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Field induced spontaneous quasiparticle decay and renormalization of quasiparticle dispersion in a quantum antiferromagnet
- Source :
- Nature communications, vol 8, iss 1, Nature Communications, Vol 8, Iss 1, Pp 1-8 (2017), Nature Communications, Hong, T; Qiu, Y; Matsumoto, M; Tennant, DA; Coester, K; Schmidt, KP; et al.(2017). Field induced spontaneous quasiparticle decay and renormalization of quasiparticle dispersion in a quantum antiferromagnet. Nature Communications, 8, 15148. doi: 10.1038/ncomms15148. UC Irvine: Retrieved from: http://www.escholarship.org/uc/item/1gh4m8zt
- Publication Year :
- 2017
- Publisher :
- eScholarship, University of California, 2017.
-
Abstract
- The notion of a quasiparticle, such as a phonon, a roton, or a magnon, is used in modern condensed matter physics to describe an elementary collective excitation. The intrinsic zero-temperature magnon damping in quantum spin systems can be driven by the interaction of the one-magnon states and multi-magnon continuum. However, detailed experimental studies on this quantum many-body effect induced by an applied magnetic field are rare. Here we present a high-resolution neutron scattering study in high fields on an S=1/2 antiferromagnet C9H18N2CuBr4. Compared with the non-interacting linear spin-wave theory, our results demonstrate a variety of phenomena including field-induced renormalization of one-magnon dispersion, spontaneous magnon decay observed via intrinsic linewidth broadening, unusual non-Lorentzian two-peak structure in the excitation spectra, and a dramatic shift of spectral weight from one-magnon state to the two-magnon continuum.<br />8 pages, 6 figures, some typos were corrected in the revised version
- Subjects :
- Phonon
Science
FOS: Physical sciences
General Physics and Astronomy
02 engineering and technology
Neutron scattering
Roton
01 natural sciences
7. Clean energy
Article
General Biochemistry, Genetics and Molecular Biology
Renormalization
Condensed Matter::Materials Science
Condensed Matter - Strongly Correlated Electrons
0103 physical sciences
010306 general physics
Quantum
Physics
Condensed Matter - Materials Science
Multidisciplinary
Strongly Correlated Electrons (cond-mat.str-el)
Condensed matter physics
Condensed Matter::Other
Magnon
Materials Science (cond-mat.mtrl-sci)
General Chemistry
021001 nanoscience & nanotechnology
cond-mat.mtrl-sci
Quantum electrodynamics
Quasiparticle
Condensed Matter::Strongly Correlated Electrons
cond-mat.str-el
0210 nano-technology
Excitation
Subjects
Details
- Database :
- OpenAIRE
- Journal :
- Nature communications, vol 8, iss 1, Nature Communications, Vol 8, Iss 1, Pp 1-8 (2017), Nature Communications, Hong, T; Qiu, Y; Matsumoto, M; Tennant, DA; Coester, K; Schmidt, KP; et al.(2017). Field induced spontaneous quasiparticle decay and renormalization of quasiparticle dispersion in a quantum antiferromagnet. Nature Communications, 8, 15148. doi: 10.1038/ncomms15148. UC Irvine: Retrieved from: http://www.escholarship.org/uc/item/1gh4m8zt
- Accession number :
- edsair.doi.dedup.....9f7e38199edb61ca4bd4ce2318f20228