Article
Engineering, Electrical & Electronic
Stephen M. M. Bankson, Chase C. C. Tillman, John A. A. Sellers, Michael C. C. Hamilton
Summary: A modification to the Manhattan shadow method was studied in the fabrication of Josephson Junctions. It was found that without the modification, disconnects in the JJ top electrode caused by shadowing were observed. However, an additional Al deposition at 180° rotation in the initial shadow deposition improved the uniformity of top electrode coverage.
IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY
(2023)
Article
Chemistry, Multidisciplinary
Tycho J. Blom, Thomas W. Mechielsen, Remko Fermin, Marcel B. S. Hesselberth, Jan Aarts, Kaveh Lahabi
Summary: This study introduces a fully additive direct-write approach using a scanning electron microscope to print substrate-conformal Josephson devices in minutes, avoiding resource-intensive and multistep procedures. By utilizing electron-beam-induced deposition, the researchers were able to fabricate Josephson junctions with superconducting electrodes and metallic weak links, adjusting their Josephson coupling. The behavior of these junctions was characterized through microwave-induced Shapiro response and field-dependent transport, providing a versatile and nondestructive alternative to traditional nanofabrication.
Article
Chemistry, Multidisciplinary
Daniel Z. Haxell, Marco Coraiola, Manuel Hinderling, Sofieke C. ten Kate, Deividas Sabonis, Aleksandr E. Svetogorov, Wolfgang Belzig, Erik Cheah, Filip Krizek, Ruediger Schott, Werner Wegscheider, Fabrizio Nichele
Summary: We performed measurements on planar Josephson junctions with independent control over the two superconducting phase differences and observed an anomalous phase shift in the current-phase relation of one junction as a function of gate voltage or phase difference in the other junction. This demonstrates the nonlocal Josephson effect and the implementation of a tunable f(0)-junction. The anomalous phase shift is more significant at shorter distances between the junctions and disappears for distances much longer than the superconducting coherence length. The results indicate the formation of an Andreev molecule through the hybridization of Andreev bound states. The devices could serve as tunable superconducting phase sources and enable new coupling schemes for hybrid quantum devices.
Article
Chemistry, Multidisciplinary
Jongyun Lee, Wonjun Lee, Gi-Yeop Kim, Yong-Bin Choi, Jinho Park, Seong Jang, Genda Gu, Si-Young Choi, Gil Young Cho, Gil-Ho Lee, Hu-Jong Lee
Summary: The research found that the anisotropic superconducting order parameters in twisted Bi-2212 vdW junctions exhibit different Josephson couplings at different twist angles, with the maximum coupling occurring at 0 degrees and 90 degrees twist angles. The twist angle dependence of the Josephson coupling was quantitatively explained by theoretical calculations, revealing the anisotropic nature of Bi-2212 and providing a novel fabrication technique compatible with air-sensitive vdW materials.
Article
Materials Science, Multidisciplinary
Ville A. J. Pyykkonen, Sebastiano Peotta, Philipp Fabritius, Jeffrey Mohan, Tilman Esslinger, Paivi Torma
Summary: This theoretical study focuses on transport through a finite-size sawtooth lattice coupled to fermionic reservoirs in a superfluid state. It reveals that flat-band states support larger critical current and temperature than dispersive band states, requiring tuning of the boundary states at resonance with the flat-band states. The two-terminal configuration transport can show the linear dependence of key quantities on interaction strength, reflecting the geometric contribution of flat-band superconductivity.
Article
Materials Science, Multidisciplinary
Fumikazu Oguro, Yudai Sato, Kanta Asakawa, Masahiro Haze, Yukio Hasegawa
Summary: The study found that steps in the Si(111)-root 3 x root 43 Pb reconstructed structure significantly disrupt the electronic states of the superconducting atomic layer and hold Josephson-like vortices under the out-of-plane magnetic field. Monolayer superconductors exhibit unique properties under different magnetic field directions, providing potential for superconducting materials with high tolerance against magnetic fields.
