title: Quantum coherence and quantum phase transitions.
abstract: We study the connections between local quantum coherence (LQC) based on Wigner-Yanase skew information and quantum phase transitions (QPTs). When applied on the one-dimensional Hubbard, XY spin chain with three-spin interaction, and Su-Schrieffer-Heeger models, the LQC and its derivatives are used successfully to detect different types of QPTs in these spin and fermionic systems. Furthermore, the LQC is effective as the quantum discord (QD) in detecting QPTs at finite temperatures, where the entanglement has lost its effectiveness. We also demonstrate that the LQC can exhibit different behaviors in many forms compared with the QD.
authors.affiliation: College of Materials Science and Opto-Electronic Technology, University of Chinese Academy of Sciences, Beijing 100049, People's Republic of China.
authors.forename: Yan-Chao
authors.initials: YC
authors.lastname: Li
authors.affiliation: Beijing Computational Science Research Center, Beijing 100193, People's Republic of China.
authors.forename: Hai-Qing
authors.initials: HQ
authors.lastname: Lin