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Rotational properties of two-component Bose gases in the lowest Landau level
KTH, Centres, Nordic Institute for Theoretical Physics NORDITA.
2014 (English)In: Physical Review A. Atomic, Molecular, and Optical Physics, ISSN 1050-2947, E-ISSN 1094-1622, Vol. 89, no 4, 043625- p.Article in journal (Refereed) Published
Abstract [en]

We study the rotational (yrast) spectra of dilute two-component atomic Bose gases in the low angular momentum regime, assuming equal interspecies and intraspecies interaction. Our analysis employs the composite fermion (CF) approach including a pseudospin degree of freedom. While the CF approach is not a priori expected to work well in this angular momentum regime, we show that composite fermion diagonalization gives remarkably accurate approximations to low-energy states in the spectra. For angular momenta 0 < L < M ( where N and M denote the numbers of particles of the two species, and M >= N), we find that the CF states span the full Hilbert space and provide a convenient set of basis states which, by construction, are eigenstates of the symmetries of the Hamiltonian. Within this CF basis, we identify a subset of the basis states with the lowest A-level kinetic energy. Diagonalization within this significantly smaller subspace constitutes a major computational simplification and provides very close approximations to ground states and a number of low-lying states within each pseudospin and angular momentum channel.

Place, publisher, year, edition, pages
2014. Vol. 89, no 4, 043625- p.
Keyword [en]
Atomic Bose gas, Close approximation, Composite fermion, Degree of freedom, Diagonalizations, Low-energy state, Low-lying state, Two-component, Kinetics
National Category
Physical Sciences
URN: urn:nbn:se:kth:diva-146564DOI: 10.1103/PhysRevA.89.043625ISI: 000335788800016ScopusID: 2-s2.0-84899754927OAI: diva2:724391

QC 20140612

Available from: 2014-06-12 Created: 2014-06-12 Last updated: 2014-06-12Bibliographically approved

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Sreejith, Ganesh Jaya
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Nordic Institute for Theoretical Physics NORDITA
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