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)
266 2017-09-26 11:00    Time-resolved ARPES study of Dirac and topological materials
265 2019-11-01 14:30    Squeezing the best out of 2D materials file
264 2019-04-19 14:30    A family of finite-temperature electronic phase transitions in graphene multilayers file
263 2015-11-06 16:30    Topological Dirac line nodes in centrosymmetric semimetals
262 2018-03-16 16:00    Van der Waals Heterostructures from Quantum Transport to Ultrafast Optoelectronics file
261 2018-03-16 16:00    Van der Waals Heterostructures from Quantum Transport to Ultrafast Optoelectronics file
260 2022-08-09 14:00    Quantum biology in fluorescent protein: a new model system to study quantum effects in biology file
259 2016-05-13 13:30    Aperiodic crystals in low dimensions
258 2018-04-11 16:00    Non-Gaussian states of multimode light generated via hybrid quantum information processing file
257 2025-07-03 14:00  Dr. Young-Gwan Choi (Max Planck Institute )  Quantum sensing with NV centers: nanoscale magnetometry file
256 2017-05-12 13:30    Topological Dirac insulator
255 2022-05-13 16:00    High-fidelity iToffoli gate for fixed-frequency superconducting qubits file
254 2022-06-10 11:00    Record-quality two-dimensional electron systems file
253 2018-04-11 13:30    Probing 3D Structure and Physical Properties of Materials at the Single-Atom Level file
252 2018-10-15 16:00    Universal properties of macroscopic current-carrying systems file
251 2016-09-02 16:00    Quantum Electrical Transport in Topological Insulator Nanowires
250 2016-09-02 14:30    Nanoscale Thermal Physics: Seebeck Effect and Nanoscale Friction
249 2023-12-14 16:00    Superconducting qubits for large-scale quantum computers file
248 2023-04-13 11:00    [High Energy Theory Seminar]Noninvertible Gauss Law and Axions
247 2025-04-29 10:00  Dr. Yeonju Go (Brookhaven National Laboratory)  Exploring the Hottest Matter in the Universe: Quark-Gluon Plasma through Hard Probes and Artificial Intelligence file