visual
visual

세미나

  • 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
162 2019-11-01 14:30  E6-2. 1st fl. #1323  Squeezing the best out of 2D materials file
161 2018-12-07 16:00  E6-2. 1st fl. #1323  Novel probes of interacting electrons in 2D systems file
160 2018-06-01 11:00  E6-2. 1st fl. #1323  Topological phases in low-dimensional quantum materials file
159 2016-10-18 15:00  E6-2. 1st fl. #1323  “Hybrid quantum systems with mechanical oscillators”
158 2017-09-22 16:00  E6-2. 1st fl. #1323  Unexpected Electron-Pairing in Integer Quantum Hall Effect file
157 2019-09-27 16:00  E6-2. 1st fl. #1323  0D/1D/2D/3D III-V materials grown by MBE for Optelectronics file
156 2018-05-17 13:30  E6-2. 1st fl. #1323  Quantum Spin Liquid in Kitaev Materials file
155 2018-11-09 16:00  E6-2. 1st fl. #1323  Quantum sensing and imaging with diamond defect centers for nano-scale spin physics file
154 2018-12-27 16:00  E6-2. 1st fl. #1323  Quantum Innovation (QuIN) Laboratory file
153 2016-04-12 16:00  E6-2. 1st fl. #1323  Confinement of Superconducting Vortices in Magnetic Force Microscopy
152 2018-11-09 14:30  E6-2. 1st fl. #1323  Moiré superlattices – from twisted bilayer graphene to quasicrystal file
151 2017-04-28 14:30  E6-2. 1st fl. #1323  Hot electron generation at surfaces and its impact to catalysis and renewable energy conversion
150 2018-12-11 16:00  E6-2. 1st fl. #1323  Natural compact representation of Matsubara Green’s functions: applications to analytic continuation and quantum many-body simulations file
149 2017-09-22 13:00  E6-2. 1st fl. #1323  Superconductor-metal-insulator transition in thin Tantalum films file
148 2018-10-12 14:30  E6-2. 1st fl. #1323  Quantum Advantage in Learning Parity with Noise file
147 2017-05-12 13:30  E6-2. 1st fl. #1323  Topological Dirac insulator
146 2017-09-22 14:30  E6-2. 1st fl. #1323  Quantum Electronic Transport in Graphene Hybrid Nanostructures file
145 2019-11-01 16:00  E6-2. 1st fl. #1323  Electron transport through weak-bonded contact metal with low dimensional nano-material file
144 2019-09-27 14:30  E6-2. 1st fl. #1323  Spin-charge conversion in topological insulators for spintronic applications file
143 2018-03-16 16:00  E6-2. 1st fl. #1323  Van der Waals Heterostructures from Quantum Transport to Ultrafast Optoelectronics file