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

Theory of Enhanced Interlayer Tunneling in Optically Driven High-T_{c} Superconductors.
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光驱动高温_{c}超导体增强层间隧道理论

DOI:
10.1103/physrevlett.117.227001
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发表时间:
2016
影响因子:
8.6
通讯作者:
L. Mathey
L. Mathey
中科院分区:
物理与天体物理1区
文献类型:
--
作者:
Junichi Okamoto;A. Cavalleri;L. Mathey

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Motivated by recent pump-probe experiments indicating enhanced coherent-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.
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