Shift Charge and Spin Photocurrents in Dirac Surface States of Topological Insulator
2016.12.07 19:28
| 장소 | #1323(E6-2. 1st fl. |
|---|---|
| 일시 | Dec. 9(Fri), 4p.m. |
| 연사 | Dr. Kun Woo Kim, KIAS |
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)
댓글 0
| 번호 | 일시 | 장소 | 연사 | 제목 |
|---|---|---|---|---|
| 공지 | 2019/03/21 - 5/30 | Seminar Room #1323 | Dr. Hyangtag Lim (KIST) and etc. | Spring 2019: Physics Seminar Serises |
| 공지 | 2019/02/25 - 06/03 | Seminar Room 1501 | 양용수 교수 (Prof. Yongsoo Yang, KAIST) and etc. | Spring 2019: Physics Colloquium |
| 97 | Apr. 28 (Fri.), 04:00 PM | #1323 (E6-2. 1st fl.) | Dr. Minkyung Jung Research Institute, DGIST | Carbon nanotubes coupled to superconducting impedance matching circuits |
| 96 | July 30 (Tue), 4:00 PM | #1323, E6-2 | Dr. Mingu Kang |
Dirac fermions and flat bands in correlated kagome metals
 |
| 95 | Nov. 3 (Fri.), 2:30 PM | #1323 (1st fl., E6-2.) | Dr. MinChul Lee(Department of Applied Physics, Kyung Hee Univ.) |
Quantum Resistor-Capacitor Circuit with Majorana Edge States
|
| 94 | Feb. 1 (Wed.), 2p.m. | #1323(E6-2. 1st fl.) | Dr. Michihisa Yamamoto, Department of Applied Physics, The University of Tokyo | Quantum electron optics using flying electrons |
| 93 | 2015/11/23, 1:30PM | E6-2, #1323 | Dr. Michael Park (Stanford University) | What's Beyond the Standard Model? Lessons from Run I and what might come in Run II |
| 92 | Jul. 08 (Fri.) 11:00 AM | #1323(E6-2. 1st fl.) | Dr. Michael Lawler(Binghampton Univ. / Cornell Univ.) | Isostatic magnetism |
| 91 | May 19, 2016 (Thur.) 3PM | May 19, 2016 (Thur.) 3PM, | Dr. Michael Betz, CERN | The CERN Resonant WISP Search: Development, Results and Lesson-Learned |
| 90 | 2015/10/15, 10AM | E6-2, 5th fl. #5318 | Dr. Mark D. Bird (Florida State University) | Development of Large-Bore, High Field Magnets at the NHMFL |
| 89 | Mar. 24 (Fri.), 2:30 PM | #1323 (1st fl. E6-2). | Dr. MahnSoo Choi | Topological Dynamics |
| 88 | October 26 (Fri.), 4:00 PM | #1323, E6-2 | Dr. Kyusung Hwang |
Coexisting triple-point and nodal-line topological magnons and thermal Hall effect in pyrochlore iridates
|
| 87 | 2015/07/16, 4PM | E6-2, 1318 | Dr. Kyunghan Hong(MIT) | Next-generation ultrafast laser technology for nonlinear optics and strong-field physics |
| 86 | November 1 (Thu.), 16:00 PM | #1323, E6-2 | Dr. KyeoReh Lee |
Direct holography from a single snapshot
|
| 85 | 2016/03/11 1:30 PM | E6-2. 1st fl. #1501 | Dr. Kwon Park | Topological phases of matter in nonequilibrium: Topology of the Wannier-Stark ladder |
| 84 | 2015/12/11, 1:30PM | E6-2, #1323 | Dr. KwangYong Choi (Chung-Ang University) | Quantum spin liquid in the 1/3 depleted triangular lattice Ba3(Ru1-xIrx)Ti2O9 |
| » | Dec. 9(Fri), 4p.m. | #1323(E6-2. 1st fl. | Dr. Kun Woo Kim, KIAS | Shift Charge and Spin Photocurrents in Dirac Surface States of Topological Insulator |
| 82 | May. 11 (Fri.), 02:30 PM | E6-2. 1st fl. #1323 | Dr. Kun Woo Kim |
Disordered Floquet topological insulators
|
| 81 | May 31 (Tue.) 4 PM | #1323(E6-2, 1st fl.) | Dr. Kimin Kim, KAIST | Understanding 3D tokamak physics towards advanced control of toroidal plasma |
| 80 | Apr. 01 (Fri.) 2:30 PM | E6-2. 1st fl. #1501 | Dr. KICHEON KANG, Chonnam National University | Interference of single charged particles without a loop and dynamic nonlocality |
| 79 | Nov. 11th(Fri), 1:30 p.m. | #1323(E6-2. 1st fl.) | Dr. Keun Su Kim, POSTECH | Bandgap Engineering of Black Phosphorus |
| 78 | November 29 (Thu.), 16:00 PM | #1323, E6-2 | Dr. Kee suk Hong |
양자 칸델라 실현을 위한 단일 광자 발생장치 개발
|