Breaking time-reversal symmetry in space-time modulated metamaterials always raises energy content and generates photon pairs from an initially empty state, except in pathological cases.
Fring, Journal of Physics: Conference Series 2448, 012002 (2023)
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Minimum energy and photon content in PT symmetric metamaterials
Breaking time-reversal symmetry in space-time modulated metamaterials always raises energy content and generates photon pairs from an initially empty state, except in pathological cases.