Phase transitions and adiabatic preparation of a fractional Chern insulator in a boson cold-atom model

Article

关键词: MATRIX RENORMALIZATION-GROUP;    PERIODICALLY DRIVEN;    QUANTUM-SYSTEMS;    ELECTRONS;    LIMIT;   

DOI  :  10.1103/PhysRevB.96.165107

来源: SCIE

【 摘 要 】

We investigate the fate of hardcore bosons in a Harper-Hofstadter model which was experimentally realized by Aidelsburger et al. [Nat. Phys. 11, 162 (2015)] at half-filling of the lowest band. We discuss the stability of an emergent fractional Chern insulator (FCI) state in a finite region of the phase diagram that is separated from a superfluid state by a first-order transition when tuning the band topology following the protocol used in the experiment. Since crossing a first-order transition is unfavorable for adiabatically preparing the FCI state, we extend the model to stabilize a featureless insulating state. The transition between this phase and the topological state proves to be continuous, providing a path in parameter space along which an FCI state could be adiabatically prepared. To further corroborate this statement, we perform time-dependent DMRG calculations which demonstrate that the FCI state may indeed be reached by adiabatically tuning a simple product state.

【 授权许可】

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