Quantum phases in $p$-orbital degenerated attractive 1D fermionic optical lattices

Keita Kobayashi; Yukihiro Ota; Masahiko Okumura; Susumu Yamada; Masahiko Machida

doi:10.1103/physreva.89.023625

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arXiv · 1401.0241

Quantum phases in $p$-orbital degenerated attractive 1D fermionic optical lattices

Keita Kobayashi·Yukihiro Ota·Masahiko Okumura·Susumu Yamada·Masahiko Machida

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Abstract

We examine quantum phases emerged by double degeneracy of $p$-orbital bands in attractive atomic Fermi gases loaded on a 1D optical lattice. Our numerical simulations by the density-matrix renormalization group predict the emergence of a state with a charge excitation gap, the Haldane insulator phase. A mapping onto an effective spin-$1$ model reveals its physical origin. Moreover, we show that population imbalance leads to richer diversity of the quantum phases, including a phase-separated polarized state. Finally, we study the effects of harmonic trap potential in this 1D chain.

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Keita Kobayashi, Yukihiro Ota, Masahiko Okumura, Susumu Yamada, Masahiko Machida. 2014-02-07. Quantum phases in $p$-orbital degenerated attractive 1D fermionic optical lattices. https://doi.org/10.1103/physreva.89.023625

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