Quantum coherence in a four-level atomic system can produce left-handed material properties with negative permittivity and permeability across a broader frequency range under specific conditions.
¨O.Oktel, ¨O.E.Mvstecapliouglu, Phys
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Left handness in a four-level atomic system
Quantum coherence in a four-level atomic system can produce left-handed material properties with negative permittivity and permeability across a broader frequency range under specific conditions.