날짜 | 2015-12-11 13:30 |
---|---|
일시 | 2015/12/11, 1:30PM |
장소 | E6-2, #1323 |
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 | 날짜 | 장소 | 제목 |
---|---|---|---|
544 | 2021-02-15 17:00 | Zoom | Magnetic Cluster Octupole Domain evolutation in chiral antiferromagnets |
543 | 2020-12-09 10:00 | Zoom | Searching for the QCD axion with the ARIADNE experiment |
542 | 2017-04-27 16:00 | Seminar Room(#1323, E6-2) | 반도체 양자점을 이용한 단광자 광원 |
541 | 2017-03-06 16:00 | Seminar Room 1501 | Spring 2017: Physics Colloquium |
540 | 2019-09-02 16:00 | Seminar Room 1501 | Fall 2019: Physics Colloquium |
539 | 2017-03-21 16:00 | Seminar Room 1323 | Spring 2017: Physics Seminar Serises |
538 | 2018-07-02 15:00 | Seminar Room (C303), Creation Hall (3F), KAIST Munji Campus | High Precision Magnetic Field Measurement for the Muon g-2 Experiment |
537 | 2017-12-14 15:00 | Seminar Room (C303), Creation Hall (3F), KAIST Munji Campus | Exploring the Universe via GWs in the era of multi-messenger astronomy |
536 | 2016-06-14 16:00 | Seminar Room (#2502, 2nd fl.) | Photonic quantum network based on multimode squeezed vacuums and single-photon subtraction |
535 | 2016-11-01 14:30 | Seminar Room #1323(E6-2) | Search for dark sector particles in the B-factory experiments |
534 | 2019-09-18 16:00 | Seminar Room #1323 | Fall 2019: Physics Seminar Serises |
533 | 2018-07-27 15:00 | Room 5318, KAIST Natural Sciences Lecture Hall(E6). | Muon g-2 in the 2HDM and MSSM: comprehensive numerical analysis and absolute maxima |
532 | 2018-07-27 15:00 | Room 5318, KAIST Natural Sciences Lecture Hall(E6). | Muon g-2 in the 2HDM and MSSM: comprehensive numerical analysis and absolute maxima |
531 | 2018-07-26 14:00 | Room 5318, KAIST Natural Sciences Lecture Hall(E6). | Inflation in String Theory and Backreaction |
530 | 2018-07-26 14:00 | Room 5318, KAIST Natural Sciences Lecture Hall(E6). | Inflation in String Theory and Backreaction |
529 | 2018-07-13 14:00 | Room 5318, KAIST Natural Sciences Lecture Hall(E6). | Loop Induced Single Top Partner Production and Decay at the LHC |
528 | 2018-07-12 17:00 | Room 5318, KAIST Natural Sciences Lecture Hall(E6) | The MilliQan Experiment: Search for Milli-Charged Particles at the LHC |
527 | 2023-04-04 16:00 | Room 2501, KAIST Natural Sciences Lecture Hall(E6) | Chiral Magnetism: A Geometric Perspective |
526 | 2023-02-20 16:00 | Room 1323, KAIST Natural Sciences Lecture Hall(E6) | Physics of ferromagnet/superconductor junctions |
525 | 2015-06-03 12:00 | Room 101, E11 | The First Wednesday Multidisciplinary Forum |