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

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

45 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

Access to Document

10.1103/PhysRevLett.123.067202

Cite this

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",

issn = "0031-9007",

publisher = "American Physical Society",

number = "6",

}

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

Abstract

Access to Document

Other files and links

Fingerprint

Cite this