장소 | E6-2, #1323 |
---|---|
일시 | 2015/12/11, 1:30PM |
연사 | Dr. KwangYong Choi (Chung-Ang University) |
Quantum spin liquid in the 1/3 depleted triangular lattice Ba3(Ru1-xIrx)Ti2O9
Dec. 11. (Fri.), 13:30 PM, E6-2. 1st fl. #1323
Dr. KwangYong Choi (Chung-Ang University)
Geometrically frustrated antiferromagnets are a versatile reservoir for emergent quantum-correlated phenomena such as spin liquids, fractionalized excitations, and magnetic monopoles. Recent experiments on the 6H-perovskite family Ba3AB2O9 (A=Cu, Ni, Co, Ru, Ir; B=Sb, Ti) have disclosed a variety of interesting ground states: a random singlet, spin liquid, spin freezing, and 120? ordering, depending on a spin number, spin-orbit coupling, and Jahn-Teller (JT) distortions. In this talk, I will briefly introduce spin liquid in the context of topological order and then present experimental results on the two materials Ba3CuSb2O9 and Ba3Ru1-xIrxTi2O9. In Ba3CuSb2O9, a combined effect of frustration and local JT distortions may create a novel spin-orbital entangled state. Our ESR results provide evidence for intrinsic coupling of spins to orbital degrees of freedom and thereby demonstrate that magnetism is dictated by a spatiotemporal structure of the JT distortions. In Ba3Ru1-xIrxTi2O9, a 1/3 depleted triangular lattice with strong spin-orbit coupling we address the possibility of spin-orbit tuned spin liquids. For the 4d Ru compound, we find experimental signatures of a coexisting spin freezing and dynamically fluctuating state. In the 5d Ir counterpart, spin-orbit coupling melts residual spin freezing while stabilizing a spin liquid state. Our comparative study evidences that spin depletion and spin-orbit coupling conspire to promote a quantum spin liquid in triangular antiferromagnets.
Contact: Heung Sun Sim, Physics Dept., (hs_sim@kaist.ac.kr)
댓글 0
번호 | 일시 | 장소 | 연사 | 제목 |
---|---|---|---|---|
136 | April 23 (Tue.), 4:00 PM | #1323, E6-2 | Prof. Johan Chang |
From Mott physics to high-temperature superconductivity
![]() |
135 | Jul. 28 (Thu.) 4PM | #1323(E6-2. 1st fl.) | Prof. Johannes Pollanen, Jerry Cowen Chair of Experimental Physics at Michigan State University | Low Dimensional Electrons: On the Road to Hybrid Quantum Systems |
134 | 2017.1.9(Mon), 4PM | Lecture Hall, College of Natural Sciences [#1501,E6-2] | Prof. John Michael Kosterlitz, Brown University |
Topological Defects and Phase Transitions"
![]() |
133 | May 9 (Wed.), 04:00 PM | #1323, E6-2 | Prof. Jong-Soo Rhyee |
Recent advances in thermoelectric bulk composites
![]() |
132 | October 18 (Thu.), 16:00 PM | #1323, E6-2 | Prof. Jongseok Lee |
Applications of nonlinear optics for condensed matter researches
![]() |
131 | September 20 (Thu.), 16:00 | #1323, E6-2 | Prof. Joo-Hiuk Son |
Toward Cancer Treatment Using Terahertz Radiation: Demethylation of Cancer DNA
![]() |
130 | April 11 (Thu.), 16:00 PM | #1323, E6-2 | Prof. Joo-Hyoung Lee, GIST |
Massive screening for cathode active materials using deep neural network
![]() |
129 | May 2 (Thu.), 4:00 PM | #1323, E6-2 | Prof. Joon Ik Jang |
Anomalous optical properties of halide perovskites
![]() |
128 | October 29 (Tue.), 14:30 PM | #1323, E6-2 | Prof. Jörg Wrachtrup |
Quantum sensing
![]() |
127 | October 11 (Thu.), 16:00 PM | #1323, E6-2 | Prof. Joung-Real Ahn |
Dirac electrons in a graphene quasicrystal
![]() |
126 | June 3rd, Fri. 9:30 AM | Online seminar | Prof. Juejun Hu ( Massachusetts Institute of Technology) |
(Quantum-&Nano-Photonics Webinar) Seeing glass in a new light: reimagine chalcogenide photonics
![]() |
125 | MAR. 26 (TUE), 0300 PM | E6-2. 2st fl. #2501 | Prof. Jung Hoon Han |
Consideration of thermal Hall effect in frustrated and un-frustrated quantum magnets
![]() |
124 | DEC. 16~18 (Sun~Tue) | E6-2. 1st fl. #1323 | Prof. Keisuke Totsuka |
Lectures on 2d Conformal Field Theory
![]() |
123 | June 14 (THU), 10:00 AM | E6-2, 2nd fl. #2502 | Prof. Kenji Toyoda |
Phonons and polariton-like particles in trapped ions for quantum computation and quantum simulation
![]() |
122 | 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
![]() |
121 | February 12(Web.) | E6-2, #5318 | Prof. Kunio Kaneta |
From inflation to new weak-scale
![]() |
120 | May 9 (Thu.), 16:00 PM | #1323, E6-2 | Prof. Kwang Geol Lee |
Quantum Optical Sensing Using Single Photons And Single Photon Emission from Single Emitters
![]() |
119 | May 9 (Thu.), 16:00 PM | #1323, E6-2 | Prof. Kwang Geol Lee |
Quantum Optical Sensing Using Single Photons And Single Photon Emission from Single Emitters
![]() |
118 | May 20(Fri.) 11:00 | E6-1 #1323 | Prof. Kwanpyo Kim (Department of Physics, Yonsei University) | (응집물리 세미나) Exploration of new polymorphs in van der Waals crystals |
117 | November 28 (Thu.), 16:00 PM | #1323, E6-2 | Prof. Kyung Taec Kim |
Generation of coherent EUV emissions using ultrashort laser pulses
![]() |