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