Tomonaga-Luttinger Liquid Spin Dynamics in the Quasi-One-Dimensional Ising-Like Antiferromagnet BaCo2V2O8
| Autor: | Jonathan S. White, Quentin Faure, Virginie Simonet, S. Petit, P. Lejay, Christian Rüegg, Shintaro Takayoshi, Gregory Tucker, B. Grenier, Thierry Giamarchi, Martin Månsson |
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| Rok vydání: | 2019 |
| Předmět: |
Physics
Quantum phase transition Condensed matter physics General Physics and Astronomy Fermion 01 natural sciences Inelastic neutron scattering Luttinger liquid 0103 physical sciences Antiferromagnetism Spin density wave Condensed Matter::Strongly Correlated Electrons Ising model 010306 general physics Excitation |
| Zdroj: | Physical Review Letters. 123 |
| ISSN: | 1079-7114 0031-9007 |
| Popis: | Combining inelastic neutron scattering and numerical simulations, we study the quasi-one-dimensional Ising anisotropic quantum antiferromagnet ${\mathrm{BaCo}}_{2}{\mathrm{V}}_{2}{\mathrm{O}}_{8}$ in a longitudinal magnetic field. This material shows a quantum phase transition from a N\'eel 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. |
| Databáze: | OpenAIRE |
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