Universität zu Köln

Bera, Anup Kumar ORCID: 0000-0003-0222-0990, Wu, Jianda ORCID: 0000-0002-3571-3348, Yang, Wang, Bewley, Robert, Boehm, Martin, Xu, Jianhui, Bartkowiak, Maciej ORCID: 0000-0003-1974-1493, Prokhnenko, Oleksandr, Klemke, Bastian, Islam, A. T. M. Nazmul, Law, Joseph Mathew, Wang, Zhe ORCID: 0000-0001-7464-5408 and Lake, Bella ORCID: 0000-0003-0034-0964 (2020). Dispersions of many-body Bethe strings. Nat. Phys., 16 (6). S. 625 - 633. LONDON: NATURE PUBLISHING GROUP. ISSN 1745-2481

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Abstract

Complex bound states of magnetic excitations, known as Bethe strings, were predicted almost a century ago to exist in one-dimensional quantum magnets(1). The dispersions of the string states have so far remained the subject of intense theoretical studies(2-7). Here, by performing neutron scattering experiments on the one-dimensional Heisenberg-Ising antiferromagnet SrCo2V2O8 in high longitudinal magnetic fields, we reveal in detail the dispersion relations of the string states over the full Brillouin zone, as well as their magnetic field dependencies. Furthermore, the characteristic energy, the scattering intensity and linewidth of the observed string states exhibit excellent agreement with our precise Bethe-ansatz calculations. Our results establish the important role of string states in the quantum spin dynamics of one-dimensional systems, and will invoke studies of their dynamical properties in more general many-body systems. In one-dimensional quantum magnets, complex bound states of magnetic excitations known as Bethe strings have long been predicted. Now, a detailed neutron scattering study of SrCo2V2O8 reveals their magnetic-field-dependent dispersion relation.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Bera, Anup Kumar UNSPECIFIED orcid.org/0000-0003-0222-0990 UNSPECIFIED Wu, Jianda UNSPECIFIED orcid.org/0000-0002-3571-3348 UNSPECIFIED Yang, Wang UNSPECIFIED UNSPECIFIED UNSPECIFIED Bewley, Robert UNSPECIFIED UNSPECIFIED UNSPECIFIED Boehm, Martin UNSPECIFIED UNSPECIFIED UNSPECIFIED Xu, Jianhui UNSPECIFIED UNSPECIFIED UNSPECIFIED Bartkowiak, Maciej UNSPECIFIED orcid.org/0000-0003-1974-1493 UNSPECIFIED Prokhnenko, Oleksandr UNSPECIFIED UNSPECIFIED UNSPECIFIED Klemke, Bastian UNSPECIFIED UNSPECIFIED UNSPECIFIED Islam, A. T. M. Nazmul UNSPECIFIED UNSPECIFIED UNSPECIFIED Law, Joseph Mathew UNSPECIFIED UNSPECIFIED UNSPECIFIED Wang, Zhe UNSPECIFIED orcid.org/0000-0001-7464-5408 UNSPECIFIED Lake, Bella UNSPECIFIED orcid.org/0000-0003-0034-0964 UNSPECIFIED
URN:	urn:nbn:de:hbz:38-337542
DOI:	10.1038/s41567-020-0835-7
Journal or Publication Title:	Nat. Phys.
Volume:	16
Number:	6
Page Range:	S. 625 - 633
Date:	2020
Publisher:	NATURE PUBLISHING GROUP
Place of Publication:	LONDON
ISSN:	1745-2481
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language QUANTUM CRITICALITY; NEUTRON-SCATTERING; FORM-FACTORS; HEISENBERG; S=1/2; METAL; SPIN Multiple languages Physics, Multidisciplinary Multiple languages
URI:	http://kups.ub.uni-koeln.de/id/eprint/33754