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)
566 2020-10-16 14:30    Nanoscale magnetic resonance detection towards nano MRI file
565 2015-12-02 16:00    Samarium Hexaboride: Is it a Topological insulator?
564 2020-10-16 16:00    Hidden room-temperature ferroelectricity in CaTiO3 revealed by a metastable octahedral rotation pattern file
563 2015-11-19 16:00    Emergent Collective Phenomena and Functions at Reduced Dimensions
562 2016-05-16 16:00    Tuning microwave cavities with biased nonlinear dielectrics for axion searches
561 2018-10-12 14:30    Quantum Advantage in Learning Parity with Noise file
560 2023-04-04 16:00    Chiral Magnetism: A Geometric Perspective
559 2018-06-22 16:00    Tuning functional properties of BiFeO3 films using strain and growth chemistry file
558 2018-06-22 16:00    Tuning functional properties of BiFeO3 films using strain and growth chemistry file
557 2018-09-05 16:00    Shining a light on fractional excitations file
556 2022-03-18 11:00    (응집물리 세미나) Illuminating exotic states of matter: Raman spectroscopy as an experimental tool to characterize quantum spin liquids file
555 2021-03-02 16:00    Sensitive terahertz detection with graphene-based transistors file
554 2020-11-20 16:00    Coherent control of field gradient induced quantum dot spin qubits
553 2016-11-04 15:00    Quantum information experiments using few electron spins in semiconductors
552 2022-01-17 14:00    Five Lectures on Observational Probes of Dark Energy file
551 2018-11-09 16:00    Quantum sensing and imaging with diamond defect centers for nano-scale spin physics file
550 2022-11-18 16:00    Qubits, new experimental tools for physics file
549 2020-11-20 14:30    Lumpy Cooper pairs in an iron-based superconductor
548 2017-07-10 16:00    “Intertwined Orders in a Heavy-fermion metal” file
547 2022-05-25 14:00    Atomic-level insights into ferroelectric switching and preferred orientation of ultrathin hafnia file