论文标题
在外在纳米线约瑟夫森连接处的高阶多重多重Andreev反射的光子辅助隧道
Photon assisted tunneling of high order multiple Andreev reflections in epitaxial nanowire Josephson junctions
论文作者
论文摘要
半导体/超导体杂种表现出一系列现象，可以利用这些现象，用于研究新技术和新技术的发展。因此，了解此类杂种的能量谱是一个至关重要的目标。在这里，我们研究了由InASSB/Al Nanowires上的阴影外延定义的约瑟夫森连接。这些设备在低温和有限电压偏置处的多个Andreev反射（MARS）显示出栅极可调的超电流。在微波辐照下，火星的光子辅助隧道（PAT）在量化的能量处产生特征性的振荡边带，该量子依赖于MAR Order $ n $，与最近建议对经典Tien-Gordon方程进行修改一致。具有微波频率的量化能量间距的缩放提供了对$ n^\ mathrm {th} $订购隧道过程传递的有效费用$ ne $的独立确认。测量结果表明，PAT是一种有力的方法，用于分配混合Josephson设备中低能光谱特征的起源。
Semiconductor/superconductor hybrids exhibit a range of phenomena that can be exploited for the study of novel physics and the development of new technologies. Understanding the origin the energy spectrum of such hybrids is therefore a crucial goal. Here, we study Josephson junctions defined by shadow epitaxy on InAsSb/Al nanowires. The devices exhibit gate-tunable supercurrents at low temperatures and multiple Andreev reflections (MARs) at finite voltage bias. Under microwave irradiation, photon assisted tunneling (PAT) of MARs produces characteristic oscillating sidebands at quantized energies, which depend on MAR order, $n$, in agreement with a recently suggested modification of the classical Tien-Gordon equation. The scaling of the quantized energy spacings with microwave frequency provides independent confirmation of the effective charge $ne$ transferred by the $n^\mathrm{th}$ order tunnel process. The measurements suggest PAT as a powerful method for assigning the origin of low energy spectral features in hybrid Josephson devices.
