Multiply quantized vortices in trapped Bose-Einstein condensates are studied
using the Bogoliubov theory. Suitable combinations of a localized pinning
potential and external rotation of the system are found to energetically
stabilize, both locally and globally, vortices with multiple circulation
quanta. We present a phase diagram for stable multiply quantized vortices in
terms of the angular rotation frequency and the width of the pinning potential.
We argue that multiquantum vortices could be experimentally created using these
two expedients.Comment: 5 pages, 4 figure