Solitonic excitations in the Ising anisotropic chain BaCo2 V2O8 under large transverse magnetic field
- Resource Type
- Authors
- Faure, Quentin; Takayoshi, Shintaro; Grenier, Béatrice; Petit, Sylvain; Raymond, Stéphane; Boehm, Martin; Lejay, Pascal; Giamarchi, Thierry; Simonet, Virginie
- Source
- Physical Review Research
Physical Review Research, 2021, 3 (4), pp.043227. ⟨10.1103/PhysRevResearch.3.043227⟩
'Physical Review Research ', vol: 3, pages: 043227-1-043227-12 (2021)
Physical review research, Vol. 3 (2021) P. 043227
- Subject
- Condensed Matter - Strongly Correlated Electrons
Strongly Correlated Electrons (cond-mat.str-el)
[PHYS.COND.CM-MS]Physics [physics]/Condensed Matter [cond-mat]/Materials Science [cond-mat.mtrl-sci]
FOS: Physical sciences
Condensed Matter::Strongly Correlated Electrons
ddc:500.2
[PHYS.COND.CM-SCE]Physics [physics]/Condensed Matter [cond-mat]/Strongly Correlated Electrons [cond-mat.str-el]
- Language
- English
- ISSN
- 2643-1564
International audience; We study the dynamics of the quasi-one-dimensional Ising-Heisenberg antiferromagnet BaCo2V2O8 under a transverse magnetic field. Combining inelastic neutron scattering experiments and theoretical analyses by field theories and numerical simulations, we mainly elucidate the structure of the spin excitation spectrum in the high-field phase, appearing above the quantum phase transition point μ0Hc≈10T. We find that it is characterized by collective solitonic excitations superimposed on a continuum. These solitons are strongly bound in pairs due to the effective staggered field induced by the nondiagonal g tensor of the compound and are topologically different from the fractionalized spinons in the weak-field region. The dynamical susceptibility numerically calculated with the infinite time-evolving block decimation method shows an excellent agreement with the measured spectra, which enables us to identify the dispersion branches with elementary excitations. The lowest-energy dispersion has an incommensurate nature and has a local minimum at an irrational wave number due to the applied transverse field.