Eduard Ilin, Xiangyu Song, Irina Burkova, Andrew Silge, Ziang Guo, Konstantin Ilin, Alexey Bezryadin
We report superconducting kinetic inductance memory (SKIM) element, which can be controlled exclusively by the bias supercurrent, without involving magnetic fields and heating elements. The SKIM is non-volatile memory. The device is made of Nb and it can operate reliable up to 2.8 K. The achieved error rate is as low as one in 100000 operations.
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Nonlinear Properties of Supercurrent-Carrying Single and Multi-Layer Thin-Film Superconductors
本文基于广义Usadel方程分析超流体薄膜的非线性特性，研究了超流体对密度态、临界电流、阻抗等参数的影响，为优化探测器和放大器设计提供理论支持。
Magnetic field dependence of kinetic inductance in Bi2Sr2Ca2Cu3O10 superconducting strip and its feasible applications
本文研究了BSCCO-2223化合物超导薄样品的动力学电感特性。在低温超导状态下，动力学电感随外加磁场的变化有很强的相关性。薄超导体的动电感随磁场的增加而线性增加。这种行为被用于设计超导调制器电路。这一特性对超导功率放大器、超导发射机、超导交流电流控制器等超导电子电路的设计和器件应用具有重要意义。
Superconducting single-electron transistor and the phi-modulation of supercurrent
本文导出了超导单电子晶体管（SSET）超导电流的解析表达式。推导是基于EJ>E C的模型哈密顿量与离散一维谐振子（1DDHO）之间的类比。由此产生的超电流是几乎相同的超电流从一个连续的谐振子哈密顿量。
We present exact numerical calculations of supercurrent density, inductance, and impurity-induced flux noise of cylindrical superconducting wires in the nonlocal Pippard regime, which occurs when the Pippard coherence length is larger than the London penetration depth. In this regime the supercurrent density displays a peak away from the surface, and changes sign inside the superconductor, signalling a breakdown of the usual approximation of local London electrodynamics with a renormalized penetration depth. Our calculations show that the internal inductance and the bulk flux noise power is en…
A simple method has been developed for manufacturing a thin film superconducting quantum interferometer (SQI) with ultralow inductance (~10^-13 H). Current-voltage and voltage-field characteristics of the SQI are presented. The basic design equations are obtained and confirmed experimentally. The SQI has been used for the first time to determine the penetration depth of a magnetic field into a film of 50% In-50% Sn alloy.
The patterns of reversible changes in the critical current and discrete current states of a structure in the form of a superconducting quantum interferometer shunted by superconducting inductance, as a result of passing an alternating transport current through the structure and applying an external alternating magnetic field simultaneously with a direct transport current, was established. A new type of discrete stationary state was discovered during the transition of the interferometer to the resistive state caused by the combined action of direct and alternating transport currents.
