logo

korean english

게시판

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[5] S.-H. Baek et al, (Unpublished, under review).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 2022학년도 1학기 콜로퀴움 일정 2022.01.10 2696
공지 <12/8(Thu.) 11:00am>노벨상 소개 강연 - 2016년 노벨 물리학상: 위상 응집 물리의 탄생 2016.11.28 814334
488 <10/25(Tue.) 11:00am>Crystallization of Water under Modulating Pressures 2016.10.14 50264
487 <Oct. 19(Wed.) 10:00 AM> Hyper-Kamiokande project -The future of neutrino physics in Japan 2016.10.12 53821
486 <10/11(Tue.) 15:00>Analysis of Individual Terrestrial Gamma-ray Flashes 2016.10.10 52936
485 <10/25(Tue.) 11:00am>Crystallization of Water under Modulating Pressures 2016.10.10 49351
484 <10/12(Wed.) 11:00am>Unconventional Superconductivity: From History to Mystery 2016.10.10 67391
483 <Oct. 12(Wed.) 4:30 PM> Silk as a biocompatible optical material 2016.10.05 56151
482 <10/13(Thu.) 13:00>기술융합을 통한 의료혁명과 물리학의 역할 2016.09.29 47207
481 <Oct. 5(Wed.) 4:30 PM> 국제원자력기구 (IAEA)와 핵데이터 2016.09.22 52179
480 <Sep. 21(Wed.) 4:30 PM>광자질량의 물리학 2016.09.19 51736
479 <Sep. 7(Wed.) 4:30 PM>Manipulating spins in topological insulators 2016.09.02 61708
478 <9/22(Thu.) 10:30> Bulk-boundary correspondence from the inter-cellular Zak phase 2016.08.29 52743
477 2016학년도 2학기 콜로퀴움 일정 2016.08.02 89205
476 <8/5(Fri.) 10:30> Phase Slips in Superfluid Spin Transport in Magnetic Wires 2016.08.02 48961
475 <7/18(Mon.) 14:00> GEANT4 Particle Physics Simulation Software: A Brief Overview From a User’s Perspective 2016.07.15 49262
» <7/15(Fri.) 11:00> Observation of a field induced quantum spin liquid in α-RuCl3 2016.07.14 53504
473 <7/15(Fri.) 14:00> Electronic quasiparticles in the quantum dimer model 2016.07.12 54088
472 <7/12(Tue.) 11:00> Spin-direction-dependent magnetoelastic coupling on MnO, CoO, and NiO file 2016.07.01 54581
471 <6/24(Fri.) 1:30pm>Emergent geometry from field theory: Wilson's renormalization group revisited 2016.06.20 52012
470 <June 8(Wed.) 4:30 PM> 세계와 우리나라 우주개발 도전 2016.06.01 49700
469 <June 1(Wed.) 4:30 PM> 중력으로 강한 핵력 이해하기 2016.05.26 49422