visual
visual

세미나

  • HOME
  • >
  • 소식
  • >
  • 세미나
날짜 2022-03-18 11:00 
연사  
장소 Online seminar 
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 연사 제목
공지 2025-02-24 16:00    2025년 봄학기 콜로키움 안내
공지 2025-02-27 16:00    2025년 봄 물리학과 특별세미나 (광학/응집물리 분야)
205 2019-06-17 10:30    Chiral Spintronics file
204 2015-07-15 14:00    Electronic and optical properties of titanate-based oxide superlattices
203 2016-09-29 16:00    Large-scale Silicon Photonic MEMS Switches
202 2017-03-24 16:00    Graphene based nano electronics and nano electromechanics; focusing on precise control of nano structures for studying accurate physical properties
201 2022-06-10 16:00    Fe5GeTe2의 나선형 자성특성과 자기저항의 전류밀도 의존성 연구 file
200 2025-01-08 16:00  Dr. SangEun Han  Quantum impurity model for two-stage multipolar ordering and Fermi surface reconstruction
199 2015-12-03 16:00    Hybrid solid state spin qubits in wide bandgap semiconductors
198 2017-06-02 16:00    Maxwell's demon in quantum wonderland file
197 2022-11-09 16:00    Radio Astronomy, Radio Interferometry, and Multi-wavelength Studies on Relativistic Jets
196 2023-05-03 16:00    Probing microscopic origins of axions by the chiral magnetic effect
195 2020-10-15 17:00    Time crystals, quasicrystals, and time crystal dynamics in the superfluid universe file
194 2022-03-31 10:00    Weiss fields for Quantum Spin Dynamics file
193 2022-03-29 10:00    Non-reciprocal phase transitions file
192 2024-05-16 14:30    [Astrophysics Seminar] Observational Cosmology with Superconducting Sensors
191 2024-05-30 10:00    Quasiperiodic Effects in Quasicrystals
190 2018-11-09 14:30    Moiré superlattices – from twisted bilayer graphene to quasicrystal file
189 2015-10-16 15:00    High Magnetic Fields to Probe the sub-eV range of Particle/Astroparticle Physics - From the OSQAR experiments at CERN up to new perspectives at LNCMI-Grenoble
188 2018-07-02 15:00    High Precision Magnetic Field Measurement for the Muon g-2 Experiment file
187 2016-06-01 10:30    Welcome to Nature Photonics
186 2025-04-22 16:00  Dr. Nanse Esaki (The University of Tokyo)  Spin Nernst and thermal Hall effects of topological triplons in quantum dimer magnets on the maple-leaf and star lattices file