title: Finite-temperature scaling of trace distance discord near criticality in spin diamond structure.
abstract: In this work we explore the quantum correlation quantified by trace distance discord as a measure to analyze the quantum critical behaviors in the Ising-XXZ diamond structure at finite temperatures. It is found that the first-order derivative of the trace distance discord exhibits a maximum around the critical point at finite temperatures. By analyzing the finite-temperature scaling behavior, we show that such a quantum correlation can detect exactly the quantum phase transitions from the entan-gled state in ferrimagnetic phase to an unentangled state in ferrimagnetic phase or to an unentangled state in ferromagnetic phase. The results also indicate that the above two kinds of transitions can be distinguished by the different finite-temperature scaling behaviors. Moreover, we find that the trace distance discord, in contrast to other typical quantum correlations (e.g., concurrence, quantum discord and Hellinger distance), may be more reliable to exactly spotlight the critical points of this model at finite temperatures under certain situations.
authors.affiliation: Institute of Signal Processing &Transmission, Nanjing University of Posts and Telecommunication, Nanjing, 210003, China.
authors.forename: W W
authors.initials: WW
authors.lastname: Cheng
authors.affiliation: Institute of Signal Processing &Transmission, Nanjing University of Posts and Telecommunication, Nanjing, 210003, China.
authors.forename: X Y
authors.initials: XY
authors.lastname: Wang
authors.affiliation: Institute of Signal Processing &Transmission, Nanjing University of Posts and Telecommunication, Nanjing, 210003, China.
authors.forename: Y B
authors.initials: YB
authors.lastname: Sheng
authors.affiliation: Institute of Signal Processing &Transmission, Nanjing University of Posts and Telecommunication, Nanjing, 210003, China.|National Laboratory of Solid State Microstructures &Innovation Center of Advanced Microstructures, Nanjing University, Nanjing, 210093, China.
authors.forename: L Y
authors.initials: LY
authors.lastname: Gong
authors.affiliation: Institute of Signal Processing &Transmission, Nanjing University of Posts and Telecommunication, Nanjing, 210003, China.
authors.forename: S M
authors.initials: SM
authors.lastname: Zhao
authors.affiliation: National Laboratory of Solid State Microstructures &Innovation Center of Advanced Microstructures, Nanjing University, Nanjing, 210093, China.
authors.forename: J M
authors.initials: JM
authors.lastname: Liu