期刊
PHYSICS LETTERS A
卷 382, 期 32, 页码 2133-2136出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.physleta.2018.05.034
关键词
Surface plasmon; Dirac plasma; Quantum hydrodynamic model
资金
- UGC-SAP (DRS, Phase III) [F.510/3/DRS-III/2015(SAPI)]
- UGC-MRP [43-539/2014 (SR), 3668]
The collective excitation of surface plasmons in a massless Dirac plasma (e.g., graphene) half-space (bounded by air) is investigated using a relativistic quantum fluid model. The unique features of such surface waves are discussed and compared with those in a Fermi plasma. It is found that in contrast to Fermi plasmas, the long-wavelength surface plasmon frequency (omega) in massless Dirac plasmas is explicitly nonclassical, i.e., omega proportional to 1 root h, where h = 2 pi(h) over bar is the Planck's constant. Besides some apparent similarities between the surface plasmon frequencies in massless Dirac plasmas and Fermi plasmas, several notable differences are also found and discussed. Our findings elucidate the properties of surface plasmons that may propagate in degenerate plasmas where the relativistic and quantum effects play a vital role. (C) 2018 Elsevier B.V. All rights reserved.
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