장소 | #1323(E6-2. 1st fl.) |
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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)
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번호 | 일시 | 장소 | 연사 | 제목 |
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공지 | 2019/09/18 - 12/5 | Seminar Room #1323 | Prof. David Schuster and etc. | Fall 2019: Physics Seminar Serises |
공지 | 2019/09/02 - 12/09 | Seminar Room 1501 | 이호성 박사 (한국표준과학연구원) and etc. | Fall 2019: Physics Colloquium |
104 | Apr. 28 (Thu.) 3PM | #2501(E6-2. 2nd fl.) | Dr. Chang Hee Sohn, SEOUL NATIONAL UNIVERSITY | Lattice/Spin/Charge Coupling in 5d Pyrochlore Cd2Os2O7 |
103 | Oct. 17th (Mon) 11:00 AM | #1323,(E6-2, 1st fl.) | Nguyen Quang Liem, Institute of Materials Science, VAST, Viettnam | IMS and examples of the studies on optoelectronic materials |
102 | October 4 (Thu.), 16:00 PM | #1323, E6-2 | Prof. Soo Jin Kim |
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101 | May 30 (Thu.), 16:00 PM | #1323, E6-2 | Prof. Chang-Hee Cho |
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100 | April 11 (Thu.), 16:00 PM | #1323, E6-2 | Prof. Joo-Hyoung Lee, GIST |
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99 | October 11 (Thu.), 16:00 PM | #1323, E6-2 | Prof. Joung-Real Ahn |
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98 | May 24 (Fri.), 16:00 PM | #1323, E6-2 | Prof. Soonjae Moon |
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97 | May 31 (Fri.), 11:00 AM | #1323, E6-2 | Prof. Guido Burkard |
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96 | October 19 (Fri.), 10:00 AM | #1323, E6-2 | Dr. Jongsoo Yoo |
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95 | October 15 (Mon.), 16:00 PM | #1323, E6-2 | Dr. Yongjoo Baek |
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94 | October 25 (Thu.), 4:00 PM | #1323, E6-2 | Dr. Gang Li |
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93 | May 9 (Wed.), 04:00 PM | #1323, E6-2 | Prof. Jong-Soo Rhyee |
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92 | June 4 (Tue.), 5:00 PM | #1323, E6-2 | Prof. Minsu Kim |
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91 | October 15 (Tue.), 16:00 PM | #1323, E6-2 | Prof. Pilkyung Moon |
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90 | May. 8th (Wed), 16:00 | E6 Room(#1323) | Jieun Lee |
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89 | May 9 (Thu.), 16:00 PM | #1323, E6-2 | Prof. Kwang Geol Lee |
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88 | May 9 (Thu.), 16:00 PM | #1323, E6-2 | Prof. Kwang Geol Lee |
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87 | May 311 (Thu.), 04:00 PM | #1323, E6-2 | Prof. Teun-Teun Kim |
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86 | November 1 (Thu.), 16:00 PM | #1323, E6-2 | Dr. KyeoReh Lee |
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