Article
Materials Science, Multidisciplinary
S. Mojtaba Tabatabaei, David Sanchez, Alfredo Levy Yeyati, Rafael Sanchez
Summary: We discuss a quantum thermal machine that generates power from a thermally driven double quantum dot coupled to normal and superconducting reservoirs. Energy exchange between the dots is mediated by electron-electron interactions. We find that the heat engine efficiency increases with increasing coupling to the superconducting reservoir. The presence of the superconducting gap and the strong energy dependence of the electronic density of states around the gap edges contribute to large efficiencies. The competition between Andreev processes and quasiparticle tunneling is observed in the system. Our results emphasize the importance of both pair tunneling and structured band spectrum for an accurate characterization of the heat engine properties in normal-superconducting coupled dot systems.
Article
Chemistry, Multidisciplinary
Francesco Borsoi, Grzegorz P. Mazur, Nick van Loo, Leo Bourdet, Kongyi Li, Svetlana Korneychuk, Alexandra Fursina, Ji-Yin Wang, Vukan Levajac, Elvedin Memisevic, Ghada Badawy, Sasa Gazibegovic, Kevin van Hoogdalem, Erik P. A. M. Bakkers, Leo P. Kouwenhoven, Sebastian Heedt, Marina Quintero-Perez, Michal P. Nowak
Summary: This study introduces a novel fabrication concept based on shadow walls, enabling in situ, selective, and consecutive depositions of superconductors and normal metals to form defect-free semiconducting-superconducting interfaces. The method allows for the realization of devices in a single shot, eliminating fabrication steps after the synthesis of the fragile semiconductor/superconductor interface. The cleanliness of the technique enables systematic studies of topological superconductivity in nanowires and the synthesis of advanced nano-devices based on a wide range of material combinations and geometries while maintaining high interface quality.
ADVANCED FUNCTIONAL MATERIALS
(2021)
Article
Materials Science, Multidisciplinary
Regis Melin, Denis Feinberg
Summary: This article proposes an interferometric device to analyze the quartet mode in biased three-terminal Josephson junctions (TTJs) and provides experimental evidence for the emergence of a single stationary phase, known as the quartet phase. In the quartet superconducting quantum interference device (quartet SQUID), the flux sensitivity exhibits a periodicity of hc/4e, indicating the presence of a transient intermediate state involving two entangled Cooper pairs. The quartet SQUID offers information on the total quartet critical current and the phase lapse resulting from the quartet supercurrent and the phase-sensitive multiple Andreev reflection (phase MAR) quasiparticle current.
Article
Optics
Yuan Xie, Wansheng Liu, Wanyuan Deng, Haimei Wu, Weiping Wang, Yichuan Si, Xiaowei Zhan, Chao Gao, Xian-Kai Chen, Hongbin Wu, Junbiao Peng, Yong Cao
Summary: This study reports on the potential applications of high-efficiency organic light-emitting diodes (OLEG) in the short-wavelength infrared (SWIR) region. By using specific types of molecules, researchers have successfully fabricated high radiance SWIR OLEGs, which have various applications in biosensors, biomedical imaging and spectroscopy, and surveillance.
Article
Physics, Applied
N. Janzen, M. Kononenko, S. Ren, A. Lupascu
Summary: A simple process based on single-step electron-beam gradient exposure is used to implement aluminum air bridges in superconducting quantum devices, enabling increased circuit complexity and density. The resulting bridges have a wide range of sizes and a yield exceeding 99%. The induced loss contributed to the system is negligible, making the bridges highly practical.
APPLIED PHYSICS LETTERS
(2022)
Article
Materials Science, Multidisciplinary
Aanchal Sati, Anil Kumar, Vikash Mishra, Kamal Warshi, Preeti Pokhriyal, Archna Sagdeo, P. R. Sagdeo
Summary: The temperature-dependent impedance spectroscopy, optical absorption spectroscopy, and Raman spectroscopic measurements were conducted on BaTiO3 to investigate the correlation between dielectric loss, band gap, and electron-phonon coupling. It was found that in the tetragonal phase, dielectric loss increases slightly with temperature, while in the cubic phase, it decreases. Moreover, the electron-phonon coupling parameter increases with temperature and exhibits a sharp increase at the tetragonal to cubic transition temperature.
