Composite spin liquid in a correlated topological insulator: Spin liquid without spin-charge separation

摘要

In this paper, we present an alternative type of insulator, namely composite spin liquid, which can be regarded as a short-range B-type topological spin-density wave as proposed by J. He et al. [Phys. Rev. B 84, 035127 (2011)]. Composite spin liquid is a topological ordered state beyond the classification of traditional spin liquid states. The elementary excitations are the "composite electrons" with both spin and charge degrees of freedom, together with topological spin texture. This topological state supports the chiral edge mode but no topological degeneracy.