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Redistribution of phase fluctuations in a periodically driven cuprate superconductor

MPS-Authors
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Cavalleri,  Andrea
Quantum Condensed Matter Dynamics, Condensed Matter Dynamics Department, Max Planck Institute for the Structure and Dynamics of Matter, Max Planck Society;
Department of Physics, Oxford University, Clarendon Laboratory;

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PhysRevB.91.104507.pdf
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Citation

Höppner, R., Zhu, B., Rexin, T., Cavalleri, A., & Mathey, L. (2015). Redistribution of phase fluctuations in a periodically driven cuprate superconductor. Physical Review B, 91(10): 104507. doi:10.1103/PhysRevB.91.104507.


Cite as: http://hdl.handle.net/11858/00-001M-0000-0025-776B-3
Abstract
We study the thermally fluctuating state of a bilayer cuprate superconductor under the periodic action of a staggered field oscillating at optical frequencies. This analysis distills essential elements of the recently discovered phenomenon of light-enhanced coherence in YBa2Cu3O6+x, which was achieved by periodically driving infrared active apical oxygen distortions. The effect of a staggered periodic perturbation is studied using a Langevin and Fokker-Planck description of driven, coupled Josephson junctions, which represent two neighboring pairs of layers and their two plasmons. In a toy model including only two junctions, we demonstrate that the external driving leads to a suppression of phase fluctuations of the low-energy plasmon, an effect which is amplified via the resonance of the high-energy plasmon. When extending the modeling to the full layers, we find that this reduction becomes far more pronounced, with a striking suppression of the low-energy fluctuations, as visible in the power spectrum. We also find that this effect acts on the in-plane fluctuations, which are reduced on long length scales. All these findings provide a physical framework to describe light control in cuprates.