Quasiballistic transport in the long-range anisotropic Heisenberg model

Article

关键词: QUANTUM;    PROPAGATION;    CHAIN;   

DOI  :  10.1103/PhysRevB.107.045134

来源: SCIE

【 摘 要 】

Purely ballistic transport is a rare feature even for integrable models. By numerically studying the Heisenberg chain with the power-law exchange, J proportional to 1/r(alpha), where r is a distance, we show that for spin anisotropy Delta similar or equal to exp(-alpha + 2) the system exhibits a quasiballistic spin transport and the presence of fermionic excitation, which do not decay up to extremely long times similar to 10(3)/J. This conclusion is reached on the basis of the dynamics of spin domains, the dynamical spin conductivity, inspection of the matrix elements of the spin-current operator, and analysis of most conserved operators. Our results smoothly connect two models in which fully ballistic transport is present: free particles with nearest-neighbor hopping and the isotropic Haldane-Shastry model.

【 授权许可】

Free