Phys. Rev. Lett. 91, 140401 (2003) [4 pages]Energy Gaps and Roton Structure above the ν=1/2 Laughlin State of a Rotating Dilute Bose-Einstein CondensateReceived 11 March 2003; published 30 September 2003 Exact diagonalization study of a rotating dilute Bose-Einstein condensate reveals that as the first vortex enters the system the degeneracy of the low-energy yrast spectrum is lifted and a large energy gap emerges. As more vortices enter with faster rotation, the energy gap decreases towards zero, but eventually the spectrum exhibits a rotonlike structure above the ν=1/2 Laughlin state without having a phonon branch despite the short-range nature of the interaction. © 2003 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.91.140401
DOI:
10.1103/PhysRevLett.91.140401
PACS:
03.75.Kk, 05.30.Jp, 67.40.Db
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