Quantum Spin Dynamics Due to Strong Kitaev Interactions in the Triangular-Lattice Antiferromagnet CsCeSe₂

Xie, Tao1,2; Gozel, S.3; Xing, Jie4; Zhao, N.5; Avdoshenko, S. M.6; Wu, L.5,7; Sefat, Athena S.4; Chernyshev, A. L.8; Lauchli, A. M.3,9; Podlesnyak, A.2; Nikitin, S. E.10

2024-08-29

10.1103/PhysRevLett.133.096703

PHYSICAL REVIEW LETTERS   影响因子和分区

0031-9007

1079-7114

The extraordinary properties of the Kitaev model have motivated an intense search for new physics in materials that combine geometrical and bond frustration. In this Letter, we employ inelastic neutron scattering, spin wave theory, and exact diagonalization to study the spin dynamics in the perfect triangularlattice antiferromagnet (TLAF) CsCeSe2. This material orders into a stripe phase, which is demonstrated to arise as a consequence of the off-diagonal bond-dependent terms in the spin Hamiltonian. By studying the spin dynamics at intermediate fields, we identify an interaction between the single-magnon state and the two-magnon continuum that causes decay of coherent magnon excitations, level repulsion, and transfer of spectral weight to the continuum that are controlled by the strength of the magnetic field. Our results provide a microscopic mechanism for the stabilization of the stripe phase in TLAF and show how complex many-body physics can be present in the spin dynamics in a magnet with strong Kitaev coupling even in an ordered ground state.

SCI

英语

其他

National Natural Science Foundation of China[12304187] ; Songshan Lake Materials Laboratory[2023SLABFN30] ; Guangzhou Basic and Applied Basic Research Funds[2024A04J4024] ; Fundamental Research Funds for the Central Universities, Sun Yat-sen University[23qnpy57] ; U.S. Department of Energy (DOE)[DE-SC0021221]

Physics

Physics, Multidisciplinary

WOS:001306779300003

AMER PHYSICAL SOC

Web of Science

1.Sun Yat Sen Univ, Ctr Neutron Sci & Technol, Sch Phys, Guangdong Prov Key Lab Magnetoelect Phys & Devices, Guangzhou 510275, Guangdong, Peoples R China
2.Oak Ridge Natl Lab, Neutron Scattering Div, Oak Ridge, TN 37831 USA
3.Paul Scherrer Inst PSI, Lab Theoret & Computat Phys, CH-5232 Villigen, Switzerland
4.Oak Ridge Natl Lab, Mat Sci & Technol Div, Oak Ridge, TN 37831 USA
5.Southern Univ Sci & Technol, Dept Phys, Shenzhen 518055, Guangdong, Peoples R China
6.Leibniz Inst Festkorper & Werkstoffforsch IFW Dres, Helmholtzstr 20, D-01069 Dresden, Germany
7.Southern Univ Sci & Technol, Acad Adv Interdisciplinary Studies, Shenzhen 518055, Guangdong, Peoples R China
8.Univ Calif Irvine, Dept Phys & Astron, Irvine, CA 92697 USA
9.Ecole Polytech Fed Lausanne EPFL, Inst Phys, CH-1015 Lausanne, Switzerland
10.Paul Scherrer Inst, Lab Neutron Scattering & Imaging, CH-5232 Villigen, Switzerland

Xie, Tao,Gozel, S.,Xing, Jie,et al. Quantum Spin Dynamics Due to Strong Kitaev Interactions in the Triangular-Lattice Antiferromagnet CsCeSe₂ [J]. PHYSICAL REVIEW LETTERS,2024,133(9).

Xie, Tao.,Gozel, S..,Xing, Jie.,Zhao, N..,Avdoshenko, S. M..,...&Nikitin, S. E..(2024).Quantum Spin Dynamics Due to Strong Kitaev Interactions in the Triangular-Lattice Antiferromagnet CsCeSe₂ .PHYSICAL REVIEW LETTERS,133(9).

Xie, Tao,et al."Quantum Spin Dynamics Due to Strong Kitaev Interactions in the Triangular-Lattice Antiferromagnet CsCeSe₂ ".PHYSICAL REVIEW LETTERS 133.9(2024).