%0 Journal Article %J Phys. Rev. B %D 2016 %T Mapping a Fractional Quantum Hall State to a Fractional Chern Insulator %A Yinhan Zhang %A Junren Shi %X We establish a variational principle for properly mapping a fractional quantum Hall state to a fractional Chern insulator (FCI). We find that the mapping has a gauge freedom which could generate a class of FCI ground-state wave functions appropriate for different forms of interactions. Therefore, the gauge should be fixed by a variational principle that minimizes the interaction energy of the FCI model. For a soft and isotropic electron-electron interaction, the principle leads to a gauge coinciding with that for maximally localized two-dimensional projected Wannier functions of a Landau level. %B Phys. Rev. B %V 93 %P 165129 %G eng %] 000374537600003 %R 10.1103/PhysRevB.93.165129