Bi-directional ultrafast electric-field gating of interlayer charge transport in a cuprate superconductor
Bi-directional ultrafast electric-field gating of interlayer charge transport in a cuprate superconductor
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DOI：
10.1038/nphoton.2011.124
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发表时间：
2011-08-01
期刊：
影响因子：
35
通讯作者：
Cavalleri, A.
中科院分区：
文献类型：
--
作者：
Dienst, A.;Hoffmann, M. C.;Cavalleri, A.
在铜超导体中，平面之间的隧道使得三维超导传输成为可能。然而，当平面间建立阶参数相位梯度时，层间隧穿幅度减小。因此，如果沿c轴施加强电场，则可以减弱沿c轴的层间超导性。在这篇论文中，我们使用高场单周期太赫兹脉冲来门控La1.84Sr0.16CuO4的层间耦合。我们在超导态和电阻态之间诱导超快振荡，并在不降低库珀对密度的情况下打开和关闭等离子体响应。平面内超导性保持不受干扰，显示出一种非平衡状态，其中超导性的维度与时间有关。门控频率由电场强度决定。超导的非耗散、双向门控对超快纳米电子学中的器件应用很感兴趣，并代表了非线性太赫兹物理如何使纳米等离子体和活性超材料受益的一个例子。
In cuprate superconductors, tunnelling between planes makes three-dimensional superconductive transport possible. However, the interlayer tunnelling amplitude is reduced when an order-parameter-phase gradient between planes is established. As such, interlayer superconductivity along the c-axis can be weakened if a strong electric field is applied along the c-axis. In this Letter, we use high-field single-cycle terahertz pulses to gate interlayer coupling in La1.84Sr0.16CuO4. We induce ultrafast oscillations between superconducting and resistive states and switch the plasmon response on and off, without reducing the density of Cooper pairs. In-plane superconductivity remains unperturbed, revealing a non-equilibrium state in which the dimensionality of the superconductivity is time-dependent. The gating frequency is determined by the electric field strength. Non-dissipative, bi-directional gating of superconductivity is of interest for device applications in ultrafast nanoelectronics and represents an example of how nonlinear terahertz physics can benefit nanoplasmonics and active metamaterials.