Article
Chemistry, Physical
Victor Kleshch, Vitali Porshyn, Anton S. Orekhov, Andrey S. Orekhov, Dirk Luetzenkirchen-Hecht, Alexander N. Obraztsov
Summary: Researchers successfully created a stable point electron source composed of a carbon nanowire and a diamond nanotip electrically coupled through a tunnel junction. Using energy spectroscopy analysis, they characterized the electrons released from nanometer-scale carbon heterostructures. The experimental results demonstrate promising characteristics for practical realization of coherent single-electron guns.
Article
Materials Science, Multidisciplinary
Chuanshuai Huang, Yajun Wei, Yongchun Tao, Jun Wang
Summary: The study shows that by controlling the orientation of the exchange field, a 0-π transition can be achieved in graphene-based superconductor-ferromagnet-R-superconductor structures, while varying the RSOC strength λ does not directly affect this transition, but it is a necessary condition for the transition induced by changing the orientation.
Article
Chemistry, Multidisciplinary
Tosson Elalaily, Oliver Kurtossy, Zoltan Scherubl, Martin Berke, Gergo Fulop, Istvan Endre Lukacs, Thomas Kanne, Jesper Nygard, Kenji Watanabe, Takashi Taniguchi, Peter Makk, Szabolcs Csonka
Summary: Researchers have achieved gate-controlled supercurrent for the first time on InAs nanowires, where the supercurrent in the epitaxial Al layer can be switched to the normal state by applying a voltage. Despite ruling out the electric field as the origin of GCS in their device through extensive study of temperature and magnetic field dependencies, they find that a recent model based on non-equilibrium phonons is compatible with most of their results.
Article
Physics, Multidisciplinary
Patrick Zellekens, Russell Deacon, Pujitha Perla, Detlev Gruetzmacher, Mihail Ion Lepsa, Thomas Schaepers, Koji Ishibashi
Summary: In this study, low-loss superconducting microwave circuits were fabricated using a flip-chip method, and the intrinsic excitation spectrum of nanowire Josephson junctions was studied spectroscopically using this platform. The experimental results showed clear transitions between single quasiparticles and quasiparticle pairs in specific conditions.
COMMUNICATIONS PHYSICS
(2022)
Article
Materials Science, Multidisciplinary
Manas Ranjan Sahu, Arup Kumar Paul, Jagannath Sutradhar, K. Watanabe, T. Taniguchi, Vibhor Singh, Subroto Mukerjee, Sumilan Banerjee, Anindya Das
Summary: By measuring shot noise and electrical conductance in a graphene-based quantum Hall-superconductor junction, we were able to detect Andreev edge states and observe the intriguing behavior of the Fano factor of shot noise at different bias energies.
Article
Physics, Applied
M. S. Anwar, J. A. Potter, J. C. Fenton
Summary: Measurements of NbN nanowires showed that the critical voltage can be tuned using a side-gate electrode, with periodic variations as the gate voltage changes. However, the tuning period was larger than expected based on capacitance considerations, with two significant abrupt changes observed during measurements. The behavior may possibly arise from granular Josephson junctions in the nanowire.
SUPERCONDUCTOR SCIENCE & TECHNOLOGY
(2021)
Article
Chemistry, Multidisciplinary
Tosson Elalaily, Martin Berke, Mate Kedves, Gergo Fulop, Zoltan Scherubl, Thomas Kanne, Jesper Nygard, Peter Makk, Szabolcs Csonka
Summary: Understanding the microscopic origin of GCS is crucial for engineering superconducting switches. In this study, GCS in a Ta layer on InAs nanowires was investigated. The GCS was found to be determined by gate leakage power. The influence of the gate and temperature on the magnetic field dependence of the supercurrent was also analyzed.
Article
Chemistry, Multidisciplinary
Martin Saurbrey Bjergfelt, Damon J. Carrad, Thomas Kanne, Erik Johnson, Elisabetta M. Fiordaliso, Thomas Sand Jespersen, Jesper Nygard
Summary: Crystalline indium islands were in situ synthesized on InAs nanowires grown by molecular beam epitaxy, showing potential for a pristine In/InAs interface and Cooper pair charging behavior. The engineered crystal morphology and isolation of single islands using shadow epitaxy provides a new alternative for semiconductor/superconductor hybrid structures.
