Proposed Parametric Cooling of Bilayer Cuprate Superconductors by Terahertz Excitation
Proposed Parametric Cooling of Bilayer Cuprate Superconductors by Terahertz Excitation
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DOI：
10.1103/physrevlett.114.137001
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发表时间：
2015-03-31
影响因子：
8.6
通讯作者：
Jaksch, D.
中科院分区：
文献类型：
--
作者：
Denny, S. J.;Clark, S. R.;Jaksch, D.
我们提出并分析了一种基于c轴振动模式选择性驱动的双层铜氧化物参数冷却方案。该方案利用振动作为换能器，使约瑟夫森等离子体频率的时间依赖性。我们展示了如何调制在不同的频率之间的intrabilayer和interbilayer等离子体激元基本上抑制interbilayer相位波动，负责切换c轴运输从超导到电阻状态。我们的计算表明，这可能提供了一个可行的机制，稳定非平衡超导性，甚至高于Tc，提供了一个有限的对密度之间的双层之间的平衡。
We propose and analyze a scheme for parametrically cooling bilayer cuprates based on the selective driving of a c-axis vibrational mode. The scheme exploits the vibration as a transducer making the Josephson plasma frequencies time dependent. We show how modulation at the difference frequency between the intrabilayer and interbilayer plasmon substantially suppresses interbilayer phase fluctuations, responsible for switching c-axis transport from a superconducting to a resistive state. Our calculations indicate that this may provide a viable mechanism for stabilizing nonequilibrium superconductivity even above T-c, provided a finite pair density survives between the bilayers out of equilibrium.