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Hasegawa S, Kikuchi H, Asai S, Wei Z, Winn B, Sala G, Itoh S, Masuda T. Field control of quasiparticle decay in a quantum antiferromagnet. Nat Commun 2024; 15:125. [PMID: 38212625 PMCID: PMC10784460 DOI: 10.1038/s41467-023-44435-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/13/2022] [Accepted: 12/13/2023] [Indexed: 01/13/2024] Open
Abstract
Dynamics in a quantum material is described by quantized collective motion: a quasiparticle. The single-quasiparticle description is useful for a basic understanding of the system, whereas a phenomenon beyond the simple description such as quasiparticle decay which affects the current carried by the quasiparticle is an intriguing topic. The instability of the quasiparticle is phenomenologically determined by the magnitude of the repulsive interaction between a single quasiparticle and the two-quasiparticle continuum. Although the phenomenon has been studied in several materials, thermodynamic tuning of the quasiparticle decay in a single material has not yet been investigated. Here we show, by using neutron scattering, magnetic field control of the magnon decay in a quantum antiferromagnet RbFeCl3, where the interaction between the magnon and continuum is tuned by the field. At low fields where the interaction is small, the single magnon decay process is observed. In contrast, at high fields where the interaction exceeds a critical magnitude, the magnon is pushed downwards in energy and its lifetime increases. Our study demonstrates that field control of quasiparticle decay is possible in the system where the two-quasiparticle continuum covers wide momentum-energy space, and the phenomenon of the magnon avoiding decay is ubiquitous.
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Affiliation(s)
- Shunsuke Hasegawa
- Institute for Solid State Physics, The University of Tokyo, Chiba, 277-8581, Japan
| | - Hodaka Kikuchi
- Institute for Solid State Physics, The University of Tokyo, Chiba, 277-8581, Japan
| | - Shinichiro Asai
- Institute for Solid State Physics, The University of Tokyo, Chiba, 277-8581, Japan
| | - Zijun Wei
- Institute for Solid State Physics, The University of Tokyo, Chiba, 277-8581, Japan
| | - Barry Winn
- Neutron Scattering Division, Oak Ridge National Laboratory, Oak Ridge, TN, 37831, USA
| | - Gabriele Sala
- Neutron Scattering Division, Oak Ridge National Laboratory, Oak Ridge, TN, 37831, USA
| | - Shinichi Itoh
- Institute of Materials Structure Science, High Energy Accelerator Research Organization, Ibaraki, 305-0801, Japan
| | - Takatsugu Masuda
- Institute for Solid State Physics, The University of Tokyo, Chiba, 277-8581, Japan.
- Institute of Materials Structure Science, High Energy Accelerator Research Organization, Ibaraki, 305-0801, Japan.
- Trans-scale Quantum Science Institute, The University of Tokyo, Tokyo, 113-0033, Japan.
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Xian Y. Longitudinal excitations in quantum antiferromagnets. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2011; 23:346003. [PMID: 21841234 DOI: 10.1088/0953-8984/23/34/346003] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
By extending our recently proposed magnon-density waves to low dimensions, we investigate, using a microscopic many-body approach, the longitudinal excitations of the quasi-one-dimensional (quasi-1d) and quasi-2d Heisenberg antiferromagnetic systems on a bipartite lattice with a general spin quantum number. We obtain the full energy spectrum of the longitudinal mode as a function of the coupling constants in the original lattice Hamiltonian and find that it always has a nonzero energy gap if the ground state has a long-range order and becomes gapless for the pure isotropic 1d model. The numerical value of the minimum gap in our approximation agrees with that of a longitudinal mode observed in the quasi-1d antiferromagnetic compound KCuF3 at low temperature. It will be interesting to compare values of the energy spectrum at other momenta if their experimental results are available.
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Affiliation(s)
- Y Xian
- School of Physics and Astronomy, University of Manchester, Manchester M13 9PL, UK
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Zhitomirsky ME, Zaliznyak IA. Static properties of a quasi-one-dimensional antiferromagnet in a magnetic field. PHYSICAL REVIEW. B, CONDENSED MATTER 1996; 53:3428-3435. [PMID: 9983855 DOI: 10.1103/physrevb.53.3428] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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Trudeau Y, Sénéchal D, Poirier M. Temperature dependence of the ESR spectrum of CsNiCl3. PHYSICAL REVIEW. B, CONDENSED MATTER 1995; 51:334-341. [PMID: 9977094 DOI: 10.1103/physrevb.51.334] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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Plumer ML, Mailhot A. Tricritical behavior of the frustrated XY antiferromagnet. PHYSICAL REVIEW. B, CONDENSED MATTER 1994; 50:16113-16116. [PMID: 9975992 DOI: 10.1103/physrevb.50.16113] [Citation(s) in RCA: 21] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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Zaliznyak IA, Regnault L, Petitgrand D. Neutron-scattering study of the dynamic spin correlations in CsNiCl3 above Néel ordering. PHYSICAL REVIEW. B, CONDENSED MATTER 1994; 50:15824-15833. [PMID: 9975950 DOI: 10.1103/physrevb.50.15824] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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Nelson DF, Chen B. Lagrangian treatment of magnetic dielectrics. PHYSICAL REVIEW. B, CONDENSED MATTER 1994; 50:1023-1038. [PMID: 9975770 DOI: 10.1103/physrevb.50.1023] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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Trudeau Y, Plumer ML, Poirier M, Caillé A. ANGULAR DEPENDENCE OF THE H-T PHASE DIAGRAM OF CsNiCl3. PHYSICAL REVIEW. B, CONDENSED MATTER 1993; 48:12805-12812. [PMID: 10007653 DOI: 10.1103/physrevb.48.12805] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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Tun Z, Lussier JG, Erwin RW, Lynn JW, Harrison A. Polarization analysis of magnetic excitations in CsMnI3. PHYSICAL REVIEW. B, CONDENSED MATTER 1993; 48:6152-6155. [PMID: 10009155 DOI: 10.1103/physrevb.48.6152] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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Affleck I, Wellman GF. Longitudinal modes in quasi-one-dimensional antiferromagnets. PHYSICAL REVIEW. B, CONDENSED MATTER 1992; 46:8934-8953. [PMID: 10002678 DOI: 10.1103/physrevb.46.8934] [Citation(s) in RCA: 21] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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