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 |
80 | 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
![]() |
79 | 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 |
78 | 2016/03/11 4 PM | E6-2. 1st fl. #1501 | Dr. Tae-Hwan KIM (POSTECH) | Jan. Switching handedness of of chiral solitons in Z4 topological insulators |
77 | 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 |
76 | Apr. 01 (Fri.) 4:15 PM | E6-2. 1st fl. #1501 | Dr. JONG SOO LIM, KIAS | Cotunneling drag effect in Coulomb-coupled quantum dots |
75 | Apr. 08 (Fri.), 13:30 PM | E6-2. 1st fl. #1501 | Dr. Yunkyu Bang, Chonnam National Univ. | Theoretical Overview of Iron-based superconductors and its future |
74 | 2015/10/16, 4PM | E6-2. 2nd fl. #2501 | Prof. Yung-Fu Chen(Solid-state Laser Physics Laboratory,National Central University) | Fluctuations of entropy production in partially masked electric circuits |
73 | 2015/09/14, 2PM | E6-2. 2nd fl. #2501 | Dr. Hae Ja Lee ( Stanford University, SLAC ) | Ultrafast X-ray Studies on Dynamics Matter in Extreme Conditions |
72 | Jan.9 (Wed.), 04:00 PM | E6-2. 2nd fl. #2501 | Dr. Heung-Sik Kim |
Molecular Mott state in the deficient spinel GaV4S8
![]() |
71 | Jun. 18 (MON), 10:00 AM | E6-2. 2nd fl. #2502 | Dr. Thibault VOGT |
Rydberg electromagnetically induced transparency and microwave-to-optical conversion using Rydberg atoms
![]() |
70 | NOV. 23 (Fri), 03:00 PM | E6-2. 2st fl. #2501 | Prof. Sang-Jin Sin |
Entanglement string and Spin Liquid with Holographic duality
![]() |
69 | JAN. 7 (Mon), 03:00 PM | E6-2. 2st fl. #2501 | Dr. Byoung min Kang |
Many-Body Invariants for Multipoles in Higher-Order Topological Insulators
![]() |
68 | MAR. 26 (TUE), 0300 PM | E6-2. 2st fl. #2501 | Prof. Jung Hoon Han |
Consideration of thermal Hall effect in frustrated and un-frustrated quantum magnets
![]() |
67 | Sep. 4 (Tue), 02:30 PM | E6-2. 2st fl. #2502 | Dr. Changmin Lee, MIT |
Ultrafast time- and angle-resolved photoemission spectroscopy (tr-ARPES) with extreme ultraviolet laser pulses
![]() |
66 | May. 3 (Fri), 11:00 AM | E6-2. 2st fl. #2502 | Prof. Changhee Sohn |
Exotic Magnetism
![]() |
65 | Apr. 08 (Fri.), 4:00 PM | E6-2. 5st fl. #1501 | Dr. Changyoung Kim, SEOUL NATIONAL UNIV. | Spectroscopic studies of iron-based superconductors : what have we learned? |
64 | February 13th (Thur.), 16:30 PM | E6-6, #119 | Dr. Seyoon Kim(University of Wisconsin-Madison) |
Enhanced Light-Matter Interactions in Graphene with Noble Metal Plasmonic Structures
![]() |
63 | 2018. 6. 22 10:00am ~ 11:50am | E6-6, Lecture Room 119 (1F) | Prof. Sang Bok Lee, Dept. of Chemistry and Biochemistry, Univ. of Maryland |
Success in Research Career
![]() |
62 | May 13 (Fri.) 4 PM | E6. #1501(1st fl.) | Dr. Hosub Jin, Dept. of Physics, UNIST | Graphene analogue in (111)- BaBiO3 bilayer heterostructures for topological electronics |
61 | May 13 (Fri.), 1:30 PM | E6. #1501(1st fl.) | Dr. Young-Woo Son, Dept. of Physics, KIAS | Aperiodic crystals in low dimensions |