Rotational properties of two-component Bose gases in the lowest Landau level

Abstract

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 {\it 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 $M\ge N$), 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 $\Lambda$-level kinetic energy. Diagonalization within this significally 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.

References in corpus (3)

• Quantum Hall physics in rotating Bose-Einstein condensates
• Quantum Hall States in Rapidly Rotating Two-Component Bose Gases
• Non-Abelian spin singlet states of two-component Bose gases in artificial gauge fields

Cited by in corpus (1)

• Fractional angular momentum in cold atom systems