集体激发介导的具有量子限域效应的纳米约瑟夫森结中的输运
Collective excitation-mediated transport in nanoscale Josephson junctions that exhibit quantum confinement
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中文总结 AI 辅助
本研究揭示纳米约瑟夫森结中集体激发模式增强准粒子输运，其能量受量子限域调制，可间接探测超导态。
中文摘要 AI 辅助
量子限域可以强烈改变约瑟夫森结中的输运。在这里，我们研究了库仑阻塞区中纳米约瑟夫森结堆栈的局域隧穿输运，其中金属层表现出强烈的垂直量子限域。我们发现，准粒子输运被一种集体激发模式强烈增强，该模式是结本身固有的，并局域在孤立的金属覆盖层中。我们量化了集体模式能量和库仑间隙，并表明两者都表现出强烈的层依赖调制，与底层量子阱态的调制一致。我们进一步研究了集体激发对各种扰动的响应，包括机械运动和施加的磁场。我们的结果表明，这种集体模式对费米能级附近的准粒子敏感，因此可能为超导态提供间接探针。
英文摘要
Quantum confinement can strongly modify transport through Josephson junctions. Here, we study local tunneling transport through nanoscale Josephson junction stacks in the Coulomb blockade regime, where the metallic layers exhibit strong vertical quantum confinement. We find that quasiparticle transport is strongly enhanced by a collective excitation mode intrinsic to the junction and localized in the isolated metallic overlayer. We quantify both the collective-mode energy and the Coulomb gap and show that both exhibit strong layer-dependent modulation, consistent with the modulation of the underlying quantum well states. We further investigate how the collective excitation responds to various perturbations, including mechanical motion and an applied magnetic field. Our results suggest that this collective mode is sensitive to quasiparticles near the Fermi level and may therefore provide an indirect probe of the superconducting state.
发表机构
- Radboud University（拉德堡德大学）
- Freie Universität Berlin（柏林自由大学）
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