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 2025-04-29 10:00  Dr. Yeonju Go (Brookhaven National Laboratory)  Exploring the Hottest Matter in the Universe: Quark-Gluon Plasma through Hard Probes and Artificial Intelligence
공지 2025-05-01 16:00  Dr. Inwook Kim (Lawrence Livermore National Laboratory)  BSM Physics Search with Quantum Sensors
공지 2025-02-24 16:00    2025년 봄학기 콜로키움 안내
공지 2025-02-27 16:00    2025년 봄 물리학과 특별세미나 (광학/응집물리 분야)
492 2022-11-18 14:30    Kondo cloud condensation in a highly-doped semiconductor metal file
491 2018-12-26 16:00    Brane-like defect in 3D toric code file
490 2019-07-31 16:00    Features of ballistic superconducting graphene file
489 2018-07-12 17:00    The MilliQan Experiment: Search for Milli-Charged Particles at the LHC
488 2016-12-09 13:30    Entanglement area law in strongly-correlated systems
487 2023-11-23 16:00    Deciphering the Enigma of Quantum Materials by X-ray Scattering and Spectroscopy
486 2019-10-16 16:00    Emergent black holes and monopoles from quantum fields file
485 2022-07-14 13:30    Electronic structure and anomalous transport properties of topological materials by first principle calculation
484 2016-11-24 16:00    Harmonic oscillator physics with single atoms in a state-selective optical potential
483 2015-09-07 15:00    Advanced Optical Materials and Devices at NRL
482 2021-05-14 16:00    Spatial and temporal separation of environmental dephasing sources from solid-state quantum emitters file
481 2016-04-12 16:00    Confinement of Superconducting Vortices in Magnetic Force Microscopy
480 2017-04-28 14:30    Hot electron generation at surfaces and its impact to catalysis and renewable energy conversion
479 2015-12-11 15:45    Dynamical mean field theory studies on heavy fermion system
478 2023-10-19 11:00    Emergent functionalities of iridium oxide films with different growth orientation file
477 2023-06-26 11:00    Quantum computing on magnetic racetracks with flying domain wall qubits
476 2019-04-19 11:00    First-principles studies of semiconductors for solar cell applications file
475 2021-06-11 14:30    Engineering sound waves and vibrations in multi-mode nanomechanical systems file
474 2019-09-27 16:00    0D/1D/2D/3D III-V materials grown by MBE for Optelectronics file