Photodoping a repulsive Hubbard Mott insulator can stabilize a metastable eta-pairing superconducting phase, detectable through a zero-frequency conductivity peak and negative high-frequency conductivity.
Basov , author R
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$\eta$--paired superconducting hidden phase in photodoped Mott insulators
Photodoping a repulsive Hubbard Mott insulator can stabilize a metastable eta-pairing superconducting phase, detectable through a zero-frequency conductivity peak and negative high-frequency conductivity.