## 抄録

We study the ground-state phase diagram of two-dimensional two-component (or pseudospin-12) Bose gases in mutually antiparallel synthetic magnetic fields in the space of the total filling factor and the ratio of the intercomponent coupling g↑↓ to the intracomponent coupling g>0. This time-reversal-invariant setting represents a bosonic analog of spin Hall systems. Using exact diagonalization, we find that (fractional) quantum spin Hall states composed of a pair of nearly independent quantum Hall states are remarkably robust and persist for g↑↓ up to as large as g. For g↑↓=-g, we find the exact many-body ground state in which particles in different spin states form pairs. This gives the exact critical line beyond which the system collapses in the thermodynamic limit.

本文言語 | English |
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論文番号 | 033602 |

ジャーナル | Physical Review A - Atomic, Molecular, and Optical Physics |

巻 | 90 |

号 | 3 |

DOI | |

出版ステータス | Published - 2014 9 2 |

外部発表 | はい |

## ASJC Scopus subject areas

- Atomic and Molecular Physics, and Optics