MATERIALS CHEMISTRY AND PHYSICS
(2021)
Article
Chemistry, Physical
Xiangsha Du, Hedi Ma, Xinwen Zhang, Meng Zhou, Zhongyu Liu, He Wang, Gangli Wang, Rongchao Jin
Summary: Alloying is an important strategy in tailoring the functionality of materials. In this study, a series of metal alloy nanoclusters were synthesized and characterized. The results showed that doping with heterometals can significantly improve the optical, electronic, and chemical properties of metal nanoclusters. Additionally, the bandgap of the alloy nanoclusters increased as the temperature decreased, indicating semiconductor behavior.
Article
Biochemistry & Molecular Biology
Jacqueline A. Labra-Munoz, Arie de Reuver, Friso Koeleman, Martina Huber, Herre S. J. van der Zant
Summary: This study reports the fabrication process of single-electron devices based on horse-spleen ferritin particles, and demonstrates the significance of single-electron charge transport in ferritin through the excellent agreement between experimental data and the Coulomb blockade theory, which provides potential for further characterization and applications in electronic and medical fields.
Article
Chemistry, Physical
Zabiollah Mahdavifar, Fazel Shojaei
Summary: The 2D compound CdInGaS4 shows promise in optoelectronic applications, with stable single and double-layer structures exhibiting favorable band gaps, electron mobility, and optical absorption coefficients.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Materials Science, Multidisciplinary
Xuexi Yan, Qianqian Jin, Yixiao Jiang, Tingting Yao, Xinwei Wang, Xiang Li, Chunyang Gao, Chunlin Chen, Hengqiang Ye, Xiu-Liang Ma
Summary: This study demonstrates that unidirectional threading dislocation arrays in an AlN thin film can emit ultraviolet light with a wavelength of -317 nm. By studying the atomic and electronic structures and band gaps of the AlN threading dislocations, it is found that these dislocations are comprised of edge, screw, and mixed dislocations. The defect states caused by the dangling bonds of Al and N at the dislocation cores contribute to the smaller band gaps exhibited by the AlN dislocations.
Article
Multidisciplinary Sciences
Jinzhong Zhang, Pok-Lam Tse, Abdur-Rehman Jalil, Jonas Koelzer, Daniel Rosenbach, Martina Luysberg, Gregory Panaitov, Hans Lueth, Zhigao Hu, Detlev Gruetzmacher, Jia Grace Lu, Thomas Schaepers
Summary: Despite the limited knowledge on the low-temperature transport properties of GeTe, this study reveals phase-coherent phenomena in GeTe nanowires. The magnetic flux-periodic oscillations observed in the study are attributed to the formation of a tubular hole accumulation layer.
NATURE COMMUNICATIONS
(2021)
Article
Engineering, Electrical & Electronic
Keyu Liu, Xiaoyan Tang, Hao Yuan, Qingwen Song, Yancong Liu, Yu Zhou, Fengyu Du, Yuming Zhang
Summary: The radiation tolerance of the 4H-silicon carbide (SiC) junction barrier Schottky with field limiting rings (FLRs-JBS) termination was evaluated for single-event burnout (SEB). It was found that the SiC/SiO2/metal intersection in the FLRs-JBS was the most sensitive position. This study proposed different mechanisms between the active and terminal regions under heavy-ion irradiation for the first time. Simulation results demonstrated that the FLRs terminal area was more susceptible to burnout under single-event irradiation due to the current crowding effect.
IEEE TRANSACTIONS ON ELECTRON DEVICES
(2023)
Article
Chemistry, Multidisciplinary
Jing-Wei Yang, Tzu-Yu Peng, Daniel D. A. Clarke, Frank Daniel Bello, Jia-Wern Chen, Hao-Chen Yeh, Wei-Ren Syong, Chi-Te Liang, Ortwin Hess, Yu-Jung Lu
Summary: Researchers have developed a novel system that integrates superconducting wire photon detectors with gap-plasmon resonators, improving the performance of single-photon detectors. The system achieves 98% photon detection efficiency for visible light while preserving polarization insensitivity and other features. These findings open up new opportunities for ultrasensitive single-photon detection in areas like quantum information processing, quantum optics, imaging, and sensing at visible wavelengths.