Comment on "Vortices induced in a superconducting loop by asymmetric kinetic inductance and their detection in transport measurements"
G. R. Berdiyorov，M. V. Milosevic和F. M. Peeters [Phys.Rev.B81，144511（2010）]从理论上研究了超导回路的动态特性。作者认为他们对非对称环的考虑与我们在这一领域的实验结果有关。我们指出这种说法是不正确的，并简要地解释了我们对非对称超导环的测量结果的真正矛盾本质。
Inductances and attenuation constant for a thin-film superconducting coplanar waveguide resonator
对由载流中心导体、相邻缝隙和接地层组成的薄膜超导共面波导谐振器的几何电感、动力电感、总电感和衰减常数进行了理论分析。分析集中在膜的厚度$d$服从$d < 2λ$（$λ$是伦敦渗透深度），其材料特性的特点是由二维屏蔽长度$Λ= 2 λ^2/d$。引入一个截止程序，保证在中心导体和接地层的电流的大小是相等的，新的和更简单的结果获得的动态电感和衰减常数小$Λ$。精确的结果为任意$Λ$的几何，动力学和总电感的限制微小的槽宽，和近似的结果为任意槽宽。
We investigate thin films of conducting aluminium-oxide, also known as granular aluminium, as a material for superconducting high quality, high kinetic inductance circuits. The films are deposited by an optimised reactive DC magnetron sputter process and characterised using microwave measurement techniques at milli-Kelvin temperatures. We show that, by precise control of the reactive sputter conditions, a high room temperature sheet resistance and therefore high kinetic inductance at low temperatures can be obtained. For a coplanar waveguide resonator with 1.5\,k$Ω$ sheet resistance and a kine…
Perfect Superconducting Diode and Supercurrent Range Controller
本研究提出基于多纳米线超导量子干涉器件的完美超导二极管模型，实现100%二极管效率且抗磁场微扰，同时发现该器件可在宽条件下作为可调窄范围超流控制器，助力超导计算机研发。
The demand for low-dissipation nanoscale memory devices is as strong as ever. As Moore's Law is staggering, and the demand for a low-power-consuming supercomputer is high, the goal of making information processing circuits out of superconductors is one of the central goals of modern technology and physics. So far, digital superconducting circuits could not demonstrate their immense potential. One important reason for this is that a dense superconducting memory technology is not yet available. Miniaturization of traditional superconducting quantum interference devices is difficult below a few m…
We present a single-electron device for the manipulation of charge states via quantum interference in nanostructured electrodes. Via self-inductance effects, we induce two independent magnetic fluxes in the electrodes and we demonstrate sensitivity to single charge states and magnetic field at variable temperature. Moreover, our approach allows us to demonstrate local and independent control of the single-particle conductance between nano-engineered tunnel junctions in a fully-Superconducting Quantum Interference Single-Electron Transistor (SQUISET), thereby increasing the flexibility of our s…
Frequency-tunable Superconducting Resonators via Nonlinear Kinetic Inductance
我们设计、制作并测试了一种由铌钛氮化物薄膜制成的频率可调谐高Q超导谐振器。频率可调谐性是通过将直流电流通过电流引导电路注入到非线性电感器中来实现的，该非线性电感器的动态电感是电流相关的。我们已经证明了连续调谐的谐振频率在180 MHz的频率范围内约4.5 GHz，同时保持高的内部品质因数$Q_i> 180,000$。该器件可作为一个可调谐滤波器，并在超导量子计算和测量中找到应用。它也为研究超导体的非线性响应提供了有用的工具。此外，它还可以发展成测量超导体在其转变温度下的复阻抗和读出转变边缘传感器的技术。
In this work, we study the current phase relation ($CΦR$) of lithographically fabricated molybdenum germanium (MoGe) nanobridges, which is intimately linked to the nanobridge kinetic inductance. We do this by imbedding the nanobridges in a SQUID. We observe that for temperatures far below $T_c$, the $CΦR$ is linear as long as the condensate is not weakened by the presence of supercurrent. We demonstrate lithographic control over the nanobridge kinetic inductance, which scales with the nanobridge aspect ratio. This allows to tune the SQUID $I_c(B)$ characteristic. The SQUID properties that can …
