|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)
|140||10AM, 29th Mar. / 13:30 PM, 30th Mar.||E6 #1501/zoom, E6 #2502/zoom||Dr. RYO HANAI (APCTP)||Non-reciprocal phase transitions|
|139||10AM, 31th Mar.||E6 #1501/zoom||Dr. Samuel Begg (APCTP)||Weiss fields for Quantum Spin Dynamics|
|138||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|
|137||Aug. 1st(Mon), 10:00AM||E6 #1501 & Zoom||손상모 박사(Space Telescope Science Institute (STScI)||James Webb Space Telescope & OTE Commissioning|
|136||Jul. 14th (THU), 15:00||E6 #1501 & Zoom||Dr. Sunghun Kim(Institute of Natural Science, KAIST)||Pure two-dimensional quantum electron liquid and its phase transition|
|135||Jul. 14th (THU), 14:15||E6 #1501 & Zoom||Dr. Hyeong Jun LEE(Institute of Natural Science, KAIST)||Hund and electronic correlations in ruthenium-based systems|
|134||Jul. 14th (THU), 13:30||E6 #1501 & Zoom||Dr. Jahyun Koo(Institute of Natural Science, KAIST)||Electronic structure and anomalous transport properties of topological materials by first principle calculation|
|133||Jan. 26th (Tue), 13:00||E6 #1501||Dr. Hyojin Jung (NIMS)||An Introduction to Cohomology groups|
|»||Jan. 11th(Tue), 15:00||E6 #1501||Soyeun Kim(UIUC)||Ultrafast optical studies on CDW collective modes of the Weyl-CDW (TaSe4)2I|
|131||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|
|130||2015/07/23,1:30PM||E4, B401||Prof. Gilles Lérondel (Univ. of Technology of Troyes)||Enhanced ZnO based UV photonics and related applications|
|129||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|
|128||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|
|127||2015/03/13, 2PM||Connect Room, KI Bldg.||The 15th Innovative Workshop on Soft/Bio Materials|
|126||July 21, 2022 (Thu) 4:00 PM(KST)||CAPP Seminar Room C303, Creation Hall, KAIST Munji Campus||Prof. Jihn E. Kim (Kyoung Hee University)||Quintessential axions|
|125||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|
|124||Jun. 1(Wed) 10:30 AM||BK21 Conference Room (#1318, E6-2)||Dr. Noriaki Horiuchi, Editor, Nature Photonics||Welcome to Nature Photonics|
|123||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|
|122||July 10 (Wed.), 04:00 PM-||Academic Cltural Complex (E9) 5층 스카이라운지||Prof. Sidney Nagel/Young-Kee Kim||Public Lectures|
|121||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"|