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장소 #1323 (1st fl., E6-2.) 
일시 Nov. 3 (Fri.), 4:00 PM 
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 일시 장소 연사 제목
공지 2019/09/18 - 12/5  Seminar Room #1323  Prof. David Schuster and etc.  Fall 2019: Physics Seminar Serises
공지 2019/09/02 - 12/09  Seminar Room 1501  이호성 박사 (한국표준과학연구원) and etc.  Fall 2019: Physics Colloquium
279 November 21 (Wed.), 15:00 PM  #1323, E6-2  Prof. Seongshik Oh  Engineering topological quantum physics at the atomic scale file
278 May 9 (Wed.), 04:00 PM  #1323, E6-2  Prof. Jong-Soo Rhyee  Recent advances in thermoelectric bulk composites file
277 October 18 (Thu.), 16:00 PM  #1323, E6-2  Prof. Jongseok Lee  Applications of nonlinear optics for condensed matter researches file
276 October 15 (Mon.), 16:00 PM  #1323, E6-2  Dr. Yongjoo Baek  Universal properties of macroscopic current-carrying systems file
275 November 14 (Thu.), 16:00 PM  #1323, E6-2  Prof. Ji-Hun Kang  Semi-classical model of polariton propagation file
274 October 26 (Fri.), 4:00 PM  #1323, E6-2  Dr. Kyusung Hwang  Coexisting triple-point and nodal-line topological magnons and thermal Hall effect in pyrochlore iridates file
273 October 11 (Thu.), 16:00 PM  #1323, E6-2  Prof. Joung-Real Ahn  Dirac electrons in a graphene quasicrystal file
272 December 18 (Tue.), 4:00 PM  #1323, E6-2  Prof. Shin-ichi Uchida  Road to Higher Tc Superconductivity file
271 October 25 (Thu.), 4:00 PM  #1323, E6-2  Dr. Gang Li  Abelian and non-Abelian dark photons file
270 November 7 (Thu.), 16:00 PM  #1323, E6-2  Prof. Je-Hyung Kim  Integrated quantum photonics with solid-state quantum emitters file
269 September 20 (Thu.), 16:00  #1323, E6-2  Prof. Joo-Hiuk Son  Toward Cancer Treatment Using Terahertz Radiation: Demethylation of Cancer DNA file
268 December 3 (Tue.), 4:00 PM  #1323, E6-2  Dr. Jong Mok Ok  Toward Quantum Materials with Correlated Oxides file
267 June 22 (Fri.), 04:00 PM  #1323, E6-2  Dr. Daniel Sando  Tuning functional properties of BiFeO3 films using strain and growth chemistry file
266 June 22 (Fri.), 04:00 PM  #1323, E6-2  Dr. Daniel Sando  Tuning functional properties of BiFeO3 films using strain and growth chemistry file
265 June 27 (Wed.), 13:30 PM  #1323, E6-2  Dr. Jung Sik Park  Magnetic reversal of artificial spin ice file
264 May 29 (Tue.), 04:00 PM  #1323, E6-2  Prof. Jae-Won Jang  Investigation on metal nanostructure/semiconductor junction and its applications file
263 November 29 (Thu.), 16:00 PM  #1323, E6-2  Dr. Kee suk Hong  양자 칸델라 실현을 위한 단일 광자 발생장치 개발 file
262 November 8 (Thu.), 16:00 PM  #1323, E6-2  이종완 박사  Conformality lost file
261 September 5 (Wed.), 16:00 PM  #1323, E6-2  Dr. Dirk Wulferding  Shining a light on fractional excitations file
260 February 20 (Thu), 4:00 PM  #1323, E6-2  Seunghyun Khim  Unconventional superconductivity in the locally non-centrosymmetric heavy-fermion CeRh2As2 file