Semiclassical approximation with zero velocity trajectories

Details Semiclassical approximation with zero velocity trajectories Semiclassical approximation with zero velocity trajectories

2007-05-15

arxiv.org/abs/0705.2132v1

Physics

Quantum Physics

16 pages, 7 figures

Scientific paper

10.1016/j.chemphys.2007.05.014

We present a new semiclassical method that yields an approximation to the quantum mechanical wavefunction at a fixed, predetermined position. In the approach, a hierarchy of ODEs are solved along a trajectory with zero velocity. The new approximation is local, both literally and from a quantum mechanical point of view, in the sense that neighboring trajectories do not communicate with each other. The approach is readily extended to imaginary time propagation and is particularly useful for the calculation of quantities where only local information is required. We present two applications: the calculation of tunneling probabilities and the calculation of low energy eigenvalues. In both applications we obtain excellent agrement with the exact quantum mechanics, with a single trajectory propagation.

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