High precision determination of the low-energy constants for the two-dimensional quantum Heisenberg model on the honeycomb lattice |
| |
Authors: | Email author" target="_blank">FJ?JiangEmail author |
| |
Institution: | 1.Department of Physics,National Taiwan Normal University,Taipei, Taiwan,China |
| |
Abstract: | The low-energy constants, namely the staggered magnetization density M? s per spin, the spin stiffness ρ s , and the spinwave velocity c of the two-dimensional (2-d) spin-1/2 Heisenberg model on the honeycomb lattice are calculated using first principles Monte Carlo method. The spinwave velocity c is determined first through the winding numbers squared. M? s and ρ s are then obtained by employing the relevant volume- and temperature-dependence predictions from magnon chiral perturbation theory. The periodic boundary conditions (PBCs) implemented in our simulations lead to a honeycomb lattice covering both a rectangular and a parallelogram-shaped region. Remarkably, by appropriately utilizing the predictions of magnon chiral perturbation theory, the numerical values of M? s , ρ s , and c we obtain for both the considered periodic honeycomb lattice of different geometries are consistent with each other quantitatively. The numerical accuracy reached here is greatly improved. Specifically, by simulating the 2-d quantum Heisenberg model on the periodic honeycomb lattice overlaying a rectangular area, we arrive at M? s = 0.26882(3), ρ s = 0.1012(2)J, and c = 1.2905(8)Ja. The results we obtain provide a useful lesson for some studies such as simulating fermion actions on hyperdiamond lattice and investigating second order phase transitions with twisted boundary conditions. |
| |
Keywords: | |
本文献已被 SpringerLink 等数据库收录! |
|