title: Second renormalization of tensor-network states.
abstract: We propose a second renormalization group method to handle the tensor-network states or models. This method dramatically reduces the truncation error of the tensor renormalization group. It allows physical quantities of classical tensor-network models or tensor-network ground states of quantum systems to be accurately and efficiently determined.
authors.affiliation: Institute of Theoretical Physics, Chinese Academy of Sciences, P.O. Box 2735, Beijing 100190, China.
authors.forename: Z Y
authors.initials: ZY
authors.lastname: Xie
authors.forename: H C
authors.initials: HC
authors.lastname: Jiang
authors.forename: Q N
authors.initials: QN
authors.lastname: Chen
authors.forename: Z Y
authors.initials: ZY
authors.lastname: Weng
authors.forename: T
authors.initials: T
authors.lastname: Xiang