Article
Physics, Multidisciplinary
Shahrukh Salim, Rahul Marathe, Sankalpa Ghosh
Summary: In this study, we compare the theory with experimental results on charge transport through Josephson junctions made of graphene. A transfer matrix approach is used to analytically derive the spectrum of Andreev bound states (ABS) in a superconductor-graphene-superconductor junction, focusing on monolayer graphene. The theoretical results successfully explain both the retro Andreev reflection (RAR) and specular Andreev reflection (SAR) phenomena within the relevant parameter range. By evaluating the current and conductance using the ABS spectrum and experimental system parameters, we find good agreement with experimental results, with the calculated values showing scaling behavior with junction length and significantly lower values when RAR is dominant.
Article
Engineering, Electrical & Electronic
Kanji Hayashi, Teppei Ueda, Ryo Ohtani, Seiichiro Ariyoshi, Saburo Tanaka
Summary: In this study, nanobridge Josephson junctions were created using gallium focused ion beam (FIB) irradiation, with an optimized fabrication process resulting in junctions with a width of 80 nm. High critical current density (J(C)) HTS films were used to fabricate junctions showing up to five Shapiro steps at 77 K.
IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY
(2021)
Article
Physics, Applied
I. N. Askerzade, D. Matrasulov, M. Salati
Summary: This study investigates the Josephson penetration depth in long junctions between single- and multi-band superconductors by considering the frustration effects in a multi-band superconducting state. Through the effective critical current approach, it is shown that the Josephson penetration depth in such structures can exhibit qualitative features caused by the frustration effects in two- and three-band superconductors.
JOURNAL OF SUPERCONDUCTIVITY AND NOVEL MAGNETISM
(2022)
Article
Nanoscience & Nanotechnology
Saumen Acharjee, Umananda Dev Goswami
Summary: The study reveals the presence of anomalous Andreev bound states, Majorana mode, and Josephson supercurrent in the structure of clean noncentrosymmetric superconductor/half-metal/noncentrosymmetric superconductor under specific conditions, which can be controlled by the ratio of magnetic moments.
PHYSICA E-LOW-DIMENSIONAL SYSTEMS & NANOSTRUCTURES
(2022)
Article
Physics, Multidisciplinary
Ziwen Chen, Yulong Li, Rui Zhu, Jun Xu, Tiequan Xu, Dali Yin, Xinwei Cai, Yue Wang, Jianming Lu, Yan Zhang, Ping Ma
Summary: As a newly developed method, focused helium ion beam offers the advantage of producing reliable and reproducible Josephson junctions. In this study, Josephson junctions were fabricated on 50 nm YBa2Cu3O7 - delta (YBCO) thin films using a focused helium ion beam. The experiment showed that the junction barrier can be modulated by the ion dose, and within a certain dose range, the junctions exhibit superconductor-normal conductor-superconductor characteristics. The measurement results demonstrate the high reproducibility of junction fabrication using a focused helium ion beam and suggest the possibility of commercial devices based on this nanotechnology operating at liquid nitrogen temperatures.
CHINESE PHYSICS LETTERS
(2022)
Article
Physics, Applied
Zahra Shomali
Summary: The spin transfer torque (STT) is studied in Josephson junctions containing triplet p-wave chiral ferromagnetic superconductor reservoirs. The effects of different potential strengths in the spin orbit coupling layers and barrier strength on the behavior of the STT are investigated. It is found that two spin orbit coupling layers with different potential strengths reduce the out-of-plane STT, while the barrier strength variation changes the sign and value of the STT.
SUPERCONDUCTOR SCIENCE & TECHNOLOGY
(2022)
Article
Physics, Applied
Huili Zhang, Duo Zhang, Weihua Shao, Wanghao Tian
Summary: We fabricated a hybrid Josephson junction using a multiband Fe-based superconductor (FeSC) Ba0.5K0.5Fe2As2 and a conventional superconductor Nb, with an Al layer as a highly transparent barrier. Detailed electrical transportations were studied, showing strong Josephson effects through the observation of Shapiro steps and Fraunhofer-like pattern. An unusual temperature-dependent critical current was observed, which was not well described by the conventional Ambegaokar-Baratoff relation. By considering both the multiband properties in FeSC and the conventional superconductor/normal metal/superconductor Josephson junction theory, we attributed this temperature dependence on critical current to the barrier transparency of the Josephson junction. We hope our studies can provide reference for the applications or physics research of FeSC Josephson junctions.
