|일시||Jan. 11th(Tue), 15:00|
“Ultrafast optical studies on CDW collective modes of the Weyl-CDW (TaSe4)2I”
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.
 J. Gooth et al., Nature 575, 315 (2019).
 W. Shi et al., Nat. Phys. 17, 381 (2021).
 D. M. Nenno et al., Nat. Rev. Phys. 2, 682 (2020).
 Yu et al., Phys. Rev. B 104, 174406 (2021).
Contact: Eunjung Jo, (email@example.com)
|266||Oct. 18 (Tue.), 1:30 PM||1st fl. #1323(E6-2)||Dr. Chan-Ho Yang, Department of Physics, KAIST||"Visualization of oxygen vacancy in motion and the interplay with electronic conduction"|
|265||July 10 (Wed.), 04:00 PM-||Academic Cltural Complex (E9) 5층 스카이라운지||Prof. Sidney Nagel/Young-Kee Kim||Public Lectures|
|264||2015/08/04, 11PM||B501, Room Red, KI bldg. 5nd fl.||Dr. Eric Jin Ser Lee(Univ. of Manitoba, Canada)||Propagation of ultrasound through two- and three-dimensional strongly scattering media|
|263||Jun. 1(Wed) 10:30 AM||BK21 Conference Room (#1318, E6-2)||Dr. Noriaki Horiuchi, Editor, Nature Photonics||Welcome to Nature Photonics|
|262||October 15, 2020 (Thursday||CAPP Seminar Room #C303, Creation Hall (3F), KAIST Munji Campus||Prof. Gil-Ho Lee (POSTECH)||Graphene-based Josephson junction microwave bolometer|
|261||2015/03/13, 2PM||Connect Room, KI Bldg.||The 15th Innovative Workshop on Soft/Bio Materials|
|260||2015/12/09, 11AM||E4(KI Building), Connect room (2nd fl.)||Arjun G. Yodh (University of Pennsylvania)||Functional Imaging & Monitoring of Brain & Breast with Diffuse Light|
|259||2015/12/17, 11:00AM||E4(KI Building), Matrix Hall (2nd fl.)||Dr. Jung-Hoon Park (Purdue University)||Wavefront engineering for in-vivo Deep brain imaging|
|258||2015/07/23,1:30PM||E4, B401||Prof. Gilles Lérondel (Univ. of Technology of Troyes)||Enhanced ZnO based UV photonics and related applications|
|257||Apr. 13(Wed.) 10:30Am||E6 #1323/zoom||Mingu Kang (Max Planck POSTECH Korea Research Initiative)||Harnessing topology and correlations from singularities in 3d-kagome metals|
|»||Jan. 11th(Tue), 15:00||E6 #1501||Soyeun Kim(UIUC)||Ultrafast optical studies on CDW collective modes of the Weyl-CDW (TaSe4)2I|
|255||Jan. 26th (Tue), 13:00||E6 #1501||Dr. Hyojin Jung (NIMS)||An Introduction to Cohomology groups|
|254||Jan. 25th (Tue), 15:00||E6 #1501/online||Junhyun Lee (Rutgers, the State University of New Jersey)||Emulating twisted double bilayer graphene with a multiorbital optical lattice|
|253||10AM, 31th Mar.||E6 #1501/zoom||Dr. Samuel Begg (APCTP)||Weiss fields for Quantum Spin Dynamics|
|252||10AM, 29th Mar. / 13:30 PM, 30th Mar.||E6 #1501/zoom, E6 #2502/zoom||Dr. RYO HANAI (APCTP)||Non-reciprocal phase transitions|
|251||4pm, 28th April||E6 1323||유경식 (KAIST 전기및전자공학부)||(광학분야 특별세미나)Adiabaticity and symmetry in optical waveguide design|
|250||4pm, 14th April||E6 1323||신승우 (KAIST 물리학과)||(광학분야 특별세미나)Holographic tomography of dielectric tensors at optical frequency|
|249||4pm, 10th May||E6 1323||권혁준 (Korea Institute for Advanced Study, KIAS)||(광학분야 특별세미나)Testing quantum thermodynamics using quantum optics|
|248||4pm, 26th May||E6 1323||황민수 (Department of Physics, Korea University)||(광학분야 특별세미나)Topological photonic devices|
|247||Nov. 22th (Thur), 15:00||E6 Room(#1323)||Prof. Suprijadi Haryono||Experimental and Computational Study on Physical Properties based on Granular System|