Transport Properties of Vortex Matter Governed by the Edge Inductance of Superconducting Bi$_{2}$Sr$_{2}$CaCu$_{2}$O$_{8}$ Single Crystals
本文研究了超导Bi $_2$ Sr $_2$ CaCu $_2$ O $_8$晶体中的输运电流分布以及通过样品边缘的涡流。我们表明，$T_x$过渡是电动力学，而不是热力学性质，低于该涡旋动力学是由边缘电感，而不是电阻。这允许测量低至传输噪声两个数量级的电阻。通过照射电流接触的电阻阶跃在涡流熔化示出是由于c轴相关性的损失，而不是准长程序内的a-b平面的故障。
Effect of charge-imbalance potential relaxation on the high-frequency vortex dynamics and kinetic inductance of superconducting circuits
研究电荷不平衡势弛豫对超导电路高频涡旋动力学及动电感的影响，从含时金兹堡 - 朗道方程推导涡旋运动方程，揭示其在临界温度附近的延迟效应及对超导电路特性的作用。
Investigations into the microwave surface impedance of superconducting resonators have led to the development of single photon counters that rely on kinetic inductance for their operation. While concurrent progress in additive manufacturing, `3D printing', opens up a previously inaccessible design space for waveguide resonators. In this manuscript, we present results from the first synthesis of these two technologies in a titanium, aluminum, vanadium (Ti-6Al-4V) superconducting radio frequency resonator which exploits a design unattainable through conventional fabrication means. We find that T…
Surface superconductivity in multilayered rhombohedral graphene: Supercurrent
计算了平带多层菱面体石墨烯表面超导电性的超电流。尽管没有激发光谱的色散，超电流是有限的。临界电流与零温超导能隙成正比，即，超导临界温度和动量空间中平带的大小。
Effect of Thermal Phase Fluctuations on the Inductances of Josephson Junctions, Arrays of Junctions, and Superconducting Films
我们计算的因素，热相位波动，不同于相位滑移波动，增加电感，LJ，连续分流约瑟夫森结（JJ）以上的平均场值，L0。我们发现，量子力学抑制波动时，T下降到低于一个温度，TQ = h/kBGL 0，其中G是分流电导。对JJ阵列的计算薄层电感LA（T）/L0（T）的检查表明，2-D互连将波动效应减半，同时以更大的因子减少相位滑移效应。在这些结果的指导下，我们计算了二维薄膜的薄层电感，LF（T）/L0（T），通过处理每个等离子体振荡模式作为一个过阻尼JJ。在无序s波超导体中，当LF（0）/LF（T）> 0.14（或T/TC 0 < 0.94）时，量子抑制是重要的。在最佳掺杂的YBCO和BSCCO中，量子抑制对于l2（0）/l2（T）> 0.25是重要的，其中l是穿透深度。
Microwave kinetic inductance detectors (MKIDs) are thin film, cryogenic, superconducting resonators. Incident Cooper pair-breaking radiation increases their kinetic inductance, thereby measurably lowering their resonant frequency. For a given resonant frequency, the highest MKID responsivity is obtained by maximizing the kinetic inductance fraction $α$. However, in circuits with $α$ close to unity, the low supercurrent density reduces the maximum number of readout photons before bifurcation due to self-Kerr non-linearity, therefore setting a bound for the maximum $α$ before the noise equivalen…
Current-Phase Relation and Josephson Inductance of Superconducting Cooper Pair Transistor
本文研究了超导库珀对晶体管（SCPT）的约瑟夫森电感$L_J$。我们跟踪的电感使用微波反射测量的调谐谐振电路中，SCPT安装在平行的$ \sim 200$ pH带状线电感。当逆的约瑟夫森电感，确定的电荷相位偏置平面上的SCPT的约瑟夫森库仑能量比为$E_J/E_C =1.75$，是集成的相位，我们得到的电流相位关系，这是强烈的非正弦附近的电荷简并点。
Supercurrent as a bulk probe for topological phase
本文提出基于超电流响应的体探针方法，研究一维Rashba自旋轨道耦合超导纳米线，发现拓扑相内超电流被抑制2倍，可通过动能电感测量探测体拓扑相转变。
Supercurrent Distribution in Real-Space and Anomalous Paramagnetic Response in a Superconducting Quasicrystal
本文通过Bogoliubov-de Gennes平均场理论研究了Ammann-Beenker准周期结构中实空间超流分布，发现抗磁电流局部违反守恒定律需顺磁电流补偿，且顺磁电流表现出与外加矢量势垂直或反向的反常行为。
