visual
visual

세미나

  • HOME
  • >
  • 소식
  • >
  • 세미나
날짜 2016-12-09 16:00 
연사  
장소 #1323(E6-2. 1st fl. 

Shift Charge and Spin Photocurrents in Dirac Surface States of Topological Insulator

 

Dr. Kun Woo Kim, KIAS

Dec. 9(Fri), 4p.m., #1323(E6-2. 1st fl.

The generation of photocurrent in condensed matter is of main interest for photovoltaic and opto-electronic applications. Shift current, a nonlinear photoresponse, has attracted recent intensive attention as a dominant player of bulk photovoltaic effect in ferroelectric materials. In three-dimensional topological insulators Bi2X3 (X: Te, Se), we find that Dirac surface states with a hexagonal warping term support shift current by linearly polarized light. Moreover, we study ‘shift spin current’ that arises in Dirac surface states by introducing time-reversal symmetry breaking perturbation. The estimate for the magnitudes of the shift charge and spin current densities are 0.13 I0 and 0.40 I0 (nA/m) for Bi2Te3 with the intensity of light I0 measured in (W/m2), respectively, which can offer a useful method to generate these currents efficiently.

 

Contact: MyungJoon Han, Physics Dept., (mj.han@kaist.ac.kr)

번호 날짜 연사 제목
공지 2025-02-24 16:00    2025년 봄학기 콜로키움 안내
공지 2025-02-27 16:00    2025년 봄 물리학과 특별세미나 (광학/응집물리 분야)
385 2019-04-11 16:00    Massive screening for cathode active materials using deep neural network file
384 2018-09-20 16:00    Toward Cancer Treatment Using Terahertz Radiation: Demethylation of Cancer DNA file
383 2018-09-20 16:00    Toward Cancer Treatment Using Terahertz Radiation: Demethylation of Cancer DNA file
382 2018-10-18 16:00    Applications of nonlinear optics for condensed matter researches file
381 2018-05-09 16:00    Recent advances in thermoelectric bulk composites file
380 2017-01-09 16:00    Topological Defects and Phase Transitions" file
379 2016-07-28 16:00    Low Dimensional Electrons: On the Road to Hybrid Quantum Systems
378 2019-04-23 16:00    From Mott physics to high-temperature superconductivity file
377 2022-07-21 16:00    Quintessential axions file
376 2019-11-14 16:00    Semi-classical model of polariton propagation file
375 2017-12-15 09:20    Workshop on Magnetism in Unconventional Superconductors 개최 file
374 2024-05-01 16:00    [High Energy Theory Seminar] Across the Mass Spectrum: Utilizing Small-Scale Structures to Probe Dark Matters
373 2019-11-07 16:00    Integrated quantum photonics with solid-state quantum emitters file
372 2018-05-29 16:00    Investigation on metal nanostructure/semiconductor junction and its applications file
371 2020-10-23 14:00    Plasmon spectroscopy of low-dimensional superconductors in fluctuating regime file
370 2025-02-25 14:00  Prof. Igor Di Marco  Dynamical mean-field theory for strongly correlated materials file
369 2024-05-16 16:00    [High Energy Theory Seminar] Conformal Collider Physics
368 2018-07-13 14:00    Loop Induced Single Top Partner Production and Decay at the LHC
367 2018-12-11 16:00    Natural compact representation of Matsubara Green’s functions: applications to analytic continuation and quantum many-body simulations file
366 2017-08-31 14:00    “Berry phase and nonlinear response: photocurrent in noncentrosymmetric insulators and Weyl semimetals” file