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Journal Article

Tomonaga-Luttinger Liquid Spin Dynamics in the Quasi-One-Dimensional Ising-Like Antiferromagnet BaCo2V2O8

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Takayoshi,  Shintaro
Max Planck Institute for the Physics of Complex Systems, Max Planck Society;

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Citation

Faure, Q., Takayoshi, S., Simonet, V., Grenier, B., Mansson, M., White, J. S., et al. (2019). Tomonaga-Luttinger Liquid Spin Dynamics in the Quasi-One-Dimensional Ising-Like Antiferromagnet BaCo2V2O8. Physical Review Letters, 123(2): 027204. doi:10.1103/PhysRevLett.123.027204.


Cite as: https://hdl.handle.net/21.11116/0000-0004-A13C-3
Abstract
Combining inelastic neutron scattering and numerical simulations, we study the quasi-one-dimensional Ising anisotropic quantum antiferromagnet BaCo2V2O8 in a longitudinal magnetic field. This material shows a quantum phase transition from a Neel ordered phase at zero field to a longitudinal incommensurate spin density wave at a critical magnetic field of 3.8 T. Concomitantly, the excitation gap almost closes and a fundamental reconfiguration of the spin dynamics occurs. These experimental results are well described by the universal Tomonaga-Luttinger liquid theory developed for interacting spinless fermions in one dimension. We especially observe the rise of mainly longitudinal excitations, a hallmark of the unconventional low-field regime in Ising-like quantum antiferromagnetic chains.