Quantum trajectories for resonant scattering

✍ Scribed by Kyungsun Na; Robert E. Wyatt

• Publisher: John Wiley and Sons
• Year: 2000
• Tongue: English
• Weight: 243 KB
• Volume: 81
• Category: Article
• ISSN: 0020-7608
• DOI: 10.1002/1097-461x(2001)81:3<206::aid-qua3>3.0.co;2-d

✦ Synopsis

Time-dependent wave packet resonant scattering for the double square barrier has been studied in terms of Bohm quantum trajectories. The high transmission probability for the wave packet with a resonant energy can be explained by the behavior of the quantum trajectories under the influence of the relatively slow formation of a node within the first barrier. This node splits the trajectories into reflected and transmitted components. During this stage, many particle trajectories pass through the double-barrier region and contribute to the transmitted part of the wave packet. Due to the transient nature of the nodes, trajectories in the reflected wave packet bunch together between the nodes for a finite period of time so that temporary structure (localization of particles and accompanying increase in the probability density) develops on small length scales. These calculations also show that the particles gain high momentum near the nodal points, and they reach a uniform momentum distribution after transmitting the barrier region. We have found that the presence of a node between the two barriers influences the different lifetimes of the quasi-bound states.