장소 | #1323(E6-2. 1st fl.) |
---|---|
일시 | Nov. 16 (Wed), 4p.m. |
연사 | Dr. Heung-Sik Kim , University of Toronto |
Realizing Haldane Model in Fe-based Honeycomb Ferromagnetic Insulators
Nov. 16 (Wed), 4p.m., #1323(E6-2. 1st fl.)
Dr. Heung-Sik Kim , University of Toronto
The topological Haldane model (THM) on a honeycomb lattice is a prototype of systems hosting topological phases of matter without external fields. It is the simplest model exhibiting the quantum Hall effect without Landau levels, which motivated theoretical and experimental explorations of topological insulators and superconductors. Despite its simplicity, its realization in condensed matter systems has been elusive due to a seemingly difficult condition of spinless fermions with sublattice-dependent magnetic flux terms. While there have been theoretical proposals including elaborate atomic-scale engineering, identifying candidate THM materials has not been successful, and the first experimental realization was recently made in ultracold atoms. Here we suggest that a series of Fe-based honeycomb ferromagnetic insulators, AFe2(PO4)2 (A=Ba,Cs,K,La) possess Chern bands described by the THM. While BaFe2(PO4)2 fails to exhibit quantized Hall effect due to the filling of even and odd Chern bands, we predict that compounds with A=K,Cs,La have nontrivial bulk Chern numbers with well-defined gap, thereby enabling a solid state realization of THM.
Contact: MyungJoon Han, Physics Dept., (mj.han@kaist.ac.kr)
댓글 0
번호 | 일시 | 장소 | 연사 | 제목 |
---|---|---|---|---|
103 | Apr. 1(Fri.), 04:00 PM | Zoom webinar | Dr. Kayoung Lee (KAIST) |
High-field Electron Transport and Interaction Induced Phenomena in 2D Materials
![]() |
102 | 2015/11/24, 4PM | E6-2, #1323 | Dr. Kab-Jin Kim (Institute for Chemical Research, Kyoto University, Japan) | Topology-based understanding of spin dynamics in inhomogeneously magnetized systems |
101 | Jul. 08 (Fri.) 2PM | #1323(E6-2. 1st fl.) | Dr. Junhyun Lee, Harvard University | Electronic quasiparticles in the quantum dimer model |
100 | Oct. 18 (Tue.), 3PM | E6-2. 1st fl. #1323 | Dr. JunHo Suh, Korea Research Institute of Standards and Science | “Hybrid quantum systems with mechanical oscillators” |
99 | 2015/12/17, 11:00AM | E4(KI Building), Matrix Hall (2nd fl.) | Dr. Jung-Hoon Park (Purdue University) | Wavefront engineering for in-vivo Deep brain imaging |
98 | June 27 (Wed.), 13:30 PM | #1323, E6-2 | Dr. Jung Sik Park |
Magnetic reversal of artificial spin ice
![]() |
97 | July. 14 (Fri.), 3:00 PM | #1323 (E6-2. 1st fl.) | Dr. Jun Hyun Lee / University of Maryland |
Chiral anomaly in disordered Weyl semimetals
![]() |
96 | Nov. 1 (Fri.), 04:00 PM | E6-2. 1st fl. #1323 | Dr. Ju-Jin Kim |
Electron transport through weak-bonded contact metal with low dimensional nano-material
![]() |
95 | Sep. 27 (Fri.), 02:30 PM | E6-2. 1st fl. #1323 | Dr. Joon Sue Lee |
Spin-charge conversion in topological insulators for spintronic applications
![]() |
94 | Dec. 7 (Fri.), 04:00 PM | E6-2. 1st fl. #1323 | Dr. Joon Ho Jang |
Novel probes of interacting electrons in 2D systems
![]() |
93 | October 19 (Fri.), 10:00 AM | #1323, E6-2 | Dr. Jongsoo Yoo |
Energy conversion processes during magnetic reconnection in a laboratory plasma
![]() |
92 | Nov. 04 (Fri), 1:30 PM | E6-2. #1323(1st fl.) | Dr. Jonghyun Song, Department of Physics, Chungnam National University | Exotic phenomena at oxide LaAlO3/SrTiO3 hetero-interface and their applications |
91 | 2015/08/03,10:30AM | E6-2, #1323 (Seminar Room) | Dr. Jonghee Yoo (Fermi National Accelerator Laboratory, USA ) | Axion Search |
90 | Apr. 01 (Fri.) 4:15 PM | E6-2. 1st fl. #1501 | Dr. JONG SOO LIM, KIAS | Cotunneling drag effect in Coulomb-coupled quantum dots |
89 | December 3 (Tue.), 4:00 PM | #1323, E6-2 | Dr. Jong Mok Ok |
Toward Quantum Materials with Correlated Oxides
![]() |
88 | 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” |
87 | Dec. 8(Thu) 4p.m. | #1323(E6-2. 1st fl.) | Dr. Jinhyoung Lee, Hanyang University | Dynamical Resonance between Two Optical Cavities via Optomechanical Oscillator |
86 | Mar. 16 (Fri.), 02:30 PM | E6-2. 1st fl. #1323 | Dr. JinHee Kim |
산화물 다층박막에서의 다양한 물리현상
![]() |
85 | Sep. 27 (Fri.), 04:00 PM | E6-2. 1st fl. #1323 | Dr. Jindong Song |
0D/1D/2D/3D III-V materials grown by MBE for Optelectronics
![]() |
84 | Jun. 11 (Fri.), 02:30 PM | Online seminar | Dr. Jin Woong Cha(KRISS) |
Engineering sound waves and vibrations in multi-mode nanomechanical systems
![]() |