visual
visual

세미나

  • HOME
  • >
  • 소식
  • >
  • 세미나
날짜 2022-01-11 15:00 
일시 Jan. 11th(Tue), 15:00 
장소 E6 #1501 
연사 Soyeun Kim(UIUC) 

 

Physics Seminar

 

 

 

 

Ultrafast optical studies on CDW collective modes of the Weyl-CDW (TaSe4)2I

 

 

Soyeun Kim

Department of Physics,

Univ. Illinois at Urbana-Champaign (UIUC)

 

Jan. 11th (Tue), 15:00, E6 #1501

 

 

(TaSe4)2I provides an excellent platform to explore topology, lattice, and charge degrees of freedom. It is a non-magnetic Weyl semimetal with a quasi-1D charge-density wave phase transition (TC ~ 260 K) on its structurally chiral lattice. Because the pairs of Weyl fermions are coupled by a CDW modulation, the phase part of the CDW collective mode is suggested to follow the axion electrodynamics described by θE·B [1,2]. As a result, exciting phenomena such as negative magnetoresistance, quantized photogalvanic and piezomagnetic effects have been proposed [1,3,4]. In this talk, we will investigate the CDW collective modes of (TaSe4)2I using ultrafast optical tools of THz emission and THz-pump birefringence spectroscopy. The experimental results will be discussed and compared to the theoretically suggested magnetoelectric effects in the Weyl-CDW system.

[1] J. Gooth et al., Nature 575, 315 (2019).
[2] W. Shi et al., Nat. Phys. 17, 381 (2021).
[3] D. M. Nenno et al., Nat. Rev. Phys. 2, 682 (2020).
[4] Yu et al., Phys. Rev. B 104, 174406 (2021).

 

 

Contact: Eunjung Jo, (jojo@kaist.ac.kr)

 

번호 날짜 장소 제목
291 2019-07-08 14:00  E6, #1322  Ultrabroadband squeezed pulses and their relation to relativity file
290 2019-07-10 16:00  Academic Cltural Complex (E9) 5층 스카이라운지  Public Lectures file
289 2019-07-16 16:00  Rm. 1323 (E6-2)  2019 Physics Distinguished Lecture file
288 2019-07-21 12:00  E6-2,# 5318  Challenges and Opportunities in Theoretical Particle Physics 2019 file
287 2019-07-25 16:00  E6-2, #1323  Band topology of twisted bilayer graphene file
286 2019-07-30 16:00  #1323, E6-2  Dirac fermions and flat bands in correlated kagome metals file
285 2019-07-31 16:00  E6-2, #1323  Features of ballistic superconducting graphene file
284 2019-08-01 14:00  E6 Room(#1323)  Low-density Superconductivity in SrTiO3 Probed by Planar Tunneling Spectroscopy file
283 2019-08-06 16:00  E6 Room(#1323)  Visualization of in-plane piezoresponse vector fields file
282 2019-08-14 16:00  Rm. 1323, E6  Quantum Optics, at the heart of quantum metrology and quantum information file
281 2019-08-16 14:00  E6 Room(#1323)  Multiferroic and Magnetoelectric Effects by Tailoring Interfacial Chemistry and Physics in Correlated Oxides file
280 2019-08-19 10:00  Rm. 1322, E6-2  Tutorials on Multimode Quantum Optics in the Continuous Variable Regime file
279 2019-08-22 16:00  #1323, E6-2  Physics and Applications in Nanoelectronics and Nonomechanics file
278 2019-08-27 16:00  Rm. 1323, E6  Critical current properties of Fe-based superconductors file
277 2019-09-02 16:00  Seminar Room 1501  Fall 2019: Physics Colloquium file
276 2019-09-10 15:00  E6-2. 1st fl. #1323  Two-Stage Kondo Effect file
275 2019-09-10 15:00  #2502, E6-2  (2+1) D Duality Web from 3D Euclidean Lattice file
274 2019-09-18 16:00  #1323, E6-2  Exploring Synthetic Quantum Matter in Superconducting Circuits file
273 2019-09-18 16:00  Seminar Room #1323  Fall 2019: Physics Seminar Serises file
272 2019-09-26 16:00  #1323, E6-2  Entanglement Swapping with Autonomous Polarization-Entangled Photon-Pairs from Warm Atomic Ensemble file