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Dynamical polarization in a graphene-topological-insulator Heterostructure

Journal Article


Abstract


  • The frequency, chemical potential, hopping energy and temperature dependence of polarization in a graphene-topological-insulator heterostructure is investigated. The polarization is found to be sensitive to the graphene-topological-insulator hopping energy and chemical potential. Compared to hopping energy and chemical potential, temperature has a relatively small effect on the polarization which only slightly changes the peak value. The unique band structures of graphene-topologicalinsulator heterostructures give rise to dual polarization peaks. Furthermore, the position of the polarization peak that originates from the graphene bands is robust while the position of the other peak can be tuned by varying the hopping energy and chemical potential. From the polarization function two branches of plasma dispersion are observed due to the coupling of graphene and the surface states of topological insulators.

Authors


  •   Zuber, Jack (external author)
  •   Huang, Sunchao (external author)
  •   Tian, Jie (external author)
  •   Chao Zhang

Publication Date


  • 2019

Citation


  • Zuber, J., Huang, S., Tian, J. & Zhang, C. (2019). Dynamical polarization in a graphene-topological-insulator Heterostructure. Materials Research Express, 6 (4), 045603-1-045603-7.

Scopus Eid


  • 2-s2.0-85062044842

Start Page


  • 045603-1

End Page


  • 045603-7

Volume


  • 6

Issue


  • 4

Place Of Publication


  • United Kingdom

Abstract


  • The frequency, chemical potential, hopping energy and temperature dependence of polarization in a graphene-topological-insulator heterostructure is investigated. The polarization is found to be sensitive to the graphene-topological-insulator hopping energy and chemical potential. Compared to hopping energy and chemical potential, temperature has a relatively small effect on the polarization which only slightly changes the peak value. The unique band structures of graphene-topologicalinsulator heterostructures give rise to dual polarization peaks. Furthermore, the position of the polarization peak that originates from the graphene bands is robust while the position of the other peak can be tuned by varying the hopping energy and chemical potential. From the polarization function two branches of plasma dispersion are observed due to the coupling of graphene and the surface states of topological insulators.

Authors


  •   Zuber, Jack (external author)
  •   Huang, Sunchao (external author)
  •   Tian, Jie (external author)
  •   Chao Zhang

Publication Date


  • 2019

Citation


  • Zuber, J., Huang, S., Tian, J. & Zhang, C. (2019). Dynamical polarization in a graphene-topological-insulator Heterostructure. Materials Research Express, 6 (4), 045603-1-045603-7.

Scopus Eid


  • 2-s2.0-85062044842

Start Page


  • 045603-1

End Page


  • 045603-7

Volume


  • 6

Issue


  • 4

Place Of Publication


  • United Kingdom