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)
314 2020-12-23 10:00    Online workshop for Quantitative Phase Imaging file
313 2020-12-11 16:00    Atomic and electronic reconstruction at van der Waals interface in twisted 2D materials
312 2020-12-11 14:30    Antisymmetric interlayer exchange coupling in magnetic multilayers
311 2020-12-10 13:55    Consistency of Boltzmann equation and light dark matter from inflaton decay
310 2020-12-09 10:00    Searching for the QCD axion with the ARIADNE experiment file
309 2020-12-02 10:00    Recent progress in Axion Dark Matter eXperiment (ADMX) technology file
308 2020-11-26 16:00    2020 가을학기 광학분야 특별세미나(Light Engineering Beyond the Diffraction Limit)
307 2020-11-20 16:00    Coherent control of field gradient induced quantum dot spin qubits
306 2020-11-20 14:30    Lumpy Cooper pairs in an iron-based superconductor
305 2020-11-17 12:00    Quantum- & Nano-Photonics" 세미나 시리즈 file
304 2020-11-12 16:00    2020 가을학기 광학분야 특별세미나
303 2020-10-23 14:00    Plasmon spectroscopy of low-dimensional superconductors in fluctuating regime file
302 2020-10-16 16:00    Hidden room-temperature ferroelectricity in CaTiO3 revealed by a metastable octahedral rotation pattern file
301 2020-10-16 14:30    Nanoscale magnetic resonance detection towards nano MRI file
300 2020-10-15 17:00    Time crystals, quasicrystals, and time crystal dynamics in the superfluid universe file
299 2020-10-15 16:00    Graphene-based Josephson junction microwave bolometer file
298 2020-10-15 16:00    Towards resource-efficient and fault-tolerant quantum computation with nonclassical light
297 2020-10-09 09:00    Quantum Many-Body Simulation file
296 2020-09-28 17:30    KAIST Global Forum for Spin and Beyond(Fourth Forum) file
295 2020-09-24 09:00    (CAPP/IBS)Searching for Dark Matter with a Superconducting Qubit , Cryogenic Microwave Circuit Development at the NSTU file