Equilibrium dynamics of the XX chain

Article

关键词: TEMPERATURE CORRELATION-FUNCTIONS;    HIDDEN GRASSMANN STRUCTURE;    SPIN-1/2 HEISENBERG CHAIN;    DENSITY-MATRIX;    ISING CHAIN;    XY-MODEL;    EQUATIONS;   

DOI  :  10.1103/PhysRevB.100.155428

来源: SCIE

【 摘 要 】

The equilibrium dynamics of the spin-1/2 XX chain is reexamined within a recently developed formalism based on the quantum transfer matrix and a thermal form-factor expansion. The transversal correlation function is evaluated in real time and space. The high-accuracy calculation reproduces several exact results in limiting cases as well as the well-known asymptotic formulas obtained by the matrix Riemann-Hilbert approach. Furthermore, comparisons to numerical data based on a direct evaluation of the Pfaffian as well as to asymptotic formulas obtained within nonlinear Luttinger liquid theory are presented.

【 授权许可】

Free