visual
visual

세미나

  • HOME
  • >
  • 소식
  • >
  • 세미나
날짜 2016-04-28 15:00 
연사  
장소 #2501(E6-2. 2nd fl.) 

Lattice/Spin/Charge Coupling in 5d Pyrochlore Cd2Os2O7

 

Apr. 28 (Thu.) 3PM, #2501(E6-2. 2nd fl.)
Dr. Chang Hee Sohn, SEOUL NATIONAL UNIVERSITY

 

We investigated strong lattice/spin/charge coupling in 5d pyrochlore Cd2Os2O7 by using optical spectroscopy. In the first part of the presentation, I’ll show strong effect of magnetic ordering on the charge dynamics of Cd2Os2O7. In this compound, we observe that all-in/all-out antiferromagnetic ordering induces a Lifshitz-type metal-insulator transition that magnetic ordering gradually annihilates the Fermi surface. In the second part of the talk, I’ll present strong spin-lattice coupling in Cd2Os2O7. We observed large renormalization of phonon frequencies below all-in/all-out antiferromagnetic ordering temperature, which can be understood in terms of modulation of Heisenberg exchange interaction and single ion anisotropy. Relevance to expected novel phenomena and future work will be discussed.

 

Contact: Eun Gook Moon, Physics Dept., (egmoon@kaist.ac.kr)

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)
305 2022-01-12 11:00    Spectroscopic study of trapped ions towards probing dark matter and new physics file
304 2019-09-10 15:00    (2+1) D Duality Web from 3D Euclidean Lattice file
303 2022-01-25 15:00    Emulating twisted double bilayer graphene with a multiorbital optical lattice file
302 2019-07-21 12:00    Challenges and Opportunities in Theoretical Particle Physics 2019 file
301 2024-03-13 16:00    [High-Energy Theory Seminar] The Schwarzschild Black Hole from Perturbation Theory to all Orders
300 2019-08-06 16:00    Visualization of in-plane piezoresponse vector fields file
299 2012-02-13 16:00    Physics Colloquium : 2012 Spring
298 2016-06-01 16:00    Laboratory experiments relevant to mesospheric clouds, Saturn’s rings & astrophysical jets
297 2023-03-22 16:00    (High Energy Theory Seminar) Boltzmann or Bogoliubov? A Case of Gravitational Particle Production
296 2019-07-03 15:00    Many-body quantum electrodynamis (QED) with atoms and photons: A new platform for quantum optics" file
295 2023-01-12 14:40    JILA 1D Wannier-Stark optical lattice clock file
294 2018-07-26 14:00    Inflation in String Theory and Backreaction file
293 2018-07-26 14:00    Inflation in String Theory and Backreaction file
292 2023-08-29 16:00    [High Energy Theory Seminar] Towards string loop corrections in Calabi-Yau orientifold compactifications.
291 2024-10-30 14:30    [Seminar Invitation] Mario Cuoco (CNR-SPIN, c/o University of Salerno, Fisciano, Italy) / 2024.10.30. 14:30 / E6-2, #3441
290 2020-08-17 20:00    Using magnetic tunnel junctions to compute like the brain file
289 2020-08-25 20:00    KAIST Global Forum for Spin and Beyond (Second Forum) file
288 2025-03-10 16:00  Marko Rancic (University of Luxembourg)  Quantum computing for physics and optimization problems file
287 2024-07-10 16:00    [High Energy Theory Seminar] The Weak Gravity Conjecture in Perturbative String Theory
286 2023-06-14 16:00    [High-Energy Theory Seminar]Vertex algebras and extended operators in 4d N=2 SCFTs