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  Enhancement of superexchange pairing in the periodically driven Hubbard model

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. doi:10.1103/PhysRevB.96.085104.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-002E-3680-3 Version Permalink: http://hdl.handle.net/11858/00-001M-0000-002E-3681-1
Genre: Journal Article

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PhysRevB.96.085104(1).pdf (Publisher version), 2MB
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https://doi.org/10.1103/PhysRevB.96.085104 (Publisher version)
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 Creators:
Coulthard, J. R.1, Author
Clark, S. R.2, 3, Author
Al-Assam, S.1, Author
Cavalleri, A.1, 2, Author              
Jaksch, D.1, 4, Author
Affiliations:
1Clarendon Laboratory, University of Oxford, Parks Road, Oxford OX1 3PU, United Kingdom, ou_persistent22              
2Quantum Condensed Matter Dynamics, Condensed Matter Dynamics Department, Max Planck Institute for the Structure and Dynamics of Matter, Max Planck Society, ou_1938293              
3Department of Physics, University of Bath, Claverton Down, Bath BA2 7AY, United Kingdom, ou_persistent22              
4Centre for Quantum Technologies, National University of Singapore, 3 Science Drive 2, Singapore , ou_persistent22              

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 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.

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Language(s): eng - English
 Dates: 2017-08-01
 Publication Status: Published in print
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 Rev. Method: Peer
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Project name : This research is funded by the European Research Council under the European Union's Seventh Framework Programme (FP7/2007–2013)/ERC Grant Agreement No. 319286 Q-MAC. S.A. and D.J. acknowledge support from the EPSRC Tensor Network Theory grant (EP/K038311/1).
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Title: Physical Review B
  Alternative Title : Phys. Rev. B
Source Genre: Journal
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Publ. Info: American Physical Society
Pages: - Volume / Issue: 96 (8) Sequence Number: - Start / End Page: 085104 Identifier: -