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)
374 2019-07-08 14:00    Ultrabroadband squeezed pulses and their relation to relativity file
373 2019-07-10 16:00    Public Lectures file
372 2019-07-16 16:00    2019 Physics Distinguished Lecture file
371 2019-07-21 12:00    Challenges and Opportunities in Theoretical Particle Physics 2019 file
370 2019-07-25 16:00    Band topology of twisted bilayer graphene file
369 2019-07-30 16:00    Dirac fermions and flat bands in correlated kagome metals file
368 2019-07-31 16:00    Features of ballistic superconducting graphene file
367 2019-08-01 14:00    Low-density Superconductivity in SrTiO3 Probed by Planar Tunneling Spectroscopy file
366 2019-08-06 16:00    Visualization of in-plane piezoresponse vector fields file
365 2019-08-14 16:00    Quantum Optics, at the heart of quantum metrology and quantum information file
364 2019-08-16 14:00    Multiferroic and Magnetoelectric Effects by Tailoring Interfacial Chemistry and Physics in Correlated Oxides file
363 2019-08-19 10:00    Tutorials on Multimode Quantum Optics in the Continuous Variable Regime file
362 2019-08-22 16:00    Physics and Applications in Nanoelectronics and Nonomechanics file
361 2019-08-27 16:00    Critical current properties of Fe-based superconductors file
360 2019-09-02 16:00    Fall 2019: Physics Colloquium file
359 2019-09-10 15:00    Two-Stage Kondo Effect file
358 2019-09-10 15:00    (2+1) D Duality Web from 3D Euclidean Lattice file
357 2019-09-18 16:00    Exploring Synthetic Quantum Matter in Superconducting Circuits file
356 2019-09-18 16:00    Fall 2019: Physics Seminar Serises file
355 2019-09-26 16:00    Entanglement Swapping with Autonomous Polarization-Entangled Photon-Pairs from Warm Atomic Ensemble file