JOURNAL OF LOW TEMPERATURE PHYSICS
(2023)
Article
Physics, Applied
Seiji Adachi, Akira Tsukamoto, Yasuo Oshikubo, Tsunehiro Hato, Keiichi Tanabe
Summary: The latest research focused on using new barrier materials for the fabrication of ramp-edge-type Josephson junctions and SQUIDs. Different derivatives with YBCO-type structures were examined, with TaBa2LaCu2O y showing promising results in terms of large critical currents and modulation voltages for SQUIDs.
JAPANESE JOURNAL OF APPLIED PHYSICS
(2021)
Article
Physics, Condensed Matter
M. S. Shevchenko, L. Filippenko, O. S. Kiselev, V. P. Koshelets
Summary: This study investigates tunneling superconductor-insulator-superconductor (SIS) Josephson junctions with a new type of shunt consisting of an additional superconductor-insulator-normal metal (SIN) junction placed around the SIS junction. The parameters of the shunted junctions are numerically calculated and their current-voltage characteristics (IVC) are simulated. The designed structures are assembled in real samples and their parameters are studied, including the measurement of IVC for junctions with different degrees of shunting, and the study of their behavior under the influence of high-frequency signals in the subterahertz range.
PHYSICS OF THE SOLID STATE
(2022)
Article
Physics, Applied
B. Budinska, B. Aichner, D. Yu Vodolazov, M. Yu Mikhailov, F. Porrati, M. Huth, A. Chumak, W. Lang, O. Dobrovolskiy
Summary: Ultrafast vortex motion has been extensively investigated. In this study, we found that in 15-nm-thick MoSi strips with smooth edges, critical currents were larger, maximal vortex velocities were higher, and relaxation times were shorter. Moreover, the deduction of intrinsic relaxation times from current-voltage curves requires careful consideration of sample quality and edge pinning.
PHYSICAL REVIEW APPLIED
(2022)
Article
Chemistry, Multidisciplinary
Raphael Behrle, Vanessa Krause, Michael S. Seifner, Benedikt Koestler, Kimberly A. Dick, Matthias Wagner, Masiar Sistani, Sven Barth
Summary: Si1-xGex nanowires (NWs) were prepared using a single-source precursor with preformed Si-Ge bonds through gold-supported chemical vapor deposition (CVD). The process reduces the control parameters associated with decomposition characteristics and dosing of individual precursors. The synthesized Si1-xGex/Au core-shell NWs exhibit metal-like behavior and show potential for applications in nano- and quantum-electronics.
Article
Chemistry, Multidisciplinary
Fabrizio Porrati, Sven Barth, Gian Carlo Gazzadi, Stefano Frabboni, Oleksii M. Volkov, Denys Makarov, Michael Huth
Summary: Recent advancements in additive manufacturing have allowed the fabrication of free-shaped 3D objects with micrometer-scale feature sizes. Among these methods, focused electron beam and focused ion beam-induced deposition offer high flexibility and accuracy, providing a wide range of materials for growth. The combination of 3D nanowriting and chemical vapor deposition techniques enables the synthesis of complex core-shell heterostructures, showcasing great potential for unlocking further functionalities.
Article
Physics, Applied
Sebastian Knauer, Kristyna Davidkova, David Schmoll, Rostyslav O. Serha, Andrey Voronov, Qi Wang, Roman Verba, Oleksandr V. Dobrovolskiy, Morris Lindner, Timmy Reimann, Carsten Dubs, Michal Urbanek, Andrii V. Chumak
Summary: In this study, spin-wave propagation in a 100 nm-thick yttrium-iron-garnet (YIG) film at millikelvin temperatures was demonstrated using stripline nanoantennas for electrical excitation and detection. The results showed clear transmission characteristics over a 10 μm distance, with the measured spin-wave group velocity and YIG saturation magnetization matching the theoretical values. The influence of the gadolinium-gallium-garnet (GGG) substrate on spin-wave propagation characteristics was also investigated.
JOURNAL OF APPLIED PHYSICS
(2023)
Article
Materials Science, Multidisciplinary
Volodymyr M. Bevz, Barbora Budinska, Sebastian Lamb-Camarena, Stanislava O. Shpilinska, Clemens Schmid, Mikhail Yu. Mikhailov, Wolfgang Lang, Oleksandr V. Dobrovolskiy
Summary: Superconducting bridges exhibit Josephson effects, such as electromagnetic radiation and voltage kinks in the current-voltage curves. The presence of defects and fluctuations results in a 2D vortex jet rather than the 1D vortex chain predicted by the Aslamazov and Larkin theory. Milling slits in a MoSi thin strip allows for controlled movement of vortices in either a vortex-jet or a vortex-chain fashion.
