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 |
40 | October 17 (Thu.), 16:00 PM | #1323, E6-2 | Prof. Namkyoo Park |
Top down manipulation of Waves : From Metamaterials, Correlated Disorder, Quantum Analogy, to Digital Processing
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39 | October 18 (Thu.), 10:00 AM | #1323, E6-2 | Dr. Duyoung Min |
Understanding membrane protein folding using single-molecule force techniques
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38 | October 18 (Thu.), 16:00 PM | #1323, E6-2 | Prof. Jongseok Lee |
Applications of nonlinear optics for condensed matter researches
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37 | October 19 (Fri.), 10:00 AM | #1323, E6-2 | Dr. Jongsoo Yoo |
Energy conversion processes during magnetic reconnection in a laboratory plasma
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36 | October 24 (Wed.), 10:30 AM | E6-1, Lecture Room 1501(1F) | Prof. Kerry J. Vahala |
Photonic integration of next-generation clocks and Hertz-absolute-accuarcy optical frequenncy synthesizers
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35 | October 25 (Thu.), 4:00 PM | #1323, E6-2 | Dr. Gang Li |
Abelian and non-Abelian dark photons
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34 | 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
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33 | October 29 (Tue.), 10:00am | #1323 (E6-2, 1st fl.) | Prof. Se Kwon Kim |
Unconventional Spin Transport in Quantum Materials
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32 | October 29 (Tue.), 14:30 PM | #1323, E6-2 | Prof. Jörg Wrachtrup |
Quantum sensing
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31 | October 29 (Tue.), 4:00pm | #1323 (E6-2, 1st fl.) | Dr. Seung-Joo Lee |
Particles and Gravity via String Geometry
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30 | October 31 (Thu.), 10:00am | #1323 (E6-2, 1st fl.) | Dr. Seung-Sup Lee |
Kondo meets Hubbard: Impurity physics for correlated lattices
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29 | October 4 (Thu.), 16:00 PM | #1323, E6-2 | Prof. Soo Jin Kim |
Engineering light absorption in an ultrathin semiconductor metafilm
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28 | Sep. 02(Fri) 2:30 PM | E6-2(1st fl.), #1323 | Dr. Yong-Hyun Kim,Graduate School of Nanoscience and Technology, KAIST | Nanoscale Thermal Physics: Seebeck Effect and Nanoscale Friction |
27 | Sep. 02(Fri) 4:00 PM | E6-2(1st fl) #1323 | Dr. Yong-Joo Doh, Department of Physics and Photon Science, GIST | Quantum Electrical Transport in Topological Insulator Nanowires |
26 | Sep. 10 (Tue.), 03:00 PM | E6-2. 1st fl. #1323 | Dr. Mikhail Kiselev |
Two-Stage Kondo Effect
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25 | Sep. 11(Fri), 14:00~ | zoom | 이관형교수/SNU, 이상윤교수/GIST |
SRC Seminar
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24 | Sep. 12 (Tue.), 4 PM | #1323 (E6-2. 1st fl.) | Prof. Yi. Zhou (The Zhejiang Univ.) |
Exact Solution for the Interacting Kitaev Chain at Symmetric Point
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23 | Sep. 13 (Wed.), 4 PM | #1323 (E6-2. 1st fl.) | Prof. Yi. Zhou (The Zhejiang Univ.) |
An Introduction to Quantum Spin Liquids
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22 | Sep. 14(Mon) 17:30~ | Zoom webinar | Teruo Ono (Kyoto U. Japan) |
KAIST Global Forum for Spin and Beyond (Third Forum)
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21 | Sep. 22 (Fri.), 01:00 PM | E6-2. 1st fl. #1323 | Dr. EunSeong Kim / Department of Physics, KAIST |
Superconductor-metal-insulator transition in thin Tantalum films
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