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 |
---|---|---|---|---|
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 |
200 | Oct. 07 (Fri), 4:00 PM | E6-2. #1323(1st fl.) | Dr. Choong Hyun Kim,IBS-CCES, Seoul National University | “Tilt engineering of 4d and 5d transition metal oxides?” |
199 | Nov. 04 (Fri), 1:30 PM | E6-2. #1323(1st fl.) | Dr. Jonghyun Song, Department of Physics, Chungnam National University | Exotic phenomena at oxide LaAlO3/SrTiO3 hetero-interface and their applications |
198 | Nov. 04 (Fri), 3:00 PM | E6-2. #1323(1st fl.) | Dr. Dohun Kim, Department of Physics and Astronomy, SNU | Quantum information experiments using few electron spins in semiconductors |
197 | Nov. 10th(Thu) 4 p.m. | E6-2. #1323(1st fl.) | Prof. Min Seok Jang, Electrical Engineering, KAIST | Low Dimensional Active Plasmonics and Electron Optics in Graphene |
196 | 2015/07/15, 2PM | E6-2,1323 | Dr. Se Young Park(Rutgers Univ.) | Electronic and optical properties of titanate-based oxide superlattices |
195 | December 27(Fri.), 15:00 | E6-2,#5318 | Han Gyeol Suh |
The superconducting order parameter puzzle of Sr2RuO4
![]() |
194 | July 21 - August 2 | E6-2,# 5318 | Junmou Chen/Thomas Flacke/Kaoru Hagiwara/Junichi Kanzaki/Chris Kelso/Jeong Han Kim/Kyoungchul Kong/Gabriel Lee/Hye-Sung Lee/Ian Lewis |
Challenges and Opportunities in Theoretical Particle Physics 2019
![]() |
193 | April 6, 2016 (Wed), 3:30 PM | E6-2, RM #1323 | Dr. Andrei Matlashov (Los Alamos National Laboratory) | Superconducting Quantum Interference Devices for Precision Detection |
192 | Dec. 15 (Fri.), 9:20 AM | E6-2, Lecture Room #1323 | Prof. Jhinhwan Lee 외 9명 |
Workshop on Magnetism in Unconventional Superconductors 개최
![]() |
191 | 2015/10/15, 10AM | E6-2, 5th fl. #5318 | Dr. Mark D. Bird (Florida State University) | Development of Large-Bore, High Field Magnets at the NHMFL |
190 | 2015/10/16, 3PM | E6-2, 5th fl. #5318 | Dr. Pierre Pugnat , (CNRS-LNCMI) | High Magnetic Fields to Probe the sub-eV range of Particle/Astroparticle Physics - From the OSQAR experiments at CERN up to new perspectives at LNCMI-Grenoble |
189 | 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
![]() |
188 | Jul 3rd, 2019 (Wed) | E6-2, 2501 | Kyung Soo Choi |
Many-body quantum electrodynamis (QED) with atoms and photons: A new platform for quantum optics"
![]() |
187 | 2016/03/11-06/09 | E6-2, 1501 외 | 박권(KAIS) 외 |
Physics Seminar Serises : 2016 Spring
![]() |
186 | 2015/07/16-07/17 | E6-2, 1501 | Sang-Wook Cheong (Rutgers Univ.) | KAIST Physics Distinguished Lecture |
185 | 2015/07/16, 4PM | E6-2, 1318 | Dr. Kyunghan Hong(MIT) | Next-generation ultrafast laser technology for nonlinear optics and strong-field physics |
184 | 2015/10/23, 3PM | E6-2, #5318 | Dr. Helmut Soltner (Forschungszentrum Juelich) | Development of a Rogowski Coil as a new beam position monitor |
183 | 2015/11/06, 4:30 PM | E6-2, #5318 | Dr. Youngkuk Kim (University of Pennsylvania) | Topological Dirac line nodes in centrosymmetric semimetals |
182 | February 12(Web.) | E6-2, #5318 | Prof. Kunio Kaneta |
From inflation to new weak-scale
![]() |
181 | 2015/08/03,10:30AM | E6-2, #1323 (Seminar Room) | Dr. Jonghee Yoo (Fermi National Accelerator Laboratory, USA ) | Axion Search |