visual
visual

세미나

  • HOME
  • >
  • 소식
  • >
  • 세미나
날짜 2017-11-03 16:00 
연사  
장소 #1323 (1st fl., E6-2.) 

The seminal work of Anderson triggered a great deal of theoretical and experimental efforts to search for the novel quantum spin liquid (QSL) states in matters, and it has become one of central issues in contemporary condensed matter physics. The QSL state, a long-range quantum entangled state, is represented by a topological order and fractionalization of constituent magnetic moments. While the most QSL states have been described by deconfined spinons as an elementary excitation in frustrated magnets, Kitaev’s QSL state is exactly derived by fractionalizing the spin excitation into Majorana fermions in a two-dimensional honeycomb lattice, the so-called Kitaev lattice, with the ansatz of bond dependent Ising-like spin interaction. In the past decade, experimental realization of the fascinating Kitaev honeycomb QSL model has been eagerly pursued. In this talk, I will present the experimental evidences of fractionalized Majorana fermions in a high quality α-RuCl3 single crystal. Neutron and x-ray diffraction measurements reveal that the low-temperature crystal structure forms the perfect Ru-honeycomb lattice, which provides an ideal platform for the Kitaev honeycomb quantum spin lattice. Extensive thermodynamic and neutron spectroscopic measurements directly proved fractionalized Majorana fermion excitations as a result of thermal fractionalization of Jeff = ½ pseudospins, which is well reproduces by numerical predictions obtained from the Kitaev model.

 

20171103_지성대.pdf

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)
574 2015-11-28 10:00    Electron Tunneling Spectroscopy of Single and Bilayer Graphene with Hexagonal Boron Nitride as Tunneling Barrier
573 2015-12-01 16:00    Introducing extra dimensions to spectroscopic studies of advanced quantum materials
572 2015-12-02 16:00    Samarium Hexaboride: Is it a Topological insulator?
571 2015-12-03 16:00    Hybrid solid state spin qubits in wide bandgap semiconductors
570 2015-12-09 11:00    Functional Imaging & Monitoring of Brain & Breast with Diffuse Light
569 2015-12-09 14:00    SWELLABLE COLLOIDAL PARTICLES ARE SWELL
568 2015-12-11 13:30    Quantum spin liquid in the 1/3 depleted triangular lattice Ba3(Ru1-xIrx)Ti2O9
567 2015-12-11 15:45    Dynamical mean field theory studies on heavy fermion system
566 2015-12-17 11:00    Wavefront engineering for in-vivo Deep brain imaging
565 2016-01-11 16:00    Mott Physics in the Strong Spin-Orbit Coupling Regime
564 2016-01-26 14:00    Electrochemistry on Nano- and Atomic Levels: Scanning Probe Microscopy Meets Deep Data
563 2016-03-07 16:00    Physics Colloquium : 2016 Spring file
562 2016-03-11 13:30    Physics Seminar Serises : 2016 Spring file
561 2016-03-11 13:30    Topological phases of matter in nonequilibrium: Topology of the Wannier-Stark ladder
560 2016-03-11 16:00    Jan. Switching handedness of of chiral solitons in Z4 topological insulators
559 2016-04-01 14:30    Interference of single charged particles without a loop and dynamic nonlocality
558 2016-04-01 16:15    Cotunneling drag effect in Coulomb-coupled quantum dots
557 2016-04-04 09:30    Radio frequency engineering
556 2016-04-05 16:00    A new impurity solver for multi-orbital systems: adaptive truncation of the Hilbert space
555 2016-04-06 15:30    Superconducting Quantum Interference Devices for Precision Detection