Quasiparticle-continuum level repulsion in a quantum magnet

Plumb, K. W.; Hwang, Kyusung; Qiu, Y.; Harriger, Leland W.; Granroth, G. Â E.; Kolesnikov, Alexander I.; Shu, G. J.; Chou, F. C.; Rüegg, Ch.; Kim, Yong Baek; Kim, Young-June

doi:10.1038/nphys3566

Title: Quasiparticle-continuum level repulsion in a quantum magnet

Journal Article · Mon Nov 30 00:00:00 EST 2015 · Nature Physics

DOI:https://doi.org/10.1038/nphys3566· OSTI ID:1265876

Plumb, K. W. ^[1]; Hwang, Kyusung ^[1]; Qiu, Y. ^[2]; Harriger, Leland W. ^[3];

^[4]; Kolesnikov, Alexander I. ^[4]; Shu, G. J. ^[5]; Chou, F. C. ^[5]; Rüegg, Ch. ^[6]; Kim, Yong Baek ^[1]; Kim, Young-June ^[1]

Univ. of Toronto, ON (Canada)
National Inst. of Standards and Technology (NIST), Gaithersburg, MD (United States); Univ. of Maryland, College Park, MD (United States)
National Inst. of Standards and Technology (NIST), Gaithersburg, MD (United States)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
National Taiwan Univ., Taipei (Taiwan)
Paul Scherrer Inst., Villigen (Switzerland). Lab. for Neutron Scattering and Imaging

When the energy eigenvalues of two coupled quantum states approach each other in a certain parameter space, their energy levels repel each other and level crossing is avoided. Such level repulsion, or avoided level crossing, is commonly used to describe the dispersion relation of quasiparticles in solids. But, little is known about the level repulsion when more than two quasiparticles are present; for example, in a strongly interacting quantum system where a quasiparticle can spontaneously decay into a many-particle continuum. Here we show that even in this case level repulsion exists between a long-lived quasiparticle state and a continuum. Here, we observe a renormalization of the quasiparticle dispersion relation due to the presence of the continuum of multi-quasiparticle states, in our fine-resolution neutron spectroscopy study of magnetic quasiparticles in the frustrated quantum magnet BiCu₂PO₆.

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Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States). Spallation Neutron Source (SNS)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: AC05-00OR22725; DMR-0944772

OSTI ID:: 1265876

Journal Information:: Nature Physics, Vol. 12, Issue 3; ISSN 1745-2473

Publisher:: Nature Publishing Group (NPG)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 29 works

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