We have solved numerically the diffusive Usadel equations that describe the spatially-varying superconducting proximity effect in Ti-Al thin-film bi- and trilayers with thickness values that are suitable for Kinetic Inductance Detectors (KIDs) to operate as photon detectors with detection thresholds in the frequency range of 50-90 GHz. Using Nam's extension of the Mattis-Bardeen calculation of the superconductor complex conductivity, we show how to calculate the surface impedance for the spatially varying case, and hence the surface impedance quality factor. In addition, we calculate energy-an…
Supercurrent in superconducting graphene
重新讨论了超导石墨烯中的超电流问题，并在平均场模型中采用蜂窝晶格上的两分量波函数计算了超导石墨烯中的超电流，其中蜂窝晶格中的布里渊区中的不同谷之间存在配对。我们表明，在线性近似的有序参数相梯度的超电流总是有限的，即使掺杂水平是零。
Higgs mode in superconductors, i.e. the collective amplitude mode of the order parameter does not associate with charge nor spin fluctuations, therefore it does not couple to the electromagnetic field in the linear response regime. On the contrary to this common understanding, here, we demonstrate that, if the dc supercurrent is introduced into the superconductor, the Higgs mode becomes infrared active and is directly observed in the linear optical conductivity measurement. We observed a sharp resonant peak at $ω=2Δ$ in the optical conductivity spectrum of a thin-film NbN in the presence of dc…
We address, using concepts of the microscopic theory of superconductivity, parametric amplifiers and kinetic inductance detectors focusing on the interaction of microwave radiation with the superconducting condensate. This interaction was identified recently as the source of the apparent dissipation in microwave superconducting micro-resonators at low temperatures. Since the evaluation of the performance of practical devices based only on the microwave-response is not sufficiently informative about the underlying physical processes, we propose an experimental system to measure the microscopica…
Supercurrent diode with high winding vortex
研究通过涡旋相位纹理调控超流整流并检测非常规涡旋状态
Superconducting non-volatile memory based on charge trapping and gate-controlled supercurrent
本文提出了一种基于电荷捕获和门控超电流的非易失性超导存储器，利用两种独立效应实现二进制信息存储，并展示了其非易失性和高可靠性。
Kinetic inductance of superconducting nanostrips with turns
基于伦敦模型和复电流方法，理论研究了含转弯超导纳米带的动力学电感，发现其电流分布与正常导电纳米带等效，并分析了边缘缺陷的影响。
Giant nonlinearity of kinetic inductance in superconducting hybrid strip
该研究在NbN/Al混合超导条带中实现动生电感50倍巨变化，源于邻近效应与参数选择使电流-动量关系出现平台，为高灵敏电磁探测器等器件开辟新途径。
Role of kinetic inductance in transport properties of shunted superconducting nanowires
近年来，人们对超导长纳米线的输运特性进行了研究[M. W. Brenner { \it et. al.}，B { \bf{85} }，224507（2012）]。测量的电压-电流（$V$ - $I$）特性被解释为相位滑移中心的出现在分流线，整个线被建模为一个单一的约瑟夫森结。实验中使用的长纳米线的动力学电感通常很大。在这里，我们认为，分流超导纳米线作为一个约瑟夫森结串联电感器。电感取决于导线的长度和截面。在我们的分析中包含电感修改了$V$ - $I$曲线，并增加了从超导状态到电阻状态的切换速率。在一些实际的参数设置中，定量差异可能相当大，并且对于正确理解实验结果可能很重要。通过对不同长度和截面的超导纳米线的研究，我们提出的模型得到了实验验证。
Experimental Study of the Inductance of Pinned Vortices in Superconducting YBa2Cu3O7-d Films
用双线圈互感法测量了在垂直于薄膜方向施加磁场Be的情况下，脉冲激光沉积YBa_2Cu_3 O_（7-d）薄膜中钉扎涡旋的复电阻率ρ_v（T，Be）。在低频率（<100 kHz）下，rho_v是感性的，与Labusch参数、平均涡旋钉扎力常数kappa_exp成反比。观察到的削弱kappa_exp与Be是一个简单的模型的基础上线性钉扎缺陷是一致的。在模型中加入经典的热涨落，可以简单地描述rho_v在~15 K以下与温度的线性关系，并给出了缺陷的有效半径（0.3 nm ~> 0.8 nm）和钉扎势深度的合理值。这个模型的成功意味着热超导（相位）波动有其完整的经典振幅下降到5 K的频率低于特征脱钉频率。到目前为止，还没有足够的理论来解释~15 K和涡旋玻璃熔化温度之间的数据。
