visual
visual

세미나

  • HOME
  • >
  • 소식
  • >
  • 세미나
날짜 2024-02-16 10:00 
일시 Feb.16th(Fri) 10:00AM 
장소 E6, #1323 
연사 Hyeok-Jun Yang (Dep. of Physics, University of Notre Dame) 
물리학과에서는 아래와 같이 세미나를 개최하고자 하오니, 관심있는 분들의 많은 참석 부탁드립니다.
 
Date: 10:00 Am, 16th Feb. (Fri)
 
Venue: E6, #1323
 
Speaker: Hyeok-Jun Yang (Department of Physics, University of Notre Dame)
 
Title: Optical conductivity of superconducting states driven by Van Hove singularities
 
Abstract: 

In Van der Waals materials, the Van Hove singularity (VHS) enhances interaction effects and can drive a rich variety of collective orders and topological phases, including conventional and unconventional superconductivity. Although the diverging density of states and susceptibilities have been extensively studied, the VHS type such as the degree of divergence is often unclear in experiments. In this work, we theoretically show that the optical response in superconducting states can be used to experimentally infer the energy dispersion of relevant VHS. Our remark is that the current relaxation is related to the effective mass behavior so that the optical absorption intensity dramatically depends on the VHS type. Our study suggests the anisotropy of absorption spectra as a possible signature to distinguish and identify two types of VHS, conventional and higher-order VHS. 

 
 
번호 날짜 장소 제목
293 2020-09-14 17:30  Zoom webinar  KAIST Global Forum for Spin and Beyond (Third Forum) file
292 2020-09-11 14:00  zoom  SRC Seminar file
291 2020-08-25 20:00  Zoom webinar  KAIST Global Forum for Spin and Beyond (Second Forum) file
290 2020-08-17 20:00  Zoom webinar  Using magnetic tunnel junctions to compute like the brain file
289 2020-07-02 16:00  Zoom Video Conference Seminar  An irreversible qubit-photon coupling for the detection of itinerant microwave photons file
288 2020-02-20 16:00  #1323, E6-2  Unconventional superconductivity in the locally non-centrosymmetric heavy-fermion CeRh2As2 file
287 2020-02-13 16:30  E6-6, #119  Enhanced Light-Matter Interactions in Graphene with Noble Metal Plasmonic Structures file
286 2020-02-12 13:00  E6-2, #5318  From inflation to new weak-scale file
285 2020-01-17 16:00  #1323, E6-2  Symmetry Breaking and Topology in Superfluid 3He file
284 2019-12-27 15:00  #5318, E6-2  The superconducting order parameter puzzle of Sr2RuO4 file
283 2019-12-27 15:00  E6-2,#5318  The superconducting order parameter puzzle of Sr2RuO4 file
282 2019-12-18 16:00  #1323, E6-2  Road to Higher Tc Superconductivity file
281 2019-12-13 13:30  #1323, E6-2  Biophysics Mini-symposium at KAIST file
280 2019-12-13 13:00  #2501, E6-2  Computational Material Designs: Current Status and Future Directions file
279 2019-12-05 16:00  #1323, E6-2  Subwavelenth Photonic Devices: From Single Photon Sources to Solar Cell file
278 2019-12-03 16:00  #1323, E6-2  Toward Quantum Materials with Correlated Oxides file
277 2019-11-28 16:00  #1323, E6-2  Generation of coherent EUV emissions using ultrashort laser pulses file
276 2019-11-20 16:00  #5302, E6-2  Correlation between superconducting transition temperature and critical current density in irradiated iron-based superconductors file
275 2019-11-14 16:00  #1323, E6-2  Semi-classical model of polariton propagation file
274 2019-11-07 16:00  #1323, E6-2  Integrated quantum photonics with solid-state quantum emitters file