E_{8} Spectra of Quasi-One-Dimensional Antiferromagnet BaCo_{2}V_{2}O_{8} under Transverse Field

Haiyuan Zou¹, Yi Cui², Xiao Wang¹, Z Zhang¹, J Yang¹, G Xu³, A Okutani⁴, M Hagiwara⁴, M Matsuda⁵, G Wang⁶, Giuseppe Mussardo⁷, K Hódsági⁸, M Kormos⁹, Zhangzhen He¹⁰, S Kimura¹¹, Rong Yu², Weiqiang Yu², Jie Ma¹², Jianda Wu^{1

13}

Affiliations

¹ Tsung-Dao Lee Institute, Shanghai Jiao Tong University, Shanghai 200240, China.
² Department of Physics and Beijing Key Laboratory of Opto-electronic Functional Materials and Micro-nano Devices, Renmin University of China, Beijing 100872, China.
³ NIST Center for Neutron Research, National Institute of Standards and Technology, Gaithersburg, Maryland 20899-6102, USA.
⁴ Center for Advanced High Magnetic Field Science, Graduate School of Science, Osaka University, Toyonaka, Osaka 560-0043, Japan.
⁵ Neutron Scattering Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA.
⁶ Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China.
⁷ SISSA and INFN, Sezione di Trieste, Via Bonomea 265, I-34136 Trieste, Italy.
⁸ BME-MTA Statistical Field Theory Research Group, Institute of Physics, Budapest University of Technology and Economics, 1111 Budapest, Budafoki út 8, Hungary.
⁹ MTA-BME Quantum Dynamics and Correlations Research Group, Department of Theoretical Physics, Budapest University of Technology and Economics, 1111 Budapest, Budafoki út 8, Hungary.
¹⁰ State Key Laboratory of Structural Chemistry, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou, Fujian 350002, China.
¹¹ Institute for Materials Research, Tohoku University, Sendai, Miyagi 980-8577, Japan.
¹² Key Laboratory of Artificial Structures and Quantum Control (Ministry of Education), Shenyang National Laboratory for Materials Science, School of Physics and Astronomy, Shanghai Jiao Tong University, Shanghai 200240, China.
¹³ School of Physics and Astronomy, Shanghai Jiao Tong University, Shanghai 200240, China.

PMID: 34459637
DOI: 10.1103/PhysRevLett.127.077201

E_{8} Spectra of Quasi-One-Dimensional Antiferromagnet BaCo_{2}V_{2}O_{8} under Transverse Field

Haiyuan Zou et al. Phys Rev Lett. 2021.

. 2021 Aug 13;127(7):077201.

doi: 10.1103/PhysRevLett.127.077201.

Authors

Affiliations

¹ Tsung-Dao Lee Institute, Shanghai Jiao Tong University, Shanghai 200240, China.
² Department of Physics and Beijing Key Laboratory of Opto-electronic Functional Materials and Micro-nano Devices, Renmin University of China, Beijing 100872, China.
³ NIST Center for Neutron Research, National Institute of Standards and Technology, Gaithersburg, Maryland 20899-6102, USA.
⁴ Center for Advanced High Magnetic Field Science, Graduate School of Science, Osaka University, Toyonaka, Osaka 560-0043, Japan.
⁵ Neutron Scattering Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA.
⁶ Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China.
⁷ SISSA and INFN, Sezione di Trieste, Via Bonomea 265, I-34136 Trieste, Italy.
⁸ BME-MTA Statistical Field Theory Research Group, Institute of Physics, Budapest University of Technology and Economics, 1111 Budapest, Budafoki út 8, Hungary.
⁹ MTA-BME Quantum Dynamics and Correlations Research Group, Department of Theoretical Physics, Budapest University of Technology and Economics, 1111 Budapest, Budafoki út 8, Hungary.
¹⁰ State Key Laboratory of Structural Chemistry, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou, Fujian 350002, China.
¹¹ Institute for Materials Research, Tohoku University, Sendai, Miyagi 980-8577, Japan.
¹² Key Laboratory of Artificial Structures and Quantum Control (Ministry of Education), Shenyang National Laboratory for Materials Science, School of Physics and Astronomy, Shanghai Jiao Tong University, Shanghai 200240, China.
¹³ School of Physics and Astronomy, Shanghai Jiao Tong University, Shanghai 200240, China.

PMID: 34459637
DOI: 10.1103/PhysRevLett.127.077201

Abstract

We report ^{51}V NMR and inelastic neutron scattering (INS) measurements on a quasi-1D antiferromagnet BaCo_{2}V_{2}O_{8} under transverse field along the [010] direction. The scaling behavior of the spin-lattice relaxation rate above the Néel temperatures unveils a 1D quantum critical point (QCP) at H_{c}^{1D}≈4.7 T, which is masked by the 3D magnetic order. With the aid of accurate analytical analysis and numerical calculations, we show that the zone center INS spectrum at H_{c}^{1D} is precisely described by the pattern of the 1D quantum Ising model in a magnetic field, a class of universality described in terms of the exceptional E_{8} Lie algebra. These excitations are nondiffusive over a certain field range when the system is away from the 1D QCP. Our results provide an unambiguous experimental realization of the massive E_{8} phase in the compound, and open a new experimental route for exploring the dynamics of quantum integrable systems as well as physics beyond integrability.

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E_{8} Spectra of Quasi-One-Dimensional Antiferromagnet BaCo_{2}V_{2}O_{8} under Transverse Field

Affiliations

E_{8} Spectra of Quasi-One-Dimensional Antiferromagnet BaCo_{2}V_{2}O_{8} under Transverse Field

Authors

Affiliations

Abstract

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