High Fidelity Qubit Readout with the Superconducting Low-Inductance Undulatory Galvanometer Microwave Amplifier
描述了基于超导低电感波动电流计（SLUG）的微波放大器对超导量子比特的高保真色散测量。与最先进的HEMT放大器相比，SLUG放大器的增益达到19 dB，信噪比提高9 dB。我们证明了在700 ns的分离保真度为99%相比，59%的HEMT单独。SLUG显示了大的动态范围，输入饱和功率对应于读出腔中的700个光子。
Magnetically memorable inductance in superconducting multilayer resonators
研究超导多层谐振器中的磁记忆电感，通过制造基于特定多层的裂环谐振器并微波表征，利用钴层磁化方向反转实现谐振频率非易失性变化，证明其可作为超导电路的现场可编程电感元件。
Supercurrent and Conductance Quantization in a Superconducting Quantum Point Contact
研究了分裂栅超导体-二维电子-超导体（S-2DEG-S）约瑟夫森结中超导量子点接触（SQPC）的超导电流和电导的量子化.超电流和电导值作为栅极电压的函数逐步变化。我们观察到的第一个运输模式的发病都有助于超导和电导的SQPC。此外，超导和电导中的阶跃出现在相同的栅极电压值处。这表明，SQPC中的每种输运模式都对正常态电导和超电流都有贡献。
Mutual Inductance Sensing SQUID: Cryogenic microcalorimeter based on mutual inductance readout of superconducting temperature sensors
提出基于互感读出的新型SQUID微 calorimeter，利用超导体接近临界温度时磁渗透深度的强温度依赖性，实现高能分辨率的X射线光谱检测。
Boron-doped diamond granular thin films are known to exhibit superconductivity with an optimal critical temperature of Tc = 7.2K. Here we report the measured complex surface impedance of Boron-doped diamond films in the microwave frequency range using a resonant technique. Experimentally measured inductance values are in good agreement with estimates obtained from the normal state sheet resistance of the material. The magnetic penetration depth temperature dependence is consistent with that of a fully-gapped s-wave superconductor. Boron-doped diamond films should find application where high ki…
Giant second-harmonic generation (SHG) in the terahertz (THz) frequency range is observed in a thin film of an s-wave superconductor NbN, where the time-reversal ($\mathcal{T}$-) and space-inversion ($\mathcal{P}$-) symmetries are simultaneously broken by supercurrent injection. We demonstrate that the phase of the second-harmonic (SH) signal flips when the direction of supercurrent is inverted, i.e., the signal is ascribed to the nonreciprocal response that occurs under broken $\mathcal{P}$- and $\mathcal{T}$-symmetries. The temperature dependence of the SH signal exhibits a sharp resonance, …
We investigate superconducting phase transition in superconductor(S)/ferromagnet(F) bilayer with Rasba spin-orbit interaction at S/F interface. This spin-orbit coupling produces spontaneous supercurrents flowing inside the atomic-thickness region near the interface, which are compensated by the screening Meissner currents [S. Mironov and A. Buzdin, Phys. Rev. Lett \textbf{118}, 077001 (2017)]. In the case of thin superconducting film the emergence of the spontaneous surface currents causes the increase of the superconducting critical temperature and we calculate the actual value of the critica…
Superconducting Low-Inductance Undulatory Galvanometer Microwave Amplifier
介绍了一种基于超导低感波动电流计（SLUG）的微波放大器。SLUG嵌入在微带谐振器中，信号电流直接注入器件环路。在30 mK下的测量结果显示，在3 GHz下增益为25 dB，在9 GHz下增益为15 dB。放大器的性能很好地描述了一个简单的数值模型的基础上的约瑟夫森结相位动力学。我们期望基于高临界电流结的优化器件在5-10 GHz的频率范围内实现大于15 dB的增益、数百MHz的带宽和一阶量子的附加噪声。
Spectroscopy of superconducting charge qubits coupled by a Josephson inductance
我们设计并实验实现了一个电感耦合超导电荷量子比特电路，其中约瑟夫森结用作电感，量子比特之间的耦合由外加的磁通量控制。电路上的光谱测量与理论计算符合得很好。我们观察到了反交叉，它起源于量子比特和约瑟夫森结的等离子体模之间的耦合。此外，反交叉的大小取决于外部磁通量，这表明耦合的可控性。
