期刊
SOLID STATE COMMUNICATIONS
卷 298, 期 -, 页码 -出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ssc.2019.113647
关键词
-
资金
- Vietnam National Foundation for Science and Technology Development (NAFOSTED) [103.01-2017.23]
We calculate the plasmon frequency and broadening function in a system consisting of N, up to 5, bilayer graphene sheets at zero temperature. We find that there are one in-phase optical mode and N-1 out-of-phase acoustic ones in plasmon dispersions of the system. With increasing N, the energy of optical and upper-lying acoustical modes increase, while that of the low-lying acoustical branches decreases slightly. For N = 4 and 5, the uppermost acoustical plasmon curve crosses the single-layer plasmon one at some value of momentum outside the electron-hole continuum. In density unbalance systems with N = 3 and 4, the plasmon modes depend remarkably on density values of each layers. This behavior is different from that of graphene multilayer structures.
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