Quantum Critical Dynamics of a Heisenberg-Ising Chain in a Longitudinal Field: Many-Body Strings versus Fractional Excitations

Zhe Wang; M. Schmidt; A. Loidl; Jianda Wu; Haiyuan Zou; Wang Yang; Chao Dong; Y. Kohama; K. Kindo; D. I. Gorbunov; S. Niesen; O. Breunig; J. Engelmayer; T. Lorenz

doi:10.1103/PhysRevLett.123.067202

Quantum Critical Dynamics of a Heisenberg-Ising Chain in a Longitudinal Field: Many-Body Strings versus Fractional Excitations

Zhe Wang
, M. Schmidt
, A. Loidl
, Jianda Wu
, Haiyuan Zou
, Wang Yang
, Chao Dong
, Y. Kohama
, K. Kindo
, D. I. Gorbunov
, S. Niesen
, O. Breunig
, J. Engelmayer
, T. Lorenz

Institute of Radiation Physics
Helmholtz-Zentrum Dresden-Rossendorf
Institute of Phy. II
University of Cologne
Experimental Physics v
Augsburg University
Tsung-Dao Lee Institute and School of Physics and Astronomy
Shanghai Jiao Tong University
Quantum Matter Institute
University of British Columbia
Institute for Solid State Physics
The University of Tokyo
Wuhan National High Magnetic Field Center and School of Physics
Huazhong University of Science and Technology
Institute of Physics II

Research output: Contribution to journal › Article › peer-review

49 Scopus citations

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 TN≃5.5 K. In a field-induced gapless phase above Bc=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 Bc, the high-energy string excitations are found to have a dominant contribution to the spin dynamics as compared with the fractional excitations.

Original language	English
Article number	067202
Journal	Physical Review Letters
Volume	123
Issue number	6
DOIs	https://doi.org/10.1103/PhysRevLett.123.067202
State	Published - 6 Aug 2019
Externally published	Yes

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10.1103/PhysRevLett.123.067202

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Wang, Z., Schmidt, M., Loidl, A., Wu, J., Zou, H., Yang, W., Dong, C., Kohama, Y., Kindo, K., Gorbunov, D. I., Niesen, S., Breunig, O., Engelmayer, J., & Lorenz, T. (2019). Quantum Critical Dynamics of a Heisenberg-Ising Chain in a Longitudinal Field: Many-Body Strings versus Fractional Excitations. Physical Review Letters, 123(6), Article 067202. https://doi.org/10.1103/PhysRevLett.123.067202

@article{bc66a4a7b75b4ba8b3d4af5af090fc05,

title = "Quantum Critical Dynamics of a Heisenberg-Ising Chain in a Longitudinal Field: Many-Body Strings versus Fractional Excitations",

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 TN≃5.5 K. In a field-induced gapless phase above Bc=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 Bc, the high-energy string excitations are found to have a dominant contribution to the spin dynamics as compared with the fractional excitations.",

author = "Zhe Wang and M. Schmidt and A. Loidl and Jianda Wu and Haiyuan Zou and Wang Yang and Chao Dong and Y. Kohama and K. Kindo and Gorbunov, \{D. I.\} and S. Niesen and O. Breunig and J. Engelmayer and T. Lorenz",

note = "Publisher Copyright: {\textcopyright} 2019 American Physical Society.",

year = "2019",

month = aug,

day = "6",

doi = "10.1103/PhysRevLett.123.067202",

language = "英语",

volume = "123",

journal = "Physical Review Letters",

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Wang, Z, Schmidt, M, Loidl, A, Wu, J, Zou, H, Yang, W, Dong, C, Kohama, Y, Kindo, K, Gorbunov, DI, Niesen, S, Breunig, O, Engelmayer, J & Lorenz, T 2019, 'Quantum Critical Dynamics of a Heisenberg-Ising Chain in a Longitudinal Field: Many-Body Strings versus Fractional Excitations', Physical Review Letters, vol. 123, no. 6, 067202. https://doi.org/10.1103/PhysRevLett.123.067202

TY - JOUR

T1 - Quantum Critical Dynamics of a Heisenberg-Ising Chain in a Longitudinal Field

T2 - Many-Body Strings versus Fractional Excitations

AU - Wang, Zhe

AU - Schmidt, M.

AU - Loidl, A.

AU - Wu, Jianda

AU - Zou, Haiyuan

AU - Yang, Wang

AU - Dong, Chao

AU - Kohama, Y.

AU - Kindo, K.

AU - Gorbunov, D. I.

AU - Niesen, S.

AU - Breunig, O.

AU - Engelmayer, J.

AU - Lorenz, T.

PY - 2019/8/6

Y1 - 2019/8/6

N2 - 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 TN≃5.5 K. In a field-induced gapless phase above Bc=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 Bc, the high-energy string excitations are found to have a dominant contribution to the spin dynamics as compared with the fractional excitations.

AB - 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 TN≃5.5 K. In a field-induced gapless phase above Bc=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 Bc, the high-energy string excitations are found to have a dominant contribution to the spin dynamics as compared with the fractional excitations.

UR - https://www.scopus.com/pages/publications/85070542180

U2 - 10.1103/PhysRevLett.123.067202

DO - 10.1103/PhysRevLett.123.067202

M3 - 文章

C2 - 31491175

AN - SCOPUS:85070542180

SN - 0031-9007

VL - 123

JO - Physical Review Letters

JF - Physical Review Letters

IS - 6

M1 - 067202

ER -

Quantum Critical Dynamics of a Heisenberg-Ising Chain in a Longitudinal Field: Many-Body Strings versus Fractional Excitations

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