TY - JOUR
T1 - Global phase diagram of two-component Bose gases in antiparallel magnetic fields
AU - Furukawa, Shunsuke
AU - Ueda, Masahito
N1 - Publisher Copyright:
© 2014 American Physical Society.
PY - 2014/9/2
Y1 - 2014/9/2
N2 - 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.
AB - 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.
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U2 - 10.1103/PhysRevA.90.033602
DO - 10.1103/PhysRevA.90.033602
M3 - Article
AN - SCOPUS:84911073088
SN - 1050-2947
VL - 90
JO - Physical Review A - Atomic, Molecular, and Optical Physics
JF - Physical Review A - Atomic, Molecular, and Optical Physics
IS - 3
M1 - 033602
ER -