Article
Multidisciplinary Sciences
Olukunle C. Olawole, Dilip K. De, Sunday O. Oyedepo, Fabian Ezema
Summary: In this study, five mathematical models were compared for predicting the emission current density of graphene-based thermionic energy converters, with the Modified Richardson Dushman model (MRDE) found to be the most suitable. The MRDE model is dependent on temperature, Fermi energy, work function, and coefficient of thermal expansion.
SCIENTIFIC REPORTS
(2021)
Article
Physics, Multidisciplinary
Peter Udvarhelyi, Balint Somogyi, Gergo Thiering, Adam Gali
Summary: The exact microscopic structure of the G photoluminescence center in silicon is identified through first-principles calculations, revealing that the observed fine structure of its optical signals originates from the athermal rotational reorientation of the defect. Additionally, the thermally activated motional averaging of the defect properties and the nature of the qubit state are discussed.
PHYSICAL REVIEW LETTERS
(2021)
Article
Physics, Multidisciplinary
Giuseppe Buonaiuto, Federico Carollo, Beatriz Olmos, Igor Lesanovsky
Summary: This study investigates the creation and control of emergent collective behavior and quantum correlations using feedback in an emitter-waveguide system. It shows the emergence of a time-crystal phase and the control of many-body quantum correlations through feedback strength. The largely analytical results quantify spin squeezing and fluctuations, revealing critical scaling close to the transition to the time crystal.
PHYSICAL REVIEW LETTERS
(2021)
Article
Materials Science, Multidisciplinary
Fan Li, Tianhang Meng, Zhongxi Ning, Chenying Li, Ao Han, Yingting Li, Daren Yu
Summary: The study presented a novel emitter structure with an inserted core for low-current hollow cathodes, which significantly reduced discharge power consumption and improved efficiency. However, further optimization is required for the location and length of the core to enhance its lifetime.
Article
Physics, Multidisciplinary
Lorenzo De Santis, Matthew E. Trusheim, Kevin C. Chen, Dirk R. Englund
Summary: This study experimentally quantifies the electric field dependence of individual tin-vacancy (SnV) centers in diamond and shows that their permanent electric dipole moment and polarizability are at least 4 orders of magnitude smaller than for the diamond nitrogen vacancy (NV) centers. Additionally, the researchers demonstrate that by modulating the electric-field-induced dipole, SnV can be used as a nanoscale probe of local electric field noise, highlighting the effect of spectral diffusion on SnV.
PHYSICAL REVIEW LETTERS
(2021)
Article
Physics, Multidisciplinary
C. Gauvin-Ndiaye, M. Setrakian, A-M S. Tremblay
Summary: Near the antiferromagnetic quantum critical point (QCP) of electron-doped cuprate superconductors, hot spots where the Fermi surface disappears have been detected through angle-resolved photoemission experiments. Using the two-particle self-consistent theory, it is demonstrated that the Fermi liquid remains stable for a broad range of angles on the Fermi surface and for all dopings near the QCP in the antinodal region. The study shows how the quasiparticle weight Z and effective mass m* change and become meaningless as the hot spots are approached.
PHYSICAL REVIEW LETTERS
(2022)
Article
Materials Science, Multidisciplinary
Luka Hansen, Niklas Kohlmann, Lorenz Kienle, Holger Kersten
Summary: A custom-built atmospheric pressure direct current microplasma discharge was designed using Au coated Si3N4 transmission electron microscopy grids as electrodes for direct imaging of the plasma treated surfaces. Significant differences were observed between the anode and cathode, as well as between Ar or He operation of the microplasma, from examination of the electrode surfaces using light microscopy. Scanning electron microscopy and TEM imaging provided details of grain growth and changes in surface morphology, revealing the effects of energy fluxes and ions on surface modifications.
Article
Chemistry, Inorganic & Nuclear
Mark Sims, Sotiris Kyriakou, Aidan Matthews, Michael E. E. Deary, Valery N. N. Kozhevnikov
Summary: It has been discovered in this study that the coordination of Re(i) to a 1,2,4-triazine ring can significantly accelerate the reaction rate with bicyclooctyne (BCN) by a factor of 55. Comparative analysis with corresponding 1,2,4,5-tetrazine analogues showed that the increased reactivity of triazine is more profound and different than tetrazines, which can be attributed to its lower distortion energy, more favorable interaction energy, and lower Pauli repulsion.
DALTON TRANSACTIONS
(2023)
Article
Engineering, Electrical & Electronic
Johannes Bergur Gunnarsson, Kristinn Torfason, Andrei Manolescu, Agust Valfells
Summary: This study numerically simulates the classical charge dynamics in a microscopic planar vacuum diode with a finite emitter area and a finite number of electrons in the gap. The results are compared to the conventional 2-D Child-Langmuir and explain its limitations for submicrometer diameter emitters. Some simple relations are offered to understand space-charge limited flow from very small emitters.
IEEE TRANSACTIONS ON ELECTRON DEVICES
(2021)
Review
Physics, Applied
Kamatchi Jothiramalingam Sankaran, Joji Kurian, Balakrishnan Sundaravel, I-Nan Lin, Ken Haenen
Summary: This study focuses on the enhancement of electrical conductivity and field electron emission properties of ultrananocrystalline diamond films via gold ion implantation, and the comparison of characteristics of different implanted species. Additionally, the use of a thin gold coating on silicon substrates covered by diamond films is discussed for improved emission characteristics.
JOURNAL OF PHYSICS D-APPLIED PHYSICS
(2021)
Article
Engineering, Electrical & Electronic
E. Taradaev, G. Sominskii
Summary: The characteristics of annular electron flow formed in an electron gun with a multitip field emitter were determined experimentally and numerically, and the potential to achieve a high electron beam current was demonstrated. The gun performance remained stable under vacuum conditions, with the velocity distributions of the electron flow varying in both transverse and longitudinal components.
IEEE TRANSACTIONS ON ELECTRON DEVICES
(2022)
Article
Materials Science, Multidisciplinary
Wei Fu, Sha-Sha Ke, Yong Guo, Huai-Wu Zhang, Hai-Feng Lu
Summary: We studied the electron transport and waiting time distribution in a topological superconducting Coulomb island system weakly coupled to two metallic leads. We found that super-Poissonian shot noise could be induced when the Majorana energy splitting is larger than the charging energy, due to the lifting of degeneracy of ground states by a finite Majorana energy splitting. The behaviors of waiting time distributions in a Majorana island device can help identify the existence of Majorana bound states.
Article
Engineering, Electrical & Electronic
Deyi Huang, Yicong Chen, Chengyun Wang, Juncong She, Shaozhi Deng, Jun Chen
Summary: The study investigates the influence of controlled saturation current on the response speed of MOSFET-controlled FEAs, finding that the response speed decreases nearly linearly as the saturation current decreases. A solution is proposed using a controlled current larger than the induced current during the charging process and can rapidly reduce to the field emission current to balance stability and response speed.
IEEE TRANSACTIONS ON ELECTRON DEVICES
(2022)
Article
Engineering, Electrical & Electronic
Jiupeng Li, Yu Zhang, Yanlin Ke, Baohong Li, Shaozhi Deng
Summary: This paper reports on a convex carbon nanotube (CNT) emitter cathode that improves the focus and laminar flow of the electron beam for a cold cathode gun, leading to better distribution uniformity. Compared with the planar CNT emitter cathode, the convex emitter cathode demonstