Stabilizing quantum metastable states in a time-periodic potential - Quantum PhysicsReport as inadecuate




Stabilizing quantum metastable states in a time-periodic potential - Quantum Physics - Download this document for free, or read online. Document in PDF available to download.

Abstract: In this talk we present a model to demonstrate how time-periodic potentialcan be used to manipulate quantum metastability of a system. We studymetastability of a particle trapped in a well with a time-periodicallyoscillating barrier in the Floquet formalism. It is shown that the oscillatingbarrier causes the system to decay faster in general. However, avoidedcrossings of metastable states can occur with the less stable states crossingover to the more stable ones. If in the static well there exists a bound state,then it is possible to stabilize a metastable state by adiabatically increasingthe oscillating frequency of the barrier so that the unstable state eventuallycross-over to the stable bound state. It is also found that increasing theamplitude of the oscillating field may change a direct crossing of states intoan avoided one. Hence, one can manipulate the stability of different states ina quantum potential by a combination of adiabatic changes of the frequency andthe amplitude of the oscillating barrier.



Author: Choon-Lin Ho, Chung-Chieh Lee

Source: https://arxiv.org/







Related documents