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
286 2023-06-01 16:00  E6-2, #5301  Hall viscosity and topological phenomena
285 2017-06-02 16:00  #1323 (E6-2. 1st fl.)  Maxwell's demon in quantum wonderland file
284 2017-06-02 14:30  E6-2. 1st fl. #1323  Quasiparticle Interference and Fourier transform scanning tunneling spectroscopy in WTe2 (Weyl semimetal) file
283 2018-06-18 10:00  E6-2. 2nd fl. #2502  Rydberg electromagnetically induced transparency and microwave-to-optical conversion using Rydberg atoms file
282 2016-06-16 16:00  #1323(E6-2, 1st fl.)  Quantum information processing using quantum dots and photonic crystal cavities
281 2016-06-14 16:00  Seminar Room (#2502, 2nd fl.)  Photonic quantum network based on multimode squeezed vacuums and single-photon subtraction
280 2021-06-11 16:00  Online seminar  Pseudogap in surface-doped black phosphorus file
279 2021-06-11 14:30  Online seminar  Engineering sound waves and vibrations in multi-mode nanomechanical systems file
278 2022-06-10 11:00  Online seminar  Record-quality two-dimensional electron systems file
277 2022-06-10 16:00  E6-2. 1st fl. #1323  Fe5GeTe2의 나선형 자성특성과 자기저항의 전류밀도 의존성 연구 file
276 2022-06-10 14:30  E6-2. 1st fl. #1323  Combinatorial strategy for condensed matter physics: study on rare earth hexaborides thin films file
275 2016-06-01 10:30  BK21 Conference Room (#1318, E6-2)  Welcome to Nature Photonics
274 2023-06-01 16:00  E6-2 #1323  (광학분야 세미나)Quantum sensing using a squeezed light from hot Rb vapor
273 2018-06-01 11:00  E6-2. 1st fl. #1323  Topological phases in low-dimensional quantum materials file
272 2021-06-08 10:00  Zoom webinar  Photonic crystal devices for sensing file
271 2019-06-28 14:00  E6-2, #1322  1st Research-exchange meeting of computational material physics file
270 2019-06-24 11:00  E6-2, #1323  Topological photonic anomalies file
269 2021-06-22 17:00  Zoom webinar  Spintronics meets Quantum Materials file
268 2023-06-22 16:00  E6-2,1323  [High Energy Physics Seminar] The Branes Behind Generalized Symmetry Operators
267 2016-06-01 16:00  #1323(E6-2 1st fl.)  Laboratory experiments relevant to mesospheric clouds, Saturn’s rings & astrophysical jets