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)
474 2017-09-26 11:00    Time-resolved ARPES study of Dirac and topological materials
473 2017-10-10 16:00    Discovery of New 2D Materials with Diverse Physical Properties
472 2017-11-03 14:30    Quantum Resistor-Capacitor Circuit with Majorana Edge States file
471 2017-11-03 16:00    Expedition to the Kitaev Quantum Spin Liquid: Hunting for Majorana fermions file
470 2017-11-08 13:00    “Emergent exotic quasiparticles in quantum spin liquids” file
469 2017-11-28 16:00    Physics after the lab and the desk: Your work in PRL file
468 2017-12-13 13:30    KAIST-KIAS Joint Workshop in Theoretical Sciences 개최 file
467 2017-12-14 15:00    Exploring the Universe via GWs in the era of multi-messenger astronomy
466 2017-12-15 09:20    Workshop on Magnetism in Unconventional Superconductors 개최 file
465 2018-02-12 15:00    The recent result of XMASS Experiment
464 2018-03-16 14:30    산화물 다층박막에서의 다양한 물리현상 file
463 2018-03-16 16:00    Van der Waals Heterostructures from Quantum Transport to Ultrafast Optoelectronics file
462 2018-04-06 10:00    Entanglement and thermalization in many-body systems: recent progress file
461 2018-04-09 11:00    Doublon-holon origin of the subpeaks at the Hubbard band edges file
460 2018-04-11 13:30    Probing 3D Structure and Physical Properties of Materials at the Single-Atom Level file
459 2018-04-11 16:00    Non-Gaussian states of multimode light generated via hybrid quantum information processing file
458 2018-04-13 10:00    Quantum meets Mechanics: from Quantum Information to Fundamental Research file
457 2018-05-09 16:00    Recent advances in thermoelectric bulk composites file
456 2018-05-11 14:30    Disordered Floquet topological insulators file
455 2018-05-11 16:00    암페어 단위 재정의와 단전자 펌프 소자 개발 file