Supercurrent interference and its transfer in a kagome superconductor
本研究通过分析KV3Sb5环与薄片的磁阻和临界电流，揭示了其电荷2e配对及本征超导相位相干性，并发现超导电流干涉图案的转移现象，为Cooper配对行为提供了新见解。
Properties of superconducting nanowires set the performance level for Superconducting Nanowire Single Photon Detectors (SNSPD). Reset time in commonly employed large area SNSPDs,5-10ns,is known to be limited by the nanowires kinetic inductance.On the other hand, reduction of the kinetic inductance in small area (waveguide integrated) SNSPDs prevents biasing them close to the critical current due to latching into a permanent resistive state.In order to reduce the reset time in SNSPDs, superconducting nanowires with both low kinetic inductance and fast electron energy relaxation are required. In…
Kinetic Inductance of Few-Layer NbSe$_2$ in the Two-Dimensional Limit
研究少层NbSe₂在二维极限下的动能电感及其非线性特性，揭示其在超导量子器件中的应用潜力。
We predict that long-range triplet correlations (LRTC) in superconductor/ferromagnet (S/F) hybrids with extrinsic impurity spin-orbit coupling (SOC) can be generated and manipulated by supercurrent flowing in the superconducting leads along the S/F interfaces. The LRTC appear via two basic mechanisms. The essence of the first one is the generation of triplets by the superconducting spin Hall effect. These pairs are long-range in the ferromagnet under the appropriate mutual orientation of the condensate momentum and the ferromagnet magnetization. The second mechanism is based on the singlet-tri…
Superconducting Transport in single and parallel double InAs Quantum Dot Josephson Junctions with Nb-based Superconducting Electrodes
本文报道了与Nb或NbTiN超导电极接触的InAs单量子点和平行双量子点约瑟夫森结的电导和超电流测量结果。观察到大的超导能隙能、高的临界场和大的开关电流，这些都反映了Nb基电极的特点。对于平行双点，当两个点都处于共振状态时，我们观察到增强的超电流，这可能反映了分裂的库珀对隧穿。
Terahertz Electrodynamics and Kinetic Inductance of Disordered Titanium-Vanadium Alloy Thin Films
利用太赫兹时域光谱研究无序Ti40V60合金薄膜，揭示无序对超导高频电动力学响应及动感电感的调控作用。
A magnetic adatom chain, proximity coupled to a conventional superconductor with spin-orbit coupling, exhibits locally an odd-parity, spin-triplet pairing amplitude. We show that the singlet-triplet junction, thus formed, leads to a net spin accumulation in the near vicinity of the chain. The accumulated spins are polarized along the direction of the local $\mathbf{d}$-vector for triplet pairing and generate an enhanced persistent current flowing around the chain. The spin polarization and the "supercurrent" reverse their directions beyond a critical exchange coupling strength at which the sin…
Flux coupled tunable superconducting resonator
本文设计并实现了一种通过磁通耦合实现频率可调谐的超导谐振器，在2.7 GHz附近实现160 MHz连续调谐，并演示了频率上转换和三波混频，适用于阵列复用及片上集成。
Supercurrent reversal in ferromagnetic hybrid nanowire Josephson junctions
该研究测量 InAs/EuS/Al 混合纳米线约瑟夫森结，发现超导窗口内 0 相与 π 相突变，并将其归因于 EuS 磁畴翻转导致的超电流反转。
Scanning transmission x-ray microscopy has been used to image electric currents in superconducting films at temperatures down to 20 K. The magnetic stray field of supercurrents in a thin YBaCuO film is mapped into a soft-magnetic coating of permalloy. The so created local magnetization of the ferromagnetic film can be detected by dichroic absorption of polarized x-rays. To enable high-quality measurements in transmission geometry the whole heterostructure of ferromagnet, superconductor and single-crystalline substrate has been thinned to an overall thickness of less than 1 micron. With this no…
