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 |
---|---|---|---|---|
372 | April 26 (Tue), 4PM | #1323(1st Floor. E6-2) | Dr. Myung-Ho Bae, Korea Research Institute of Standards and Science | Transport spectroscopy for electronic bands in carbon-based nanomaterials with weak-bond contacts |
371 | Nov. 1st (Tue), 10:30AM | #1323(E6-2 1st fl.) | Dr. Gadi Eisenstein, Technion | Time scale dependent dynamics in InAs/InP quantum dot gain media |
370 | Jun 1 (Wed) 4 PM | #1323(E6-2 1st fl.) | Kil-Byoung Chai, Caltech | Laboratory experiments relevant to mesospheric clouds, Saturn’s rings & astrophysical jets |
369 | Oct. 27th(Thu) 4PM | #1323(E6-2) | Dr. 이 강 희, KAIST, Mechnical Engineering | Terahertz Metal Optics |
368 | May 16, 2016 (Mon) 4PM | #1323(E6-2, 1st Fl.) | Dr. Daniel Bowring , Fermi National Accelerator Laboratory | Tuning microwave cavities with biased nonlinear dielectrics for axion searches |
367 | May 19 (Thu) 4PM | #1323(E6-2, 1st fl.) | Dr. Heedeuk Shin, POSTECH | Nonlinear/quantum optical effect in silicon nano-photonics |
366 | Sep. 22, 2016(Thu), 3:30 PM | #1323(E6-2, 1st fl.) | Dr. Haiyang Yan (Institute of Nuclear Physics and Chemistry) | Polarized 3He, Polarized Neutrons and New Interactions beyond the Standard Model |
365 | Jun. 16 (Thu) 4PM | #1323(E6-2, 1st fl.) | Hyochul Kim, Samsung Advanced Institute of Technology | Quantum information processing using quantum dots and photonic crystal cavities |
364 | Sep. 22, 2016(Thu), 3:30 PM | #1323(E6-2, 1st fl.) | Dr. Haiyang Yan (Institute of Nuclear Physics and Chemistry) | Polarized 3He, Polarized Neutrons and New Interactions beyond the Standard Model |
363 | May 31 (Tue.) 4 PM | #1323(E6-2, 1st fl.) | Dr. Kimin Kim, KAIST | Understanding 3D tokamak physics towards advanced control of toroidal plasma |
» | 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 |
361 | Apr. 19(Tue.), 2PM | #1323(E6-2. 1st fl.) | Prof. Mark Koepke, Department of Physics and Astronomy, West Virginia University, USA | Nonlocal collisional electron transport in partially ionized plasma generation, structure, and stability |
360 | Dec. 8(Thu) 4p.m. | #1323(E6-2. 1st fl.) | Dr. Jinhyoung Lee, Hanyang University | Dynamical Resonance between Two Optical Cavities via Optomechanical Oscillator |
359 | Jul. 28 (Thu.) 4PM | #1323(E6-2. 1st fl.) | Prof. Johannes Pollanen, Jerry Cowen Chair of Experimental Physics at Michigan State University | Low Dimensional Electrons: On the Road to Hybrid Quantum Systems |
358 | Mar. 2nd (Thu), 4:00 p.m | #1323(E6-2. 1st fl.) | Dr. Jonathan Denlinger, Lawrence Berkeley National Lab | “Progress in the comparison of ARPES to DMFT for d and f strongly correlated electron systems” |
357 | Dec. 9(Fri), 1:30 p.m. | #1323(E6-2. 1st fl.) | Dr. Jae Yoon Cho, POSTECH | Entanglement area law in strongly-correlated systems |
356 | Jul. 08 (Fri.) 2PM | #1323(E6-2. 1st fl.) | Dr. Junhyun Lee, Harvard University | Electronic quasiparticles in the quantum dimer model |
355 | Nov. 29(Tue) 4p.m. | #1323(E6-2. 1st fl.) | Dr. SungBin Lee, KAIST | Symmetry Protected Kondo Metals and Their Phase Transitions |
354 | Nov. 24(Thu) 4p.m. | #1323(E6-2. 1st fl.) | Dr. Jai-Min Choi, Chonbuk National Univiersity | Harmonic oscillator physics with single atoms in a state-selective optical potential |
353 | Jul. 08 (Fri.) 11:00 AM | #1323(E6-2. 1st fl.) | Dr. Michael Lawler(Binghampton Univ. / Cornell Univ.) | Isostatic magnetism |