Coulomb excitations of monolayer germanene

Po Hsin Shih, Yu Huang Chiu, Jhao Ying Wu, Feng Lin Shyu, Ming Fa Lin

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Abstract

The feature-rich electronic excitations of monolayer germanene lie in the significant spin-orbit coupling and the buckled structure. The collective and single-particle excitations are diversified by the magnitude and direction of transferred momentum, the Fermi energy and the gate voltage. There are four kinds of plasmon modes, according to the unique frequency-and momentum-dependent phase diagrams. They behave as two-dimensional acoustic modes at long wavelength. However, for the larger momenta, they might change into another kind of undamped plasmons, become the seriously suppressed modes in the heavy intraband e-h excitations, keep the same undamped plasmons, or decline and then vanish in the strong interband e-h excitations. Germanene, silicene and graphene are quite different from one another in the main features of the diverse plasmon modes.

Original languageEnglish
Article number40600
JournalScientific reports
Volume7
DOIs
Publication statusPublished - 2017 Jan 16

All Science Journal Classification (ASJC) codes

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    Shih, P. H., Chiu, Y. H., Wu, J. Y., Shyu, F. L., & Lin, M. F. (2017). Coulomb excitations of monolayer germanene. Scientific reports, 7, [40600]. https://doi.org/10.1038/srep40600