Examining the possibility of chiral superconductivity in Sr$_2$RuO$_4$ and other compounds via applied supercurrent
本文提出用面内超电流破坏四方对称性，通过研究相图、比热异常和隧穿谱差异来探测Sr$_2$RuO$_4$及其他候选材料中的手性超导序。
We estimate the depairing current of superconducting nanowire single photon detectors (SNSPDs) by studying the dependence of the nanowires kinetic inductance on their bias current. The kinetic inductance is determined by measuring the resonance frequency of resonator style nanowire coplanar waveguides both in transmission and reflection configurations. Bias current dependent shifts in the measured resonant frequency correspond to the change in the kinetic inductance, which can be compared with theoretical predictions. We demonstrate that the fast relaxation model described in the literature ac…
Ginzburg-Landau (GL) parameters formed the basis for Abrikosov discovery of the quantum vortex of a supercurrent in type-II superconductor with a normal core of size $ξ$, the superconductor coherence length and circulating supercurrent induced magnetic field diverging as $log(1/r)$ from the core with a decay length of the London penetration depth, $λ_L.$ In 1964, J. Pearl predicted the slowly decaying $(1/r^2)$ field around a vortex spreading out to Pearl length, $P_L=2λ_L^2/t$, in a superconductor film of thickness $t < λ_L$. However, his quintessential theory failed to predict the existence …
We report on the fabrication and measurement results of the electrical transport properties of superconductor-normal metal-superconductor (SNS) weak links, made of PbIn superconductor and Au metal. The maximum supercurrent reaches up to ~ 6 μA at T = 2.3 K and the supercurrent persists even at higher temperature of T = 4.7 K. Magnetic field dependence of the critical current is consistent with a theoretical fit using the narrow junction model. The superconducting quantum interference device (SQUID) was also fabricated using two PbIn-Au-PbIn junctions connected in parallel. Under perpendicular …
Superconducting Photocurrent and Light Enriched Supercurrent Phase Relation
本文论证超导光电流可改变超导电流相位关系，产生光控感性响应和二极管效应，为测量超导光电流及绘制量子几何提供新方案。
We investigate superconducting quantum interference devices consisting of two highly transmissive Josephson junctions coupled by a superconducting loop, all defined in an epitaxial InAs/Al heterostructure. A novel device design allows for independent measurements of the Andreev bound state spectrum within the normal region of a junction and the resulting current-phase relation. We show that knowledge of the Andreev bound state spectrum alone is enough to derive the independently measured phase dependent supercurrent. On the other hand, the opposite relation does not generally hold true as deta…
Ultrahigh-inductance materials from spinodal decomposition
针对无序超导氮化物提升动电感面临材料质量受损的挑战，提出通过调幅分解大幅提高超导材料动电感的方法，以Ti0.48Al0.52N为模型首次实现绝缘体-超导体转变，测得动电感提升2-3个数量级，为先进超导量子电路的电感控制铺平道路。
Non-Invasive Readout of the Kinetic Inductance of Superconducting Nanostructures
本研究提出一种利用铌谐振器非侵入式探测铝环动力学电感的光谱技术，可关联谐振频移与超导态变化，为检测纳米器件相位滑移、研究库珀对密度提供新方法。
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