Article
Engineering, Chemical
Zhen Tan, Libin Zhang, Zhonghua Yu
Summary: The complex electrification mechanism during particle fluidization requires a reliable contact electrification model that addresses issues such as charging efficiency and the critical gap for electron tunnelling. This study develops a contact electrification model based on the condenser model, focusing on the simplest normal contact electrification between insulator particles and metal surfaces. By analyzing the impact of initial charge and impact velocity on transferred charge, the model accurately predicts electrification during the collision of insulator particles on metal surfaces. Experimental validation demonstrates the effectiveness of the model.
Article
Engineering, Electrical & Electronic
Sheng Gao, Yi Huang, Hongsheng Zhang, Hong Yang, Bin Liu
Summary: This study presents a novel method for fabricating Schottky/ohmic drain for GaN HEMTs, which enables the production of Schottky/ohmic drain without the need for secondary photolithography or metal evaporation steps. By adjusting the direction of the electron beam evaporation, different metal/semiconductor interfaces can be formed simultaneously, enhancing the shielding effect of the rough ohmic-drain metal morphology and modulating the electric field distribution on the drain side. The use of Schottky/ohmic drain technology improves the breakdown voltage and enhances the offstate reliability characteristics of GaN HEMTs.
IEEE ELECTRON DEVICE LETTERS
(2022)
Article
Multidisciplinary Sciences
A. Guthrie, S. Kafanov, M. T. Noble, Yu A. Pashkin, G. R. Pickett, V Tsepelin, A. A. Dorofeev, V. A. Krupenin, D. E. Presnov
Summary: Researchers have successfully demonstrated real-time detection of single quantum vortices in superfluid He-4 at 10 millikelvin using nanoscale resonant beams. By controlling the vortex density in the environment, they observed the processes of vortex capture and release.
NATURE COMMUNICATIONS
(2021)
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
Physics, Applied
J. M. A. Chawner, S. Barraud, M. F. Gonzalez-Zalba, S. Holt, E. A. Laird, Yu A. Pashkin, J. R. Prance
Summary: A cryogenic quantum dot thermometer is calibrated and operated using a single nongalvanic gate connection, with the ability to measure electron temperatures between 1.0 K and 3.0 K. The thermometer can operate outside the calibration temperature range, with a sensitivity of 4.0 +/- 0.3 mK/√Hz.
PHYSICAL REVIEW APPLIED
(2021)
Article
Chemistry, Multidisciplinary
Joshoua Condicion Esmenda, Myrron Albert Callera Aguila, Jyh-Yang Wang, Teik-Hui Lee, Chi-Yuan Yang, Kung-Hsuan Lin, Kuei-Shu Chang-Liao, Nadav Katz, Sergey Kafanov, Yuri A. Pashkin, Chii-Dong Chen
Summary: Observing resonance modes and modal responses at frequencies in between resonances can provide a deeper understanding of mechanical motion. The spatial distribution of the oscillating component of the driving force, influenced by electrode shape and device properties, greatly affects modal weight. Modal superposition analysis elucidates the dynamics of any nanomechanical system through modal weights, aiding in optimizing mode-specific designs for force sensing and integration with other systems.
Article
Physics, Applied
A. Kemppinen, A. Ronzani, E. Mykkanen, J. Hatinen, J. S. Lehtinen, M. Prunnila
Summary: This paper demonstrates highly transparent silicon-vanadium and silicon-aluminum tunnel junctions with low sub-gap leakage current and discusses the trade-off between transparency and leakage on their refrigeration performance. Theoretical investigation of cascaded superconducting tunnel junction refrigerators with multiple stages is conducted, with the development of an approximate method to optimize the cascade one stage at a time. The design of an energy-efficient cascade system allows for cooling of quantum devices from above 1K to below 100 mK, making it a feasible experimental target.
