visual
visual

세미나

  • HOME
  • >
  • 소식
  • >
  • 세미나
날짜 2016-11-16 16:00 
일시 Nov. 16 (Wed), 4p.m. 
장소 #1323(E6-2. 1st fl.) 
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)

 

번호 날짜 장소 제목
527 2010-02-14 16:00  E6, 1501  Physics Colloquium - 2011 Spring file
526 2023-04-14 12:00  E6-2 #1323  (응집물리 세미나)Exotic quantum phenomena in two-dimensional materials file
525 2023-05-12 11:00  E6-2 #1323  (응집물리 세미나)Interlayer conductivity and plasmon in weakly coupled layered systems
524 2022-05-26 16:00  E6 1323  (광학분야 특별세미나)Topological photonic devices
523 2023-06-01 16:00  E6-2 #1323  (광학분야 세미나)Quantum sensing using a squeezed light from hot Rb vapor
522 2015-03-09 16:00  E6, 1501  Physics Colloquium : 2015 Spring file
521 2022-03-31 16:00  online  (광학분야 특별세미나)Ultrafast time-resolved spectroscopy in topological materials
520 2023-03-30 16:00  E6-2 #1323  (광학분야 세미나)Scalable quantum entanglement in trapped-ions based quantum computer
519 2022-08-17 11:00  E6-6 #118호  Robust Hamiltonian Engineering of Large Quantum Systems (큰 양자시스템의 견고한 해밀토니안 엔지니어링)
518 2010-02-08 16:00  E6, 1501  Physics Ciolloquium : 2010 Spring file
517 2009-10-21 16:00  E6, 1501  Interdimensional Universality of Dynamic Interfaces
516 2010-09-06 16:00  E6, 1501  Physics Colloquium : 2010 Fall file
515 2017-03-21 16:00  Seminar Room 1323  Spring 2017: Physics Seminar Serises file
514 2022-05-16 16:00  E6, #1501  Design synthetic topological matter with atoms and lights
513 2020-10-15 16:00  (https://kaist.zoom.us/j/93997220310)  Towards resource-efficient and fault-tolerant quantum computation with nonclassical light
512 2022-04-25 16:00  E6, #1501  Ultrafast electron beam, a tool to explore the nanoscopic world of materials(우리말강의)
511 2017-12-13 13:30  자연과학동 대형강의실 (1501호)  KAIST-KIAS Joint Workshop in Theoretical Sciences 개최 file
510 2019-05-21 16:00  #5318, E6-2  Classification of flat bands according to the band-crossing singularity of Bloch wave functions file
509 2019-09-02 16:00  Seminar Room 1501  Fall 2019: Physics Colloquium file
508 2023-05-26 11:00  E6-2 #1323  (응집물리 세미나)Spectral Analyses of Stochastic Charge Trapping in Oxide Heterostructures file