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Quantum Critical Dynamics of a Heisenberg-Ising Chain in a Longitudinal Field: Many-Body Strings versus Fractional Excitations.
Wang, Zhe; Schmidt, M; Loidl, A; Wu, Jianda; Zou, Haiyuan; Yang, Wang; Dong, Chao; Kohama, Y; Kindo, K; Gorbunov, D I; Niesen, S; Breunig, O; Engelmayer, J; Lorenz, T.
Afiliación
  • Wang Z; Institute of Radiation Physics, Helmholtz-Zentrum Dresden-Rossendorf, 01328 Dresden, Germany.
  • Schmidt M; Experimental Physics V, Center for Electronic Correlations and Magnetism, Institute of Physics, University of Augsburg, 86135 Augsburg, Germany.
  • Loidl A; Experimental Physics V, Center for Electronic Correlations and Magnetism, Institute of Physics, University of Augsburg, 86135 Augsburg, Germany.
  • Wu J; Tsung-Dao Lee Institute and School of Physics and Astronomy, Shanghai Jiao Tong University, Shanghai 200240, China.
  • Zou H; Tsung-Dao Lee Institute and School of Physics and Astronomy, Shanghai Jiao Tong University, Shanghai 200240, China.
  • Yang W; Stewart Blusson Quantum Matter Institute, University of British Columbia, Vancouver, Canada.
  • Dong C; Institute for Solid State Physics, University of Tokyo, Kashiwa, Chiba 277-8581, Japan.
  • Kohama Y; Wuhan National High Magnetic Field Center and School of Physics, Huazhong University of Science and Technology, Wuhan 430074, China.
  • Kindo K; Institute for Solid State Physics, University of Tokyo, Kashiwa, Chiba 277-8581, Japan.
  • Gorbunov DI; Institute for Solid State Physics, University of Tokyo, Kashiwa, Chiba 277-8581, Japan.
  • Niesen S; Dresden High Magnetic Field Laboratory (HLD-EMFL), Helmholtz-Zentrum Dresden-Rossendorf, 01328 Dresden, Germany.
  • Breunig O; Institute of Physics II, University of Cologne, 50937 Cologne, Germany.
  • Engelmayer J; Institute of Physics II, University of Cologne, 50937 Cologne, Germany.
  • Lorenz T; Institute of Physics II, University of Cologne, 50937 Cologne, Germany.
Phys Rev Lett ; 123(6): 067202, 2019 Aug 09.
Article en En | MEDLINE | ID: mdl-31491175
We report a high-resolution terahertz spectroscopic study of quantum spin dynamics in the antiferromagnetic Heisenberg-Ising spin-chain compound BaCo_{2}V_{2}O_{8} as a function of temperature and longitudinal magnetic field. Confined spinon excitations are observed in an antiferromagnetic phase below T_{N}≃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.
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Idioma: En Revista: Phys Rev Lett Año: 2019 Tipo del documento: Article País de afiliación: Alemania Pais de publicación: Estados Unidos
Texto completo
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Idioma: En Revista: Phys Rev Lett Año: 2019 Tipo del documento: Article País de afiliación: Alemania Pais de publicación: Estados Unidos