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Enhancement of superexchange pairing in the periodically driven Hubbard model

MPS-Authors

Clark,  S. R.
Quantum Condensed Matter Dynamics, Condensed Matter Dynamics Department, Max Planck Institute for the Structure and Dynamics of Matter, Max Planck Society;
Department of Physics, University of Bath, Claverton Down, Bath BA2 7AY, United Kingdom;

/persons/resource/persons133811

Cavalleri,  A.
Quantum Condensed Matter Dynamics, Condensed Matter Dynamics Department, Max Planck Institute for the Structure and Dynamics of Matter, Max Planck Society;
Clarendon Laboratory, University of Oxford, Parks Road, Oxford OX1 3PU, United Kingdom;

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PhysRevB.96.085104(1).pdf
(Publisher version), 2MB

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Citation

Coulthard, J. R., Clark, S. R., Al-Assam, S., Cavalleri, A., & Jaksch, D. (2017). Enhancement of superexchange pairing in the periodically driven Hubbard model. Physical Review B, 96(8), 085104. Retrieved from https://link.aps.org/doi/10.1103/PhysRevB.96.085104.


Cite as: http://hdl.handle.net/11858/00-001M-0000-002E-3680-3
Abstract
Recent experiments performed on cuprates and alkali-doped fullerides have demonstrated that key signatures of superconductivity can be induced above the equilibrium critical temperature by optical modulation. These observations in disparate physical systems may indicate a general underlying mechanism. Multiple theories have been proposed, but these either consider specific features, such as competing instabilities, or focus on conventional BCS-type superconductivity. Here we show that periodic driving can enhance electron pairing in strongly correlated systems. Focusing on the strongly repulsive limit of the doped Hubbard model, we investigate in-gap, spatially inhomogeneous, on-site modulations. We demonstrate that such modulations substantially reduce electronic hopping, while simultaneously sustaining superexchange interactions and pair hopping via driving-induced virtual charge excitations. We calculate real-time dynamics for the one-dimensional case, starting from zero- and finite-temperature initial states, and we show that enhanced singlet-pair correlations emerge quickly and robustly in the out-of-equilibrium many-body state. Our results reveal a fundamental pairing mechanism that might underpin optically induced superconductivity in some strongly correlated quantum materials.