Abstract
We show that a free quantum particle in two dimensions with zero angular momentum ( wave) in the form of a ring-shaped wave packet feels an attraction towards the center of the ring, leading first to a contraction followed by an expansion. An experiment to demonstrate this effect is also outlined.
- Received 17 October 2001
DOI:https://doi.org/10.1103/PhysRevLett.89.060404
©2002 American Physical Society