Energy dynamics in a generalized compass chain. (17th October 2016)

• Record Type: Journal Article
• Authors: Qiu, Yu-Cheng; Wu, Qing-Qiu; You, Wen-Long
• Is Part Of: Journal of physics. Volume 28:Number 49(2016)
• Publication Date: 2016-10-17
• Subjects: energy dynamics -- generalized compass model -- three-site interactions; Condensed matter -- Periodicals; Matière condensée -- Périodiques; Vaste stoffen; Vloeistoffen; Natuurkunde; Electronic journals; Computer network resources; 530.4105
• DOI: 10.1088/0953-8984/28/49/496001
• Languages: English
• ISSNs: 0953-8984

Abstract

Abstract: We investigate the energy dynamics in a generalized compass chain under an external magnetic field. We show that the energy current operators act on three contiguous sites in the absence of the magnetic field, and they are incorporated with inhomogenous Dzyaloshinskii-Moriya interactions in the presence of the magnetic field. Under these complex interactions the Hamiltonian remains an exactly solvable spin model. We study the effects of the three-site interactions and the Dzyaloshinskii–Moriya interactions on the energy spectra and phase diagram. The results have revealed that the energy current of the pristine quantum compass model is conserved due to the associated intermediate symmetries, and for other general cases such a characteristic does not exist.