Article
Multidisciplinary Sciences
Marc P. Roeoesli, Michael Hug, Giorgio Nicoli, Peter Maerki, Christian Reichl, Bernd Rosenow, Werner Wegscheider, Klaus Ensslin, Thomas Ihn
Summary: The study demonstrates Coulomb blockade of fractional charges and the formation of incompressible regions at fractional filling factors, leading to conclusions about the fractional quasi-particle charge. The research extends and complements Fabry-Perot interference experiments in investigating the nature of anyonic fractional quasi-particles in the quantum Hall effect.
Article
Chemistry, Multidisciplinary
Omer Arif, Valentina Zannier, Francesca Rossi, Daniele Ercolani, Fabio Beltram, Lucia Sorba
Summary: The study presents the self-catalyzed growth of InAs/InSb/InAs axial heterostructured nanowires with a single defect-free InSb quantum dot on Si substrates using chemical beam epitaxy. By systematically varying the growth parameters, the researchers found that the growth temperature strongly influences the axial and radial growth rates of the top InAs segment, allowing for control over the thickness of the InAs shell around the InSb quantum dot. Additionally, the study highlights the importance of In diffusion paths and the interplay of growth mechanisms in determining the final shape of the nanowires.
Article
Multidisciplinary Sciences
I Golokolenov, A. Guthrie, S. Kafanov, Yu A. Pashkin, V Tsepelin
Summary: Superconducting quantum devices have a variety of applications and are controlled by Josephson junctions via electric current or magnetic field. Recent reports on the field effect in superconducting devices may revolutionize the field of superconductor electronics, although controversy exists.
NATURE COMMUNICATIONS
(2021)
Article
Materials Science, Multidisciplinary
Yuchen Tang, Christina Knapp, Jason Alicea
Summary: Transport through proximitized quantum Hall edge in quantum Hall-superconductor heterostructures is studied, with a particular focus on the impact of vortices in the superconductor. It is found that subgap vortex levels mediate Andreev processes and the superconductor behaves like a normal contact in certain conditions.
Article
Chemistry, Multidisciplinary
In Kim, Suji Choi, Ji-Hwan Kwon, Sang Jung Ahn, Min Sun Yeom, Ho Seong Lee, Seong-Hoon Yi, Young Heon Kim
Summary: The intermediate status during the vaporization process of InAs NWs in an Al2O3 shell was studied, confirming the formation of As clusters by analyzing high-angle annular dark field images and energy-dispersive X-ray spectra. The results showed that As clusters existed independently in the shell and were also observed at the end of the InAs pieces obtained after quenching.
Article
Physics, Multidisciplinary
Xingfei Zhang, Yiyun Zhang, Dong Pan, Xiaoyan Yi, Jianhua Zhao, Jinmin Li
Summary: One-dimensional indium arsenide nanowire photodetectors with a metal-semiconductor-metal structure exhibit strong negative photoconductive effects and high gain, showing potential applications in visible/near-infrared light communication.
FRONTIERS IN PHYSICS
(2021)
Article
Materials Science, Multidisciplinary
Yi-Xin Dai, Yue Mao, Qing-Feng Sun
Summary: This study theoretically investigates the unconventional spin-triplet correlation in Ising superconductors and reveals the existence of spin superconductivity in Ising superconductors. The transport process in a normal metal-Ising superconductor junction is analyzed, showing the contribution of equal-spin Andreev reflection and spin-flip reflection. The findings broaden the scope of spin superconductivity and suggest potential applications of Ising superconductors in spintronics.
Article
Chemistry, Multidisciplinary
Xiaobo Li, Mengmeng Meng, Shaoyun Huang, Congwei Tan, Congcong Zhang, Hailin Peng, H. Q. Xu
Summary: We experimentally studied the quantum transport in a topological insulator Bi2Te3 nanoplate and found that the carrier density in the nanoplate decreases while the mobility increases with decreasing top-gate voltage. Low-field magnetotransport measurements showed weak anti-localization characteristics. By considering the surface-bulk coherent electron scattering, we extracted important parameters such as dephasing times, diffusion coefficients, and surface-bulk scattering times, which helped us understand the quantum transport measurements at low temperatures.
Article
Nanoscience & Nanotechnology
Li Zhang, Yuanjie Chen, Dong Pan, Shaoyun Huang, Jianhua Zhao, H. Q. Xu
Summary: InSb nanosheet/hBN/graphite trilayers were fabricated and characterized, and single- and double-gate devices made from the trilayers were realized. The measurements showed high electron field-effect mobility and well-defined Shubnikov-de Haas oscillations in the InSb nanosheet.
