Theory of Enhanced Interlayer Tunneling in Optically Driven High-T_{c} Superconductors.

@article{Okamoto2016TheoryOE,
  title={Theory of Enhanced Interlayer Tunneling in Optically Driven High-T\_\{c\} Superconductors.},
  author={Junichi Okamoto and Andrea Cavalleri and Ludwig Mathey},
  journal={Physical review letters},
  year={2016},
  volume={117 22},
  pages={
          227001
        }
}
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… 

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References

SHOWING 1-10 OF 26 REFERENCES
Enhancement of superconductivity via periodic modulation in a three-dimensional model of cuprates
Recent experiments in the cuprates have seen evidence of a transient superconducting state upon optical excitation polarized along the c-axis [R. Mankowsky et al., Nature 516, 71 (2014)]. Motivated
Josephson Plasma Resonances and Optical Properties in High-Tc Superconductors with Alternating Junction Parameters.
We investigate the phase dynamics in an intrinsic Josephson-junction array with alternating junction parameters, taking account of both capacitive and inductive couplings between junctions. The
I-V characteristics of Josephson-coupled layered superconductors with longitudinal plasma excitations.
Coupled equations for the interlayer phase differences in Josephson-coupled layered superconductors are derived in both current-biased and voltage-biased cases. These equations have a solution
Proposed parametric cooling of bilayer cuprate superconductors by terahertz excitation.
TLDR
Modulation at the difference frequency between the intrabilayer and interbilayer plasmon substantially suppresses interbilayers phase fluctuations, responsible for switching c-axis transport from a superconducting to a resistive state.
Optically induced coherent transport far above Tc in underdoped YBa2Cu3O6+δ
We report on a photo-induced transient state of YBa2Cu2O6+x in which transport perpendicular to the Cu-O planes becomes highly coherent. This effect is achieved by excitation with mid-infrared
Light-Induced Superconductivity in a Stripe-Ordered Cuprate
TLDR
Mid-infrared femtosecond pulses are used to enable coherent transport between the copper oxide planes of a cuprate superconductor, and an upper limit for the time scale needed to form the superconducting phase is estimated to be 1 to 2 picoseconds, which places stringent new constraints on the understanding of stripe order and its relation to superconductivity.
Transverse optical plasmons in layered superconductors
We discuss the possible existance of transverse optical plasma modes in superlattices consisting of Josephson coupled superconducting layers. These modes appear as resonances in the current-current
Redistribution of phase fluctuations in a periodically driven cuprate superconductor
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
Parametric Amplification of a Superconducting Plasma Wave
TLDR
Terahertz JPWs can be parametrically amplified through the cubic tunneling nonlinearity in a cuprate superconductor to achieve squeezing of the order parameter phase fluctuations in single terahertz-photon devices.
Light-induced enhancement of superconductivity via melting of competing bond-density wave order in underdoped cuprates
We develop a theory for light-induced superconductivity in underdoped cuprates in which the competing bond-density wave order is suppressed by driving phonons with light. Close to a bond-density wave
...
...