korean english


Home > 게시판 > 세미나

일시: 7월 15일(금) 오전 11:00

장소: 기초학문관 창의존 (51305)

○ 연사: 백  승  호 박사님 (IFW Dresden)

Title: Observation of a field induced quantum spin liquid in α-RuCl3

○ Abstract: 

Topological states of matter such as quantum spin liquids (QSLs) are of great interest because of their remarkable predicted properties including protection of quantum information and the emergence of Majorana fermions. Such QSLs, however, have proven very difficult to identify experimentally. A major search has centered so far on iridate materials which are proposed to realize the celebrated Kitaev model [1] on a honeycomb lattice — a prototypical topological QSL system in two dimensions (2D). However, at low temperatures long-range magnetic order develops in these iridates due to the presence of significant residual Heisenberg-type of interactions between the spins, which preempt the QSL regime. Recently, studies have shown that the magnetic interactions in a ruthenium-based material, α-RuCl3, are closer to the Kitaev limit, but also this quasi-2D magnetic material exhibits magnetic order at low temperatures [2, 3, 4]. In this talk I will show that an external magnetic field melts the long-range magnetic order in α-RuCl3. Nuclear Magnetic Resonance (NMR) measurements of the spin-relaxation rate evidence that in field larger than ∼ 10 T a spin-gap opens and scales linearly with the magnetic field, whereas at the same time the resonance lines remain very sharp [5]. This indicates that in the spin-gap phase the spins are quantum disordered and locally fluctuating. Our observation of a field- induced QSL in α-RuCl3 within an essentially established theoretical framework holds promise for the future detection, manipulation and eventually braiding of these non-Abelian quasiparticles.

[1] A. Kitaev, Annals of Physics, 321, 2 (2006)
[2] K. W. Plumb et al, PRB 90, 041112 (2014)
[3] L. J. Sandilands, PRL 114, 147201 (2015)
[4] A. Banerjee et al, Nature Materials 15, 733 (2016)
[5] S.-H. Baek et al, (Unpublished, under review).

번호 제목 날짜 조회 수
공지 <12/8(Thu.) 11:00am>노벨상 소개 강연 - 2016년 노벨 물리학상: 위상 응집 물리의 탄생 2016.11.28 1088826
556 <Jan.28(Thu.)>X-ray Absorption Spectroscopy Study of Amorphous Oxide Thin Films 2021.01.27 113211
555 <6/2>백색 LED를 이용한 반도체조명에 관하여 2006.05.29 112542
554 <6/8> 액체금속 및 물의 과냉각 현상과 국소구조와의 관계 : 정전기 공중부양 기술 및 dynamic diamond anvil cell 2011.06.07 112187
553 <9/26(Thu.) 4:30 pm ~ > Neutrino Physics and Dark Matter search in IBS 2019.09.24 111762
552 <11/29> Kahler Inflation and WMAP7 data - a top down approach to Cosmology 2010.11.25 111739
551 <1/24> Basics of Gravitational Perturbatiosn 2011.01.19 111430
550 <4/5(Wed.) 11:00am>Adhesion forces between nanoparticles in gas-phase processes and application 2017.04.03 111246
549 2018학년도 1학기 콜로퀴움 일정 2018.01.03 111044
548 <4/27> RENO Reactor Neutrino Experiment 2011.04.18 110943
547 <10/15> An Ideal Mean-Field Transition in a Driven Interacting System 2009.09.30 109772
546 <11/21> Cosmological viable scalar-tensor theories of gravity 2012.11.16 109765
545 <1/8>Supersymmetric states in AdS/CFT 2009.01.05 109731
544 <7/17> Atomic-scale polar oxide heterostructures: Growth and interfacial properties 2009.07.13 109696
543 <4/15(수) 오후4:30분> Who is SHE? 2015.04.08 109423
542 2017학년도 2학기 콜로퀴움 일정 2017.07.04 108996
541 <5/18> Baryons in AdS/QCD 2007.05.15 108217
540 <4/9> Quantum oscillations at the LHC 2014.04.03 107844
539 <Dec. 2(Wed.) 4:30 PM> Next-generation solar cells for high photo-conversion efficiency 2015.11.25 107757
538 <6/5> Bilinear Wess-Zumino term for open AdS superstring: covariant description of D-branes 2012.06.04 107703
537 <11/28> Extremal Black Holes and Holographic C-theorem 2012.11.28 107577