visual
visual

세미나

  • HOME
  • >
  • 소식
  • >
  • 세미나
날짜 2017-11-03 16:00 
일시 Nov. 3 (Fri.), 4:00 PM 
장소 #1323 (1st fl., E6-2.) 
연사 Dr. SungDae Ji (Max Planck POSTECH/Hshinchu Center (MPK)) 

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 장소 제목
573 2009-02-23 16:00  E6, 1501  Physics Colloquium : 2009 Spring file
572 2009-09-07 16:00  E6, 1501  Physics Colloquium : 2009 Fall file
571 2009-10-21 16:00  E6, 1501  Interdimensional Universality of Dynamic Interfaces
570 2010-02-08 16:00  E6, 1501  Physics Ciolloquium : 2010 Spring file
569 2010-02-14 16:00  E6, 1501  Physics Colloquium - 2011 Spring file
568 2010-09-06 16:00  E6, 1501  Physics Colloquium : 2010 Fall file
567 2011-05-16 16:00  E6, 1501  Photonics with surface plasmon polaritons
566 2011-09-03 16:00  E6, 1501  Physics Colloquium : 2011 Fall file
565 2012-02-13 16:00  E6, 1501  Physics Colloquium : 2012 Spring
564 2012-04-02 16:00  E6, 1501  A new route to ferroelectricity in magnetic spinels: a case of Co2MnO4
563 2013-03-11 16:00  E6, 1501  Physics Colloquium : 2013 Spring
562 2013-09-09 16:00  E6, 1501  Physics Colloquium : 2013 Fall
561 2014-03-10 16:00  E6, 1501  Physics Colloquium : 2014 Spring file
560 2014-05-28 17:00  KI Building, Matrix Hall  부품소재산업이 미래다
559 2014-12-22 14:00  E6, Rm1319  Dynamics of molecular motors: Power stroke vs Brownian ratchet file
558 2015-03-04 12:00  1323호, E6-2  Bioimaging and Biosensing Using Near-Infrared Fluorescence file
557 2015-03-09 16:00  E6, 1501  Physics Colloquium : 2015 Spring file
556 2015-03-13 14:00  Connect Room, KI Bldg.  The 15th Innovative Workshop on Soft/Bio Materials file
555 2015-06-03 12:00  Room 101, E11  The First Wednesday Multidisciplinary Forum file
554 2015-07-15 14:00  E6-2,1323  Electronic and optical properties of titanate-based oxide superlattices