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Negative Effective Mass in Plasmonic Systems
Version 1 : Received: 28 March 2020 / Approved: 29 March 2020 / Online: 29 March 2020 (03:39:01 CEST)
A peer-reviewed article of this Preprint also exists.
Bormashenko, E.; Legchenkova, I. Negative Effective Mass in Plasmonic Systems. Materials 2020, 13, 1890. Bormashenko, E.; Legchenkova, I. Negative Effective Mass in Plasmonic Systems. Materials 2020, 13, 1890.
We report the negative effective mass metamaterials based on the electro-mechanical coupling exploiting plasma oscillations of a free electron gas. The negative mass appears as a result of vibration of a metallic particle with a frequency of ω which is close the frequency of the plasma oscillations of the electron gas m_2 relatively to the ionic lattice m_1. The plasma oscillations are represented with the elastic spring k_2=ω_p^2 m_2, where ω_p is the plasma frequency. Thus, the metallic particle vibrated with the external frequency ω is described by the effective mass m_eff=m_1+(m_2 ω_p^2)/(ω_p^2-ω^2 ) , which is negative when the frequency ω approaches ω_p from above. The idea is exemplified with two conducting metals, namely Au and Li.
metamaterials; negative effective mass; plasma oscillations; low frequency plasmons
PHYSICAL SCIENCES, Condensed Matter Physics
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