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)
265 2019-11-01 14:30    Squeezing the best out of 2D materials file
264 2019-04-19 14:30    A family of finite-temperature electronic phase transitions in graphene multilayers file
263 2015-11-06 16:30    Topological Dirac line nodes in centrosymmetric semimetals
262 2018-03-16 16:00    Van der Waals Heterostructures from Quantum Transport to Ultrafast Optoelectronics file
261 2018-03-16 16:00    Van der Waals Heterostructures from Quantum Transport to Ultrafast Optoelectronics file
260 2022-08-09 14:00    Quantum biology in fluorescent protein: a new model system to study quantum effects in biology file
259 2016-05-13 13:30    Aperiodic crystals in low dimensions
258 2018-04-11 16:00    Non-Gaussian states of multimode light generated via hybrid quantum information processing file
257 2025-07-03 14:00  Dr. Young-Gwan Choi (Max Planck Institute )  Quantum sensing with NV centers: nanoscale magnetometry newfile
256 2017-05-12 13:30    Topological Dirac insulator
255 2022-05-13 16:00    High-fidelity iToffoli gate for fixed-frequency superconducting qubits file
254 2022-06-10 11:00    Record-quality two-dimensional electron systems file
253 2018-04-11 13:30    Probing 3D Structure and Physical Properties of Materials at the Single-Atom Level file
252 2018-10-15 16:00    Universal properties of macroscopic current-carrying systems file
251 2016-09-02 16:00    Quantum Electrical Transport in Topological Insulator Nanowires
250 2016-09-02 14:30    Nanoscale Thermal Physics: Seebeck Effect and Nanoscale Friction
249 2023-12-14 16:00    Superconducting qubits for large-scale quantum computers file
248 2023-04-13 11:00    [High Energy Theory Seminar]Noninvertible Gauss Law and Axions
247 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 file
246 2015-12-01 16:00    Introducing extra dimensions to spectroscopic studies of advanced quantum materials