studies on Relativistic Jets from Gamma-ray Bright Active Galactic Nuclei
89 2022-03-25 11:00  E6-1 #1323  (응집물리 세미나) Hund's metallicity in ruthenate systems file
88 2022-03-28 16:00  E6, #1501  Ultimate-density atomic semiconductor via flat bands
87 2022-03-29 10:00  E6 #1501/zoom, E6 #2502/zoom  Non-reciprocal phase transitions file
86 2022-03-31 10:00  E6 #1501/zoom  Weiss fields for Quantum Spin Dynamics file
85 2022-03-31 16:00  online  (광학분야 특별세미나)Ultrafast time-resolved spectroscopy in topological materials
84 2022-04-01 16:00  Zoom webinar  High-field Electron Transport and Interaction Induced Phenomena in 2D Materials file
83 2022-04-04- 16:00  E6, #1501  New paradigms in Quantum Field Theory
82 2022-04-08 11:00  E6-1 #1323  (응집물리 세미나) Flat-surface-assisted physical phenomena occurring in single crystal metal thin film file
81 2022-04-11 16:00  E6, #1501  Emergence of Statistical Mechanics in Quantum Systems
80 2022-04-13 10:30  E6 #1323/zoom  Harnessing topology and correlations from singularities in 3d-kagome metals
79 2022-04-14 16:00  E6 1323  (광학분야 특별세미나)Holographic tomography of dielectric tensors at optical frequency
78 2022-04-15 11:00  Online seminar  (응집물리 세미나) First-principles studies of polar oxides and their applications file