Energy gaps and roton structure above the [formula presented] laughlin state of a rotating dilute bose-einstein condensate

Tatsuya Nakajima, Masahito Ueda

Research output: Contribution to journalArticlepeer-review

Abstract

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 [Formula presented] Laughlin state without having a phonon branch despite the short-range nature of the interaction.

Original languageEnglish
JournalPhysical review letters
Volume91
Issue number14
DOIs
Publication statusPublished - 2003

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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