Geometry-diversified Coulomb excitations in trilayer AAB stacking graphene

Chiun Yan Lin, Bor Luen Huang, Ching Hong Ho, Godfrey Gumbs, Ming Fa Lin

研究成果: Article同行評審

15 引文 斯高帕斯(Scopus)


The lower-symmetry trilayer AAB-stacked graphene exhibits rich electronic properties and diverse Coulomb excitations. Three pairs of unusual valence and conduction bands create nine available interband excitations for the undoped case, in which the imaginary (real) part of the polarizability shows one-dimensional square root asymmetric peaks and two-dimensional shoulder structures (pairs of antisymmetric peaks and logarithm-type symmetric peaks). The low-frequency acoustic plasmon, being revealed as a prominent peak in the energy-loss spectrum, can survive in a narrow-gap system with the large density of states from the valence band. This type of plasmon mode is similar to that in a narrow-gap carbon nanotube. However, the decisive mechanism governing this plasmon is the intraband conduction state excitations. Its frequency, intensity and critical momentum exhibit a nonmonotonic dependence on the Fermi energy. The well-defined electron-hole excitation boundaries and the higher frequency optical plasmons are transformed by varying the Fermi energy. Many substantial differences between the electronic properties of AAB and other trilayer graphene stackings are discussed.

期刊Physical Review B
出版狀態Published - 2018 11月 28

All Science Journal Classification (ASJC) codes

  • 電子、光磁材料
  • 凝聚態物理學


深入研究「Geometry-diversified Coulomb excitations in trilayer AAB stacking graphene」主題。共同形成了獨特的指紋。