Article
Physics, Multidisciplinary
Yosuke Sato, Kento Ueda, Yuusuke Takeshige, Hiroshi Kamata, Kan Li, Lars Samuelson, H. Q. Xu, Sadashige Matsuo, Seigo Tarucha
Summary: The Josephson junction of a strong spin-orbit material under a magnetic field can exhibit supercurrent enhancement, which has been attributed to topological transitions. However, this work suggests a non-topological origin, proposing that the trapping of quasiparticles by vortices explains the observed phenomena. The observed hysteresis of the switching current provides support for this explanation. This experiment highlights the importance of quasiparticles in superconducting devices with a magnetic field, offering important insights for the design of qubits using superconductors.
PHYSICAL REVIEW LETTERS
(2022)
Article
Physics, Applied
Xiaobo Li, Haitian Su, H. Q. Xu
Summary: A thin, narrow-bandgap semiconductor Bi2O2Te nanosheet was obtained and studied, revealing its quasi-2D and strong disordered electron transport with strong spin-orbit interaction and classical origin.
APPLIED PHYSICS LETTERS
(2022)
Article
Instruments & Instrumentation
Mats O. Tholen, Riccardo Borgani, Giuseppe Ruggero Di Carlo, Andreas Bengtsson, Christian Krizan, Marina Kudra, Giovanna Tancredi, Jonas Bylander, Per Delsing, Simone Gasparinetti, David B. Haviland
Summary: This paper introduces a digital microwave platform called Presto, which is designed for measuring and controlling multiple quantum bits. Presto utilizes direct digital synthesis to create signals and analyze responses on its ports. It has various features, including digital triggers, continuous-wave outputs, and DC-bias outputs. The scalability of Presto allows for experiments with a large number of qubits. The authors also demonstrate the capabilities of Presto in experiments involving two superconducting qubits.
REVIEW OF SCIENTIFIC INSTRUMENTS
(2022)
Article
Physics, Multidisciplinary
Marco Scigliuzzo, Giuseppe Calajo, Francesco Ciccarello, Daniel Perez Lozano, Andreas Bengtsson, Pasquale Scarlino, Andreas Wallraff, Darrick Chang, Per Delsing, Simone Gasparinetti
Summary: The article introduces a novel microwave architecture consisting of compact superconducting resonators with embedded tunable-frequency artificial atoms, which enables the study of atom-field interaction, implementation of quantum simulation, and photon transport experiments.
Article
Physics, Applied
Zhencun Pan, Dong Pan, Yifeng Zhou, Jianhua Zhao, H. Q. Xu, Shaoyun Huang
Summary: Dual-gate structures were fabricated on a high-quality InAs/GaSb core/shell nanowire, enabling control of the band structure and Fermi level in the crossed bandgap heterostructure. Ambipolar transport characteristics derived separately from n-type InAs and p-type GaSb were demonstrated. An energy gap, which could be closed by adjusting the electric fields of dual gates, appeared and showed a weak and non-vanishing energy gap after closure. The reopened energy gap was suppressed in an in-plane magnetic field perpendicular to the axis of the nanowire, indicating an electron-hole interaction induced hybridization gap.
JOURNAL OF APPLIED PHYSICS
(2023)
Article
Physics, Applied
Hampus Renberg Nilsson, Anita Fadavi Roudsari, Daryoush Shiri, Per Delsing, Vitaly Shumeiko
Summary: In this study, we extend the theory for a Josephson-junction traveling-wave parametric amplifier (TWPA) and propose a scheme for achieving high gain. We develop a continuous three-mode model to describe a discrete chain of Josephson junctions at high frequencies and a continuous multimode model for small frequencies with linear frequency dispersion. The gain is found to be significantly reduced in both cases due to the strong dispersion at high frequencies and up-converted modes at small frequencies. To recover the high gain, we propose engineering a chain with dispersive features and placing the pump frequency within the upper band close to the spectral cutoff.
PHYSICAL REVIEW APPLIED
(2023)
Article
Chemistry, Multidisciplinary
Ding-Ming Huang, Xu Wu, Kai Chang, Hao Hu, Ye-Liang Wa, H. Q. Xu, Jian-Jun Zhang
Summary: Van der Waals (vdW) layered materials have rich novel physical properties, which strongly depend on their structures. The strain effects in a kind of vdW layered material of spiral antimonene grown on a germanium (Ge) substrate are studied. Spontaneous inter-layer twist and in-plane anisotropic strain are observed in scanning tunneling microscope (STM) measurements. The strain in the spiral antimonene can be significantly modified by STM tip interaction, leading to a variation in the surface electronic density of states (DOS) and a large modification in the work function, which may have potential applications in building up novel piezoelectric devices.
