Universität zu Köln

Wang, Zhe ORCID: 0000-0001-7464-5408, Schmidt, M., Loidl, A., Wu, Jianda ORCID: 0000-0002-3571-3348, Zou, Haiyuan ORCID: 0000-0002-7551-0297, Yang, Wang, Dong, Chao, Kohama, Y., Kindo, K., Gorbunov, D., I, Niesen, S., Breunig, O., Engelmayer, J. and Lorenz, T. (2019). Quantum Critical Dynamics of a Heisenberg-Ising Chain in a Longitudinal Field: Many-Body Strings versus Fractional Excitations. Phys. Rev. Lett., 123 (6). COLLEGE PK: AMER PHYSICAL SOC. ISSN 1079-7114

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Abstract

We report a high-resolution terahertz spectroscopic study of quantum spin dynamics in the antiferromagnetic Heisenberg-Ising spin-chain compound BaCo2V2O8 as a function of temperature and longitudinal magnetic field. Confined spinon excitations are observed in an antiferromagnetic phase below T-N similar or equal to 5.5 K. In a field-induced gapless phase above B-c = 3.8 T, we identify many-body string excitations as well as low-energy fractional psinon or antipsinon excitations by comparing to Bethe ansatz calculations. In the vicinity of B-c, the high-energy string excitations are found to have a dominant contribution to the spin dynamics as compared with the fractional excitations.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Wang, Zhe UNSPECIFIED orcid.org/0000-0001-7464-5408 UNSPECIFIED Schmidt, M. UNSPECIFIED UNSPECIFIED UNSPECIFIED Loidl, A. UNSPECIFIED UNSPECIFIED UNSPECIFIED Wu, Jianda UNSPECIFIED orcid.org/0000-0002-3571-3348 UNSPECIFIED Zou, Haiyuan UNSPECIFIED orcid.org/0000-0002-7551-0297 UNSPECIFIED Yang, Wang UNSPECIFIED UNSPECIFIED UNSPECIFIED Dong, Chao UNSPECIFIED UNSPECIFIED UNSPECIFIED Kohama, Y. UNSPECIFIED UNSPECIFIED UNSPECIFIED Kindo, K. UNSPECIFIED UNSPECIFIED UNSPECIFIED Gorbunov, D., I UNSPECIFIED UNSPECIFIED UNSPECIFIED Niesen, S. UNSPECIFIED UNSPECIFIED UNSPECIFIED Breunig, O. UNSPECIFIED UNSPECIFIED UNSPECIFIED Engelmayer, J. UNSPECIFIED UNSPECIFIED UNSPECIFIED Lorenz, T. UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-144753
DOI:	10.1103/PhysRevLett.123.067202
Journal or Publication Title:	Phys. Rev. Lett.
Volume:	123
Number:	6
Date:	2019
Publisher:	AMER PHYSICAL SOC
Place of Publication:	COLLEGE PK
ISSN:	1079-7114
Language:	English
Faculty:	Faculty of Mathematics and Natural Sciences
Divisions:	Faculty of Mathematics and Natural Sciences > Department of Physics > Institute of Physics II
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language MAGNETIC-PROPERTIES; BETHE-ANSATZ; STATES; SPIN Multiple languages Physics, Multidisciplinary Multiple languages
Refereed:	Yes
URI:	http://kups.ub.uni-koeln.de/id/eprint/14475