• 文献标题:   Quantum dissonance in chiral graphene nanoribbons
  • 文献类型:   Article
  • 作  者:   TAN XD, KANG XB, ZHAO LM, ZHANG JJ, HAO HS
  • 作者关键词:   chiral graphene nanoribbon, quantum dissonance, wannier edge state
  • 出版物名称:   JOURNAL OF PHYSICSCONDENSED MATTER
  • ISSN:   0953-8984 EI 1361-648X
  • 通讯作者地址:   Henan Inst Engn
  • 被引频次:   0
  • DOI:   10.1088/1361-648X/ab071c
  • 出版年:   2019

▎ 摘  要

Based on the effective spin-ladder model, we study the properties of quantum dissonance (Q) between two edge spins in chiral graphene nanoribbons (CGNRs) thermalized with a reservoir at temperature T, and discuss the influences of relative location between two edge spins, ribbon width, temperature, and on-site Coulomb repulsion (U) on Q. The results show that Q is widely present in Wannier edge states. For intra-edge coupled spin pairs, quantum entanglement (E) is zero, but there still exists considerable value of Q. Interestingly, Q always keeps a constant for entangled edge spin pairs. Considering the thermal effect, it shows that Q always decays with the increasing temperature T, and the decay rate is very sensitive to the intensity of U. Compared Q with E and total quantum correlation (quantum discord, denoted by D), we conjecture that the quantum correlations for a bipartite Wannier edge state in CGNRs satisfy the relation Q