研究目的
Investigating the negative effective mass (density) metamaterials based on the electro-mechanical coupling exploiting plasma oscillations of a free electron gas.
研究成果
The study concludes that exploiting plasma oscillations of the electron gas relative to the ion lattice gives rise to the negative effective mass phenomenon. This effect is significant for the development of metamaterials with negative density, which have potential applications in acoustic tunneling, perfect power transmission through sharp corners, elastic power splitting, and seismic wave protection.
研究不足
The study is limited to theoretical and computational analysis without experimental validation. The effects of negative effective mass are observed only in the vicinity of the plasma frequency, which is very high for typical metals.
1：Experimental Design and Method Selection:
The study utilizes a mechanical model to demonstrate the negative effective mass effect, involving a core with mass m2 connected internally through a spring with constant k2 to a shell with mass m1, subjected to an external sinusoidal force.
2：Sample Selection and Data Sources:
Two conducting metals, Au and Li, are used as model systems.
3：List of Experimental Equipment and Materials:
The study involves metallic particles and electron gas within an ionic lattice.
4：Experimental Procedures and Operational Workflow:
The system is exposed to an external sinusoidal force, and the effective mass is calculated based on the plasma oscillations of the electron gas.
5：Data Analysis Methods:
The effective mass is analyzed in relation to the plasma frequency and the mass ratio of the electron gas to the ionic lattice.
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