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01746 am a22002413u 4500 |
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|a Liu, Zheng-Xin
|e author
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|a Massachusetts Institute of Technology. Department of Physics
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|a Wen, Xiao-Gang
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|a Gu, Zheng-Cheng
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|a Wen, Xiao-Gang
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|a Microscopic Realization of Two-Dimensional Bosonic Topological Insulators
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|b American Physical Society,
|c 2015-01-13T14:45:09Z.
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| 856 |
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|z Get fulltext
|u http://hdl.handle.net/1721.1/92814
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|a It is well known that a bosonic Mott insulator can be realized by condensing vortices of a boson condensate. Usually, a vortex becomes an antivortex (and vice versa) under time reversal symmetry, and the condensation of vortices results in a trivial Mott insulator. However, if each vortex or antivortex interacts with a spin trapped at its core, the time reversal transformation of the composite vortex operator will contain an extra minus sign. It turns out that such a composite vortex condensed state is a bosonic topological insulator (BTI) with gapless boundary excitations protected by U(1) ⋊ Z[T over 2] symmetry. We point out that in BTI, an external π-flux monodromy defect carries a Kramers doublet. We propose lattice model Hamiltonians to realize the BTI phase, which might be implemented in cold atom systems or spin-1 solid state systems.
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|a Perimeter Institute for Theoretical Physics
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|a National Science Foundation (U.S.) (Grant DMR-1005541)
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|a National Natural Science Foundation (China) (11274192)
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|a Templeton Foundation (Grant 39901)
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|a en
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|a Article
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|t Physical Review Letters
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