APPLIED PHYSICS LETTERS
(2021)
Article
Physics, Applied
J. Nissila, T. Fordell, K. Kohopaa, E. Mykkanen, P. Immonen, R. N. Jabdaraghi, E. Bardalen, O. Kieler, B. Karlsen, P. A. Ohlckers, R. Behr, A. J. Manninen, J. Govenius, A. Kemppinen
Summary: The researchers conducted proof-of-concept experiments on an optically driven Josephson voltage standard, observing qualitative agreement with theoretical simulations but also quantitative discrepancies. In the future, they plan to improve the integration of photodiodes and Josephson junction arrays to enhance the performance of Josephson Arbitrary Waveform Synthesizers.
APPLIED PHYSICS LETTERS
(2021)
Article
Chemistry, Multidisciplinary
Myrron Albert Callera Aguila, Joshoua Condicion Esmenda, Jyh-Yang Wang, Teik-Hui Lee, Chi-Yuan Yang, Kung-Hsuan Lin, Kuei-Shu Chang-Liao, Sergey Kafanov, Yuri A. Pashkin, Chii-Dong Chen
Summary: This study addresses the challenges of characterizing dynamic properties of nanomechanical resonators made from van der Waals materials in optoelectromechanical technologies. A modeling-based approach using multilayer thin-film interference allows for non-invasive determination of resonator properties. The method is demonstrated to be robust and scalable, applicable to various types of nanomechanical resonators.
NANOSCALE ADVANCES
(2022)
Article
Chemistry, Multidisciplinary
Myrron Albert Callera Aguila, Joshoua Condicion Esmenda, Jyh-Yang Wang, Yen-Chun Chen, Teik-Hui Lee, Chi-Yuan Yang, Kung-Hsuan Lin, Kuei-Shu Chang-Liao, Sergey Kafanov, Yuri A. Pashkin, Chii-Dong Chen
Summary: This study addresses the knowledge gap regarding the dependence of photothermal response on nanomechanical resonator displacement. By studying electromotively driven niobium diselenide drumheads, the researchers explain the measured variations of the photothermal response using a Fabry-Perot-mediated absorptive heating model. The study establishes a displacement-based framework for building bolometers using FP-mediated vdW NMRs.
Article
Nanoscience & Nanotechnology
Joshoua Condicion Esmenda, Myrron Albert Callera Aguila, Jyh-Yang Wang, Teik-Hui Lee, Yen-Chun Chen, Chi-Yuan Yang, Kung-Hsuan Lin, Kuei-Shu Chang-Liao, Sergey Kafanov, Yuri Pashkin, Chii-Dong Chen
Summary: Studies on nanomechanical motion have evolved from understanding its fundamental aspects to practical applications, particularly in hybrid systems. Nanomechanical resonators play a crucial role as transducers in quantum communications interfaces. In this study, we argue that multilayered 2D nanomechanical resonators are a better fit for this role due to their electrostatic tunability and potential for larger optomechanical responsivity.
ACS APPLIED NANO MATERIALS
(2022)
Article
Physics, Applied
Marco Marin-Suarez, Yuri A. Pashkin, Joonas T. Peltonen, Jukka P. Pekola
Summary: This study demonstrates the generation of accurate single-electron currents under zero bias voltage. By applying periodic modulation to the source electrode, single-electron tunneling can be achieved, and the current direction can be reversed by changing the phase.
JOURNAL OF LOW TEMPERATURE PHYSICS
(2023)
Article
Physics, Multidisciplinary
Hyunsik Im, Dong Uk Lee, Yongcheol Jo, Jongmin Kim, Yonuk Chong, Woon Song, Hyungsang Kim, Eun Kyu Kim, Taewon Yuk, Sang-Jin Sin, Soonjae Moon, Jonathan R. Prance, Yuri A. Pashkin, Jaw-Shen Tsai
Summary: Doping silicon with phosphorus and introducing localized magnetic moments results in a correlated electronic ground state known as Kondo condensation. By conducting electrical transport and density-of-states spectroscopy measurements, we detect the Kondo effect and observe an unusual pseudogap in the resistivity and density of states of the highly P-doped silicon metal. These observations provide evidence of Kondo condensation followed by a transition to a disordered Fermi liquid phase.
