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Exact diagonalization study of a rotating dilute Bose-Einstein condensatereveals that as the first vortex enters the system the degeneracy of thelow-energy yrast spectrum is lifted and a large energy gap emerges. As morevortices enter with faster rotation, the energy gap decreases towards zero, buteventually the spectrum exhibits a rotonlike structure above the nu=1/2Laughlin state without having a phonon branch despite the short-range nature ofthe interaction.Comment: 4 pages, 4 figures, 1 tabl

physical review letters

Energy Gaps and Roton Structure above the<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>ν</mml:mi><mml:mo>=</mml:mo><mml:mn>1</mml:mn><mml:mo>/</mml:mo><mml:mn>2</mml:mn></mml:math>Laughlin State of a Rotating Dilute Bose-Einstein Condensate

Energy Gaps and Roton Structure above theν=1/2Laughlin State of a Rotating Dilute Bose-Einstein Condensate