Journal
PHYSICAL REVIEW A
Volume 90, Issue 3, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevA.90.033602
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Funding
- Japan Society for the Promotion of Science [22103005, 26287088, 22340114]
- Photon Frontier Network Program from MEXT of Japan
- KAKENHI [22103005]
- Grants-in-Aid for Scientific Research [22103005, 25800225, 26287088] Funding Source: KAKEN
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We study the ground-state phase diagram of two-dimensional two-component (or pseudospin-1/2) Bose gases in mutually antiparallel synthetic magnetic fields in the space of the total filling factor and the ratio of the intercomponent coupling g up down arrow 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 down arrow up to as large as g. For g up down arrow = -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.
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