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.
Shen, Phys.Lett.A 357,(2006)54
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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.