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 |
---|---|---|---|---|
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 |
82 | 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
![]() |
81 | September 18(Wed.), 16:00PM | #1323, E6-2 | Prof.David Schuster |
Exploring Synthetic Quantum Matter in Superconducting Circuits
![]() |
80 | October 29 (Tue.), 14:30 PM | #1323, E6-2 | Prof. Jörg Wrachtrup |
Quantum sensing
![]() |
79 | September 20 (Thu.), 16:00 | #1323, E6-2 | Prof. Joo-Hiuk Son |
Toward Cancer Treatment Using Terahertz Radiation: Demethylation of Cancer DNA
![]() |
78 | April 4 (Thu.), 16:00 PM | #1323, E6-2 | Prof. Su-Hyun Gong |
Chiral spin-photon interaction at nanoscale
![]() |
77 | July 30 (Tue), 4:00 PM | #1323, E6-2 | Dr. Mingu Kang |
Dirac fermions and flat bands in correlated kagome metals
![]() |
76 | October 18 (Thu.), 16:00 PM | #1323, E6-2 | Prof. Jongseok Lee |
Applications of nonlinear optics for condensed matter researches
![]() |
75 | June 17 (Mon.), 10:30 AM | #1323, E6-2 | Dr. See-Hun Yang |
Chiral Spintronics
![]() |
74 | Apr.19 (Fri.), 11:00 AM | #1323, E6-2 | Dr. Ji-Sang Park |
First-principles studies of semiconductors for solar cell applications
![]() |
73 | November 8 (Thu.), 16:00 PM | #1323, E6-2 | 이종완 박사 |
Conformality lost
![]() |
72 | December 5 (Thu.), 16:00 PM | #1323, E6-2 | Prof. Soon-Hong Kwon |
Subwavelenth Photonic Devices: From Single Photon Sources to Solar Cell
![]() |
71 | April 23 (Tue.), 4:00 PM | #1323, E6-2 | Prof. Johan Chang |
From Mott physics to high-temperature superconductivity
![]() |
70 | October 17 (Thu.), 16:00 PM | #1323, E6-2 | Prof. Namkyoo Park |
Top down manipulation of Waves : From Metamaterials, Correlated Disorder, Quantum Analogy, to Digital Processing
![]() |
69 | Oct. 25 (Fri), 15:00 ~ | #1323, E6-2 | Daesu Lee,Junwoo Son,MyungJoon Han ,Siheon Ryee,Eun-Gook Moon |
Physics Seminar
![]() |
68 | September 5 (Wed.), 16:00 PM | #1323, E6-2 | Dr. Dirk Wulferding |
Shining a light on fractional excitations
![]() |
67 | November 21 (Wed.), 15:00 PM | #1323, E6-2 | Prof. Seongshik Oh |
Engineering topological quantum physics at the atomic scale
![]() |
66 | November 5 (Tue.), 4:00 PM | #1323, E6-2 | Dr. Shik Shin |
Study on nanomaterials by the development of ultrahigh resolution laser-photoelectron microscopy (PEEM)
![]() |
65 | June 27 (Wed.), 13:30 PM | #1323, E6-2 | Dr. Jung Sik Park |
Magnetic reversal of artificial spin ice
![]() |
64 | November 28 (Thu.), 16:00 PM | #1323, E6-2 | Prof. Kyung Taec Kim |
Generation of coherent EUV emissions using ultrashort laser pulses
![]() |
63 | April 26 (Fri.), 4:00 PM | #1323, E6-2 | Dr. Soonwon Choi |
Robust Quantum Metrology using Strongly Interacting Spin Ensembles and Quantum Convolutional Neural Network
![]() |