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Journal Article

Theory of Enhanced Interlayer Tunneling in Optically Driven High-Tc Superconductors


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, Clarendon Laboratory, University of Oxford;

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Okamoto, J.-i., Cavalleri, A., & Mathey, L. (2016). Theory of Enhanced Interlayer Tunneling in Optically Driven High-Tc Superconductors. Physical Review Letters, 117(22): 227001. doi:10.1103/PhysRevLett.117.227001.

Cite as: https://hdl.handle.net/11858/00-001M-0000-002A-FD42-D
Motivated by recent pump-probe experiments indicating enhanced coherent c-axis transport in underdoped YBCO, we study Josephson junctions periodically driven by optical pulses. We propose a mechanism for this observation by demonstrating that a parametrically driven Josephson junction shows an enhanced imaginary part of the low-frequency conductivity when the driving frequency is above the plasma frequency, implying an effectively enhanced Josephson coupling. We generalize this analysis to a bilayer system of Josephson junctions modeling YBCO. Again, the Josephson coupling is enhanced when the pump frequency is blue detuned to either of the two plasma frequencies of the material. We show that the emergent driven state is a genuine, nonequilibrium superconducting state, in which equilibrium relations between the Josephson coupling, current fluctuations, and the critical current no longer hold.