中国物理B ›› 2018, Vol. 27 ›› Issue (7): 77502-077502.doi: 10.1088/1674-1056/27/7/077502

• CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES • 上一篇    下一篇

Asymmetric response of magnetic impurity in Bernal-stacked bilayer honeycomb lattice

Jin-Hua Sun(孙金华), Ho-Kin Tang(邓皓键)   

  1. 1 Department of Physics, Ningbo University, Ningbo 315211, China;
    2 Department of Physics, Faculty of Science, National University of Singapore, Singapore 117542, Singapore
  • 收稿日期:2018-04-03 修回日期:2018-04-19 出版日期:2018-07-05 发布日期:2018-07-05
  • 通讯作者: Jin-Hua Sun E-mail:sunjinhua@nbu.edu.cn
  • 基金资助:

    Project supported by the National Natural Science Foundation of China (Grant No. 11604166), the Zhejiang Open Foundation of the Most Important Subjects, China (Grant No. xkzw11609), and the K. C. Wong Magna Fund in Ningbo University, China.

Asymmetric response of magnetic impurity in Bernal-stacked bilayer honeycomb lattice

Jin-Hua Sun(孙金华)1, Ho-Kin Tang(邓皓键)2   

  1. 1 Department of Physics, Ningbo University, Ningbo 315211, China;
    2 Department of Physics, Faculty of Science, National University of Singapore, Singapore 117542, Singapore
  • Received:2018-04-03 Revised:2018-04-19 Online:2018-07-05 Published:2018-07-05
  • Contact: Jin-Hua Sun E-mail:sunjinhua@nbu.edu.cn
  • Supported by:

    Project supported by the National Natural Science Foundation of China (Grant No. 11604166), the Zhejiang Open Foundation of the Most Important Subjects, China (Grant No. xkzw11609), and the K. C. Wong Magna Fund in Ningbo University, China.

摘要:

We utilize the Hirsch-Fye quantum Monte Carlo method to investigate the local moment formation of a magnetic impurity in a Bernal-stacked bilayer honeycomb lattice. A tight-binding model with the two most significant inter-layer hoppings, t1 between pairs of dimer sites and t3 between pairs of non-dimer sites, is used to describe the kinetic energy of the system. The local moment formed shows an asymmetric response to the inter-layer hoppings depending on which sublattice the impurity is coupled to. In the dimer and non-dimer couplings, the effects of t1 and t3 onto the local moment are quite opposite. When tuning the local moment, this asymmetric response is observed in a wide parameter range. This asymmetric response is also discussed by the computations of spectral densities, as well as correlation functions between the magnetic impurity and the conduction electrons.

关键词: local moments, bilayer honeycomb lattices, quantum Monte Carlo

Abstract:

We utilize the Hirsch-Fye quantum Monte Carlo method to investigate the local moment formation of a magnetic impurity in a Bernal-stacked bilayer honeycomb lattice. A tight-binding model with the two most significant inter-layer hoppings, t1 between pairs of dimer sites and t3 between pairs of non-dimer sites, is used to describe the kinetic energy of the system. The local moment formed shows an asymmetric response to the inter-layer hoppings depending on which sublattice the impurity is coupled to. In the dimer and non-dimer couplings, the effects of t1 and t3 onto the local moment are quite opposite. When tuning the local moment, this asymmetric response is observed in a wide parameter range. This asymmetric response is also discussed by the computations of spectral densities, as well as correlation functions between the magnetic impurity and the conduction electrons.

Key words: local moments, bilayer honeycomb lattices, quantum Monte Carlo

中图分类号:  (Magnetic impurity interactions)

  • 75.30.Hx
75.20.Hr (Local moment in compounds and alloys; Kondo effect, valence fluctuations, heavy fermions) 73.90.+f (Other topics in electronic structure and electrical properties of surfaces, interfaces, thin films, and low-dimensional structures) 71.27.+a (Strongly correlated electron systems; heavy fermions)