The range of non-Kitaev terms and fractional particles in α-RuCl3

被引：49

作者：

Wang, Yiping ^{[1
]}

Osterhoudt, Gavin B. ^{[1
]}

Tian, Yao ^{[2
]}

Lampen-Kelley, Paige ^{[3
]}

Banerjee, Arnab ^{[4
,5
]}

Goldstein, Thomas ^{[6
]}

Yan, Jun ^{[6
]}

Knolle, Johannes ^{[7
]}

Ji, Huiwen ^{[8
]}

Cava, Robert J. ^{[8
]}

Nasu, Joji ^{[9
]}

Motome, Yukitoshi ^{[10
]}

Nagler, Stephen E. ^{[4
]}

Mandrus, David ^{[3
]}

Burch, Kenneth S. ^{[1
]}

机构：

[1] Boston Coll, Dept Phys, 140 Commonwealth Ave, Chestnut Hill, MA 02467 USA

[2] SICK Prod Ctr Asia Pte Ltd, 8 Admiralty St, Singapore 757438, Singapore

[3] Univ Tennessee, Dept Mat Sci & Engn, Knoxville, TN 37821 USA

[4] Oak Ridge Natl Lab, Neutron Scattering Div, Oak Ridge, TN 37831 USA

[5] Purdue Univ, Dept Phys & Astron, W Lafayette, IN 47906 USA

[6] Univ Massachusetts, Dept Phys, Amherst, MA 01003 USA

[7] Imperial Coll London, Blackett Lab, London SW7 2AZ, England

[8] Princeton Univ, Dept Chem, Princeton, NJ 08540 USA

[9] Yokohama Natl Univ, Dept Phys, Yokohama, Kanagawa 2408501, Japan

[10] Univ Tokyo, Dept Appl Phys, Bunkyo Ku, Tokyo 1138656, Japan

来源：

NPJ QUANTUM MATERIALS | 2020年 / 5卷 / 01期

基金：

美国国家科学基金会;

关键词：

LIGHT-SCATTERING; SPIN; LIQUID; FLUCTUATIONS; STATE;

D O I：

10.1038/s41535-020-0216-6

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Significant efforts have focused on the magnetic excitations of relativistic Mott insulators, predicted to realize the Kitaev quantum spin liquid (QSL). This exactly solvable model involves a highly entangled state resulting from bond-dependent Ising interactions that produce excitations which are non-local in terms of spin flips. A key challenge in real materials is identifying the relative size of the non-Kitaev terms and their role in the emergence or suppression of fractional excitations. Here, we identify the energy and temperature boundaries of non-Kitaev interactions by direct comparison of the Raman susceptibility of alpha-RuCl3 with quantum Monte Carlo (QMC) results for the Kitaev QSL. Moreover, we further confirm the fractional nature of the magnetic excitations, which is given by creating a pair of fermionic quasiparticles. Interestingly, this fermionic response remains valid in the non-Kitaev range. Our results and focus on the use of the Raman susceptibility provide a stringent new test for future theoretical and experimental studies of QSLs.

引用

页数：8

共 72 条

[1] Cu2IrO3: A New Magnetically Frustrated Honeycomb Iridate [J].

Abramchuk, Mykola ;

Ozsoy-Keskinbora, Cigdem ;

Krizan, Jason W. ;

Metz, Kenneth R. ;

Bell, David C. ;

Tafti, Fazel .

JOURNAL OF THE AMERICAN CHEMICAL SOCIETY, 2017, 139 (43) :15371-15376

[2]

Banerjee A, 2016, NAT MATER, V15, P733, DOI [10.1038/nmat4604, 10.1038/NMAT4604]

[3] Neutron scattering in the proximate quantum spin liquid α-RuCl3 [J].

Banerjee, Arnab ;

Yan, Jiaqiang ;

Knolle, Johannes ;

Bridges, Craig A. ;

Stone, Matthew B. ;

Lumsden, Mark D. ;

Mandrus, David G. ;

Tennant, David A. ;

Moessner, Roderich ;

Nagler, Stephen E. .

SCIENCE, 2017, 356 (6342) :1055-1058

[4] Spin-orbit physics of j=1/2 Mott insulators on the triangular lattice [J].

Becker, Michael ;

Hermanns, Maria ;

Bauer, Bela ;

Garst, Markus ;

Trebst, Simon .

PHYSICAL REVIEW B, 2015, 91 (15)

[5] Magnetism in two-dimensional van der Waals materials [J].

Burch, Kenneth S. ;

Mandrus, David ;

Park, Je-Geun .

NATURE, 2018, 563 (7729) :47-52

[6] FLUCTUATION-DISSIPATION THEOREMS FOR DRIVEN NON-LINEAR MEDIA AT OPTICAL FREQUENCIES [J].

BUTCHER, PN ;

OGG, NR .

PROCEEDINGS OF THE PHYSICAL SOCIETY OF LONDON, 1965, 86 (552P) :699-&

[7] Low-temperature crystal and magnetic structure of α-RuCl3 [J].

Cao, H. B. ;

Banerjee, A. ;

Yan, J. -Q. ;

Bridges, C. A. ;

Lumsden, M. D. ;

Mandrus, D. G. ;

Tennant, D. A. ;

Chakoumakos, B. C. ;

Nagler, S. E. .

PHYSICAL REVIEW B, 2016, 93 (13)

[8] Path to stable quantum spin liquids in spin-orbit coupled correlated materials [J].

Catuneanu, Andrei ;

Yamaji, Youhei ;

Wachtel, Gideon ;

Kim, Yong Baek ;

Kee, Hae-Young .

NPJ QUANTUM MATERIALS, 2018, 3

[9] Kitaev-Heisenberg Model on a Honeycomb Lattice: Possible Exotic Phases in Iridium Oxides A2IrO3 [J].

Chaloupka, Jiri ;

Jackeli, George ;

Khaliullin, Giniyat .

PHYSICAL REVIEW LETTERS, 2010, 105 (02)

[10] Na2IrO3 as a Novel Relativistic Mott Insulator with a 340-meV Gap [J].

Comin, R. ;

Levy, G. ;

Ludbrook, B. ;

Zhu, Z. -H. ;

Veenstra, C. N. ;

Rosen, J. A. ;

Singh, Yogesh ;

Gegenwart, P. ;

Stricker, D. ;

Hancock, J. N. ;

van der Marel, D. ;

Elfimov, I. S. ;

Damascelli, A. .

PHYSICAL REVIEW LETTERS, 2012, 109 (26)

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