期刊
SOLID STATE COMMUNICATIONS
卷 334, 期 -, 页码 -出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ssc.2021.114398
关键词
Double layer; Bilayer graphene; Collective excitations; Temperature effects
资金
- Vietnam National University HoChiMinh City (VNU-HCM) [C2021-16-06]
This study investigates collective excitations in a double-layer graphene structure through numerical calculations, finding that temperature, doping density, and carrier density have significant effects on plasmon frequencies.
This paper aims to investigate collective excitations in a double-layer structure consisting of two parallel bilayer graphene sheets within random-phase-approximation. We determine the collective excitations in the system from the zeroes of the temperature-dependent dynamical dielectric function. Numerical results demonstrate that both optical in-phase and acoustic out-of-phase plasmon modes are found in the system, similar to other double-layer structures. Calculations prove that plasmon frequencies increase with the increase in temperature while the imbalance in doping density between two bilayer graphene sheets as well as the increase in carrier density decrease these frequencies. Similar to the case of zero temperature, increasing separation increases (decreases) acoustic (optical) plasmon frequency. Our computations illustrate that temperature affects remarkably and can reduce the effects of other factors on plasmon properties in double bilayer graphene systems.
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