visual
visual

세미나

  • HOME
  • >
  • 소식
  • >
  • 세미나
장소 E6 #1501 
일시 Jan. 11th(Tue), 15:00 
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 일시 장소 연사 제목
338 5. 9(월),16:00  E6, #1501  김창영교수 (서울대)  Searching for new electronic properties in correlated material flatland
337 5. 23(월),16:00  E6, #1501  김준성교수 (postech 물리학과)  Novel electronic transport in topological van der Waals magnets
336 2011/09/03-12/06  E6, 1501  김용균교수(한양대) 외  Physics Colloquium : 2011 Fall file
335 Nov. 12 (Thu.) 4:00 PM  E6-2 1323  김영덕 (Young Duck Kim) 교수  2020 가을학기 광학분야 특별세미나
334 Oct. 10(Tue) 4PM  E6-2 #1323  김성웅 교수 (성균관대학교 에너지과학과)  Discovery of New 2D Materials with Diverse Physical Properties
333 2. 28(월),16:00  E6, #1501  김동규교수 (KAIST 물리학과)  Spin-based training of optical microscopes
332 4pm, 10th May  E6 1323  권혁준 (Korea Institute for Advanced Study, KIAS)  (광학분야 특별세미나)Testing quantum thermodynamics using quantum optics
331 5. 30(월), 16:00  E6, #1501  공수현교수 (고려대학교 물리학과)  Light manipulation using 2D layered semiconductors
330 2013/03/11-06/10  E6, 1501  강명수교수(KAIST) 외  Physics Colloquium : 2013 Spring
329 Jan. 18(Tue), 2pm-3pm  KI bldg. 5th fl. Room B501 & Zoom  YoungJu Jo (Stanford University)  Data-driven interrogation of biological dynamics: from subcellular interactions to neuronal networks in vivo file
328 Jun. 14 (Tue) 4PM  Seminar Room (#2502, 2nd fl.)  Young-Sik Ra, Université Pierre et Marie Curie  Photonic quantum network based on multimode squeezed vacuums and single-photon subtraction
327 Feb.15(Mon), 05:00PM  Zoom  Yoshichika Otani(Tokyo Univ.)  Magnetic Cluster Octupole Domain evolutation in chiral antiferromagnets file
326 2012/04/02, 4PM  E6, 1501  Yong Hee Jeong  A new route to ferroelectricity in magnetic spinels: a case of Co2MnO4
325 Dec.10(Thu), 01:55 PM  Zoom  Yin Wen (University of Tokyo)  Consistency of Boltzmann equation and light dark matter from inflaton decay
324 2016/09/05-12/12 4PM  Natual Scien Bldg.(E6)m #1501  Yeong Kwan Kim 외  Physics Colloquium : 2016 Fall file
323 Jan.28(Thu), 03:00PM  Zoom  Yaroslav Tserkovnyak (UCLA)  Topological Transport of Deconfined Hedgehogs in Magnets file
322 DEC. 26 (Wed), 04:00 PM  E6-1. 3rd fl. #3434  Y. Kim, A. Go, K. Hwang and E.-G. Moon  Informal Workshop on Topology and Correlation file
321 Jun 22(Tue) 17:00  Zoom webinar  Wei Han (Peking University, China)  Spintronics meets Quantum Materials file
320 Jun 8 (Tue), 10:00 AM  Zoom webinar  Toshihiko Baba (Yokohama National University, Japan)  Photonic crystal devices for sensing file
319 Sep. 14(Mon) 17:30~  Zoom webinar  Teruo Ono (Kyoto U. Japan)  KAIST Global Forum for Spin and Beyond (Third Forum) file