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[5] S.-H. Baek et al, (Unpublished, under review).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 <12/8(Thu.) 11:00am>노벨상 소개 강연 - 2016년 노벨 물리학상: 위상 응집 물리의 탄생 2016.11.28 1029983
236 <March.24(Thu) 14:00> A new boson and muon g-2 2016.03.17 62894
235 <3/11(Mon) 10:30 am ~ >Probing Dark Matter at LIGO and Beyond 2019.03.04 62950
234 <10/1(Tue.) Mini-Workshop on BSM Physics with Neutrino Detectors 2019.09.30 63252
233 <10/5> Gauge fields. Past, present, future. 2012.10.05 63429
232 <6/15(Fri.) ~ 16(Sat.)> Formation of first star and galaxy, Gravitational waves from Binary Mergers of Sub-Solar Mass Dark Black Holes 2018.06.12 63741
231 <7/15(Fri.) 14:00> Electronic quasiparticles in the quantum dimer model 2016.07.12 63771
230 <9/11(목)> The effects of dark matter elastic scattering on the cosmological signals 2014.09.01 63831
229 <March 8(Tue) 18:00> Unsolved puzzles of Gamma-Ray Bursts 2016.03.03 63947
228 <2/7> Exotic phases in pyrochlore iridates 2013.02.05 64043
227 <May.27(Fri.) 10:00> Towards Magnetic 2D Materials 2016.04.27 64099
226 <2/9(월) 오전 11시> 특별 초청세미나 개최 안내 file 2015.02.03 64176
225 <Dec.30(Wed) 16:30> Some basics about the thermoelectricity; the semi-classical Boltzmann transport approach 2015.12.24 64379
224 <March.18(Fri) 11:00> High Pressure Synthesis and Characterization of Non-Oxide Superconductors 2016.03.14 64431
223 <10/11(Tue.) 15:00>Analysis of Individual Terrestrial Gamma-ray Flashes 2016.10.10 64550
222 <6/9(화)> 세미나 개최 안내 2015.06.09 64854
221 <4/15(수)> 세미나 개최 안내 2015.04.09 64907
220 <9/22(Thu.) 10:30> Bulk-boundary correspondence from the inter-cellular Zak phase 2016.08.29 65034
219 <3/22> 석학초청 특별강연 – Pyeongyang Advances Its Nuclear Program 2012.03.07 65173
218 <Jan.28(Thu.)>X-ray Absorption Spectroscopy Study of Amorphous Oxide Thin Films 2021.01.27 65346
217 <9/2(Mon) 15:00 ~ >Status of the KM3NeT Deep Sea Neutrino Telescope 2019.08.26 65435