visual
visual

세미나

  • HOME
  • >
  • 소식
  • >
  • 세미나
날짜 2016-11-16 16:00 
연사  
장소 #1323(E6-2. 1st fl.) 

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 연사 제목
공지 2025-02-24 16:00    2025년 봄학기 콜로키움 안내
공지 2025-02-27 16:00    2025년 봄 물리학과 특별세미나 (광학/응집물리 분야)
466 2015-12-17 11:00    Wavefront engineering for in-vivo Deep brain imaging
465 2022-12-20 16:00    Studying Baryonic Flow Across the Cosmic Scales Using Radio and Millimeter Wavelength Experiments
464 2016-10-18 15:00    “Hybrid quantum systems with mechanical oscillators”
463 2016-07-08 14:00    Electronic quasiparticles in the quantum dimer model
462 2015-11-24 16:00    Topology-based understanding of spin dynamics in inhomogeneously magnetized systems
461 2022-04-01 16:00    High-field Electron Transport and Interaction Induced Phenomena in 2D Materials file
460 2018-11-29 16:00    양자 칸델라 실현을 위한 단일 광자 발생장치 개발 file
459 2024-03-07 16:00    [CAPP seminars] Development of Superconducting Transition Edge Sensors at SRON file
458 2021-06-11 16:00    Pseudogap in surface-doped black phosphorus file
457 2016-11-11 13:30    Bandgap Engineering of Black Phosphorus
456 2016-04-01 14:30    Interference of single charged particles without a loop and dynamic nonlocality
455 2016-05-31 16:00    Understanding 3D tokamak physics towards advanced control of toroidal plasma
454 2023-07-18 11:00    Non-Hermitian Casimir Effect of Magnons
453 2024-06-13 16:00    Magnonic $\varphi$ Josephson junction and its non-Hermitian Josephson diode effect
452 2023-09-14 16:00    [CAPP seminar] Dark matter searches in Water Cherenkov Detectors file
451 2018-05-11 14:30    Disordered Floquet topological insulators file
450 2016-12-09 16:00    Shift Charge and Spin Photocurrents in Dirac Surface States of Topological Insulator
449 2022-05-13 14:30    Topological Superconducting Spintronics Towards Zero-Power Computing Technologies file
448 2021-07-29 14:00    Gravitationally Induced Dark Sector and Inflationary Dynamics file
447 2015-12-11 13:30    Quantum spin liquid in the 1/3 depleted triangular lattice Ba3(Ru1-xIrx)Ti2O9