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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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資料種別: 学術論文

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PhysRevB.96.085104(1).pdf (出版社版), 2MB
ファイルのパーマリンク:
https://hdl.handle.net/11858/00-001M-0000-002E-3682-0
ファイル名:
PhysRevB.96.085104(1).pdf
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-
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公開
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application/pdf / [MD5]
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著作権日付:
2017
著作権情報:
© American Physical Society

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 作成者:
Coulthard, J. R.1, 著者
Clark, S. R.2, 3, 著者
Al-Assam, S.1, 著者
Cavalleri, A.1, 2, 著者           
Jaksch, D.1, 4, 著者
所属:
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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 要旨: 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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言語: eng - English
 日付: 2017-08-01
 出版の状態: 出版
 ページ: -
 出版情報: -
 目次: -
 査読: 査読あり
 学位: -

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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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出版物 1

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出版物名: Physical Review B
  出版物の別名 : Phys. Rev. B
種別: 学術雑誌
 著者・編者:
所属:
出版社, 出版地: American Physical Society
ページ: - 巻号: 96 (8) 通巻号: - 開始・終了ページ: 085104 識別子(ISBN, ISSN, DOIなど): -