Article
Quantum Science & Technology
Weijie Li, Zhihai Liu, Jingwei Mu, Yi Luo, Dong Pan, Jianhua Zhao, H. Q. Xu
Summary: A serial triple quantum dot (TQD) integrated with a quantum dot (QD) charge sensor was successfully realized using a fine finger-gate technique applied to an InAs nanowire. The complex charge states and intriguing properties of the TQD were studied in the few-electron regime through direct transport measurements and charge-sensor detection measurements. The TQD's charge stability diagrams were measured by the charge sensor and were well reproduced by simultaneous direct transport measurements and simulations based on an effective capacitance network model. In addition, the TQD was demonstrated and discussed as a quantum cellular automaton.
ADVANCED QUANTUM TECHNOLOGIES
(2023)
Article
Chemistry, Multidisciplinary
Shili Yan, Haitian Su, Dong Pan, Weijie Li, Zhaozheng Lyu, Mo Chen, Xingjun Wu, Li Lu, Jianhua Zhao, Ji-Yin Wang, Hongqi Xu
Summary: We conducted an experimental study on proximity-induced superconductivity in planar Josephson junction devices using free-standing InAs nanosheets. The nanosheets were grown by molecular beam epitaxy, and the devices were fabricated by directly contacting the nanosheets with Al electrodes. Low-temperature measurements showed gate-tunable supercurrent, multiple Andreev reflections, and a good quality superconductor-semiconductor interface. The superconducting characteristics of the Josephson junctions were analyzed based on the BCS theory at different magnetic fields and temperatures. The ac Josephson effect measurements under microwave radiation revealed the observation of integer Shapiro steps. This work demonstrates the potential of InAs nanosheet-based hybrid devices for exploring the forefront of physics, such as two-dimensional topological superconductivity.
Article
Multidisciplinary Sciences
X. L. He, Yong Lu, D. Q. Bao, Hang Xue, W. B. Jiang, Z. Wang, A. F. Roudsari, Per Delsing, J. S. Tsai, Z. R. Lin
Summary: This study presents a strategy to generate and preserve cat states in coplanar superconducting circuits through fast modulation of Kerr nonlinearity, addressing the challenges of scalability and controllability. The researchers were able to prepare a 2-component cat state with high fidelity in their chip-based device.
NATURE COMMUNICATIONS
(2023)
Article
Chemistry, Multidisciplinary
Sandra Benter, Yi Liu, Renan Da Paixao Maciel, Chin Shen Ong, Lassi Linnala, Dong Pan, Austin Irish, Yen-Po Liu, Jianhua Zhao, Hongqi Xu, Olle Eriksson, Rainer Timm, Anders Mikkelsen
Summary: This study presents new opportunities for controlling the chemical bonding between compound semiconductors and metals in nanostructures by temperature manipulation. The adsorption and incorporation of Bi on 2D InAs nanosheets were found to be temperature-dependent, and different bond configurations were observed for different crystal structures. The rate of Bi adsorption also varied significantly between InAs surfaces compared to standard Si substrates.
Article
Chemistry, Multidisciplinary
Weijie Li, Jingwei Mu, Zhi-Hai Liu, Shaoyun Huang, Dong Pan, Yuanjie Chen, Ji-Yin Wang, Jianhua Zhao, H. Q. Xu
Summary: This study presents a coupled quantum dot system consisting of two single quantum dots made in adjacent InAs nanowires, where one quantum dot acts as a charge sensor to detect charge state transitions in the other quantum dot. The researchers investigated the impact of tunneling barrier asymmetry on the detection visibility of charge state transitions in the target quantum dot.
Article
Chemistry, Multidisciplinary
Furong Fan, Yuanjie Chen, Dong Pan, Jianhua Zhao, H. Q. Xu
Summary: In this study, we experimentally investigated the spin-orbit interaction and quantum transport characteristics in a free-standing InAs nanosheet. By using a dual-gate field-effect device, we were able to independently control the carrier density in the nanosheet and the potential difference across it. Our results showed that by applying a voltage over the dual gate, the electron transport in the nanosheet can be tuned between weak antilocalization and weak localization regimes. We also observed a peak value of the spin-orbit length at which the Rashba-type spin-orbit interaction is suppressed and the Dresselhaus-type spin relaxation can be revealed.
NANOSCALE ADVANCES
(2022)
