Thermodynamics of a quantum Ising system coupled to a spin bath

Article

关键词: TRANSVERSE FIELD;    MODEL;    DECOHERENCE;   

DOI  :  10.1103/PhysRevB.97.214430

来源: SCIE

【 摘 要 】

We study the effect of coupling a spin-bath environment to a system which, at low energies, can be modeled as a quantum Ising system. A field theoretic formalism incorporating both thermal and quantum fluctuations is developed to derive results for the thermodynamic properties and response functions, both for a toy model and for the LiHoF4 system, in which spin-8 electronic spins couple to a spin-7/2 nuclear spin bath: The phase transition then occurs in a system of electronuclear degrees of freedom, coupled by long-range dipolar interactions. The quantum Ising phase transition still exists, and one hybridized mode of the Ising and bath spins always goes soft at the transition.

【 授权许可】

Free