Semiclassical approach to spin dynamics of a ferromagnetic S=1 chain

Abstract

Motivated by recent experimental progress in the quasi-one-dimensional quantum magnet NiNb${}_2$O${}_6$, we study the spin dynamics of an S=1 ferromagnetic Heisenberg chain with single-ion anisotropy by using a semiclassical molecular dynamics approach. This system undergoes a quantum phase transition from a ferromagnetic to a paramagnetic state under a transverse magnetic field, and the magnetic responses reflecting this transition is well described by our semiclassical method. We show that at low-temperature the transverse component of the dynamical structure factor depicts clearly the magnon dispersion, and the longitudinal component exhibits two continua associated with single- and two-magnon excitations, respectively. These spin excitation spectra show interesting temperature dependence as effects of magnon interactions.Our findings shed light on experimental detection of spin excitations in a large class of quasi-one-dimensional magnets.

References in corpus (14)

• Quantum criticality in an Ising chain: experimental evidence for emergent E8 symmetry
• Experimental Observation of Bethe Strings
• Evolution of Quantum Fluctuations Near the Quantum Critical Point of the Transverse Field Ising Chain System CoNb${}_2$O${}_6$
• Topological quantum phase transition in the Ising-like antiferromagnetic spin chain BaCo${}_2$V${}_2$O${}_8$
• Deconfined quantum critical point in one dimension
• Interplay of Quantum Criticality and Geometric Frustration in Columbite
• Quantum criticality of the Ising-like screw chain antiferromagnet SrCo2V2O8 in a transverse magnetic field
• $E_8$ Spectra of Quasi-one-dimensional Antiferromagnet BaCo${}_2$V${}_2$O${}_8$ under Transverse Field
• Duality and domain wall dynamics in a twisted Kitaev chain
• Glide symmetry breaking and Ising criticality in the quasi-1D magnet CoNb${}_2$O${}_6$
• Probing magnon dynamics and interactions in a ferromagnetic spin-1 chain
• Multimagnon dynamics and thermalization in the $S=1$ easy-axis ferromagnetic chain
• Magnetic ground-state of the one-dimensional ferromagnetic chain compounds $M$(NCS)${}_2$(thiourea)${}_2$; $M$ = Ni, Co
• Dynamical signatures of the one-dimensional deconfined quantum critical point

Cited by in corpus (1)

• Emergent quasi-particles of spin-1 trimer chain