Properties of coherent matter-wave bubbles

Recently we have proposed a method to create thin matter-wave bubbles from coherent atoms trapped in a magnetic potential. In this article we discuss in detail some properties of these states. In particular, we numerically an d analytically investigate the Wigner function to demonstrate their non-cla ssical nature. Furthermore, we study the energy and lifetime of the bubbles , which are long-lived resonances in a radio frequency-induced adiabatic po tential, and illustrate how they can be transformed into excited eigenstate s of the original harmonic trapping potential.