PHYSICA STATUS SOLIDI-RAPID RESEARCH LETTERS
(2023)
Article
Chemistry, Analytical
Andreas Pfuetzner, Barbora Tencer, Boris Stamm, Mandar Mehta, Preeti Sharma, Rustam Gilyazev, Hendrick Jensch, Nicole Thome, Michael Huth
Summary: The Sencell sensor uses osmotic pressure chamber and nano-granular tunneling resistive pressure sensors to measure glucose continuously in a small device. The miniaturized sensors showed reliable pressure changes in benchmark and dynamic glucose tests. The NTR pressure sensor technology successfully reduced the size of the core osmotic pressure chamber by more than 95% without compromising the osmotic pressure signal.
Article
Chemistry, Multidisciplinary
Robert Winkler, Michele Brugger-Hatzl, Lukas Matthias Seewald, David Kuhness, Sven Barth, Thomas Mairhofer, Gerald Kothleitner, Harald Plank
Summary: Magnetic force microscopy (MFM) is extended by the additive direct-write fabrication of magnetic nano-cones via focused electron beam-induced deposition (FEBID) using an HCo3Fe(CO)(12) precursor. Highly crystalline nano-tips with minimal surface contamination and sub-15 nm apex radii are fabricated and benchmarked against commercial products. The results demonstrate high performance during MFM operation and virtually loss-free behavior after almost 8 hours of continuous operation, as well as no performance loss after more than 12 months of storage in ambient conditions for the FEBID-based Co3Fe MFM nano-probes introduced in this study.
Article
Chemistry, Multidisciplinary
Alexander Kuprava, Michael Huth
Summary: Focused electron-beam-induced deposition (FEBID) is a versatile direct-write approach for 3D nanofabrication of functional materials. A new numerical simulation approach is described to study the influence of growth parameters on the shape of the 3D structures. The modular nature of the simulation method allows for future performance improvements using parallelization or graphics cards. Combining the simulation approach with beam-control pattern generation will optimize shape transfer for 3D FEBID.
Article
Physics, Applied
V. M. Bevz, M. Yu. Mikhailov, B. Budinska, S. Lamb-Camarena, S. O. Shpilinska, A. V. Chumak, M. Urbanek, M. Arndt, W. Lang, O. V. Dobrovolskiy
Summary: We introduce an approach for the quantitative determination of nv and v*, and observe the quantization of v* in superconducting microstrip single-photon detectors. By observing kinks in the I-V curves of wide MoSi thin strips, we deduce v* ' 12 km/s. Our findings are crucial for the development of few-fluxon devices and provide a demanded approach for deducing maximal vortex velocities in SMSPD operation conditions.
PHYSICAL REVIEW APPLIED
(2023)
Article
Chemistry, Multidisciplinary
Robert Winkler, Michele Brugger-Hatzl, Fabrizio Porrati, David Kuhness, Thomas Mairhofer, Lukas M. Seewald, Gerald Kothleitner, Michael Huth, Harald Plank, Sven Barth
Summary: This study provides solid evidence on the decomposition process of the HFeCo3(CO)(12) precursor, emphasizing the influence of microstructure and composition on the properties of electron beam-induced deposits. It reveals the activity of different fragmentation channels during single-spot growth processes.
Article
Chemistry, Multidisciplinary
Sebastian Lamb-Camarena, Fabrizio Porrati, Alexander Kuprava, Qi Wang, Michal Urbanek, Sven Barth, Denys Makarov, Michael Huth, Oleksandr V. Dobrovolskiy
Summary: Magnonics is a rapidly developing field in nanomagnetism, with potential applications in information processing systems. This study demonstrates the fabrication of 3D magnonic nanoconduits using the focused-electron-beam induced deposition (FEBID) technique. The researchers use Brillouin light scattering (BLS) spectroscopy to compare the spin-wave resonances of 2D and 3D nanostructures, revealing significant qualitative differences due to the non-uniformity of the internal magnetic field. This work highlights the additive manufacturing capability of FEBID for magnetic 3D nanoarchitectures and presents the first characterization of FEBID conduits using BLS spectroscopy.
