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
347 2015-12-03 16:00  E6-2, #1323  Hybrid solid state spin qubits in wide bandgap semiconductors
346 2022-06-10 16:00  E6-2. 1st fl. #1323  Fe5GeTe2의 나선형 자성특성과 자기저항의 전류밀도 의존성 연구 file
345 2017-03-24 16:00  #1323 (1st fl. E6-2)  Graphene based nano electronics and nano electromechanics; focusing on precise control of nano structures for studying accurate physical properties
344 2016-09-29 16:00  E6-2 #1323 (1st floor)  Large-scale Silicon Photonic MEMS Switches
343 2015-07-15 14:00  E6-2,1323  Electronic and optical properties of titanate-based oxide superlattices
342 2019-06-17 10:30  #1323, E6-2  Chiral Spintronics file
341 2019-04-19 16:00  E6-2. 1st fl. #1323  Graphene and hBN heterostructures file
340 2023-09-21 16:00  CAPP Seminar Room C303, Creation Hall, KAIST Munji Campus  [CAPP seminar] Axion Magnetic Resonance file
339 2023-10-11 16:00  E6-2, Rm2502  [High Energy Theory Seminar] Axion Magnetic Resonance
338 2016-01-26 14:00  E6-2, #1323  Electrochemistry on Nano- and Atomic Levels: Scanning Probe Microscopy Meets Deep Data
337 2019-03-29 14:30  E6-2. 1st fl. #1323  Epitaxial Multifunctional Oxide Thin Films for Novel Electronics file
336 2018-06-01 11:00  E6-2. 1st fl. #1323  Topological phases in low-dimensional quantum materials file
335 2019-10-29 16:00  #1323 (E6-2, 1st fl.)  Particles and Gravity via String Geometry file
334 2018-04-09 11:00  E6-2. 1st fl. #1323  Doublon-holon origin of the subpeaks at the Hubbard band edges file
333 2019-10-31 10:00  #1323 (E6-2, 1st fl.)  Kondo meets Hubbard: Impurity physics for correlated lattices file
332 2022-06-10 14:30  E6-2. 1st fl. #1323  Combinatorial strategy for condensed matter physics: study on rare earth hexaborides thin films file
331 2020-02-13 16:30  E6-6, #119  Enhanced Light-Matter Interactions in Graphene with Noble Metal Plasmonic Structures file
330 2019-11-20 16:00  #5302, E6-2  Correlation between superconducting transition temperature and critical current density in irradiated iron-based superconductors file
329 2019-11-05 16:00  #1323, E6-2  Study on nanomaterials by the development of ultrahigh resolution laser-photoelectron microscopy (PEEM) file
328 2021-12-03 14:30  Zoom webinar  Topological Spin Textures: Skyrmions and Beyond file