장소 | #1323 (1st fl., E6-2.) |
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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.
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번호 | 일시 | 장소 | 연사 | 제목 |
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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 |
270 | Oct 9 (Fri), 09:00 AM | https://kaist.zoom.us/j/85161896513?pwd=U3pwWFFZaWVRamxDZUR5REhNeVk0UT09 | Prof. Tim Hsieh (Perimeter Institute) |
Quantum Many-Body Simulation
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269 | Oct 23 (Fri.), 14:00 PM | E6-2 #1323 | Prof. Ivan Savenko (University of Science and Technology & IBS PCS) |
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268 | November 8 (Thu.), 16:00 PM | #1323, E6-2 | 이종완 박사 |
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267 | November 7 (Thu.), 16:00 PM | #1323, E6-2 | Prof. Je-Hyung Kim |
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266 | November 5 (Tue.), 4:00 PM | #1323, E6-2 | Dr. Shik Shin |
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265 | November 29 (Thu.), 16:00 PM | #1323, E6-2 | Dr. Kee suk Hong |
양자 칸델라 실현을 위한 단일 광자 발생장치 개발
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264 | November 28 (Thu.), 16:00 PM | #1323, E6-2 | Prof. Kyung Taec Kim |
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263 | November 21 (Wed.), 15:00 PM | #1323, E6-2 | Prof. Seongshik Oh |
Engineering topological quantum physics at the atomic scale
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262 | November 20 (Wed.), 4:00 PM | #5302, E6-2 | Dr. Shigeyuki Ishida |
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261 | November 14 (Thu.), 16:00 PM | #1323, E6-2 | Prof. Ji-Hun Kang |
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260 | November 1 (Thu.), 16:00 PM | #1323, E6-2 | Dr. KyeoReh Lee |
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259 | Nov.26(Thu), 04:00PM | Online(Zoom) | Myung-Ki Kim | 2020 가을학기 광학분야 특별세미나(Light Engineering Beyond the Diffraction Limit) |
258 | Nov. 9 (Fri.), 04:00 PM | E6-2. 1st fl. #1323 | Dr. Donghun Lee |
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257 | Nov. 9 (Fri.), 02:30 PM | E6-2. 1st fl. #1323 | Dr. Pilkyung Moon |
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256 | Nov. 8 (Wed.), 1:00 PM | #5318 (E6-2. 5th fl.) | Prof. Y. Matsuda Department of Physics, Kyoto University |
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» | Nov. 3 (Fri.), 4:00 PM | #1323 (1st fl., E6-2.) | Dr. SungDae Ji (Max Planck POSTECH/Hshinchu Center (MPK)) |
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254 | Nov. 3 (Fri.), 2:30 PM | #1323 (1st fl., E6-2.) | Dr. MinChul Lee(Department of Applied Physics, Kyung Hee Univ.) |
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252 | Nov. 28 (Tue.), 4:00 PM | #1323 (E6-2. 1st fl.) | Samindranath Mitra, Editor at Physical Review Letters |
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251 | Nov. 24(Thu) 4p.m. | #1323(E6-2. 1st fl.) | Dr. Jai-Min Choi, Chonbuk National Univiersity | Harmonic oscillator physics with single atoms in a state-selective optical potential |