Tuesday, July 16, 2013

1307.3786 (Ray Ng et al.)

Simulation of the Dynamics of Many-Body Quantum Spin Systems Using
Phase-Space Techniques

Ray Ng, Piotr Deuar, Erik Sorensen
We reformulate the full quantum dynamics of spin systems using a phase space representation based on SU(2) coherent states which generates an exact mapping of the dynamics of any spin system onto a set of stochastic differential equations. The new representation is superior in practice to an earlier phase space approach based on Schwinger bosons, with the numerical effort scaling only linearly with system size. By also implementing extrapolation techniques from quasiclassical equations to the full quantum limit, we are able to extend useful simulation times several fold. This approach is applicable in any dimension including cases where frustration is present in the spin system. The method is demonstrated by simulating quenches in the transverse field Ising model in one and two dimensions
View original: http://arxiv.org/abs/1307.3786

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