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.
Enhancement of Local Pairing Correlations in Periodically Driven Mott Insulators
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abstract
We investigate a model for a Mott insulator in presence of a time-periodic modulated interaction and a coupling to a thermal reservoir. The combination of drive and dissipation leads to non-equilibrium steady states with a large number of doublon excitations, well above the maximum thermal-equilibrium value. We interpret this effect as an enhancement of local pairing correlations, providing analytical arguments based on a Floquet Hamiltonian. Remarkably, this Hamiltonian shows a tendency to develop long-range staggered superconducting correlations. This suggests the possibility of realizing the elusive eta-pairing phase in driven-dissipative Mott Insulators.
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cond-mat.str-el 1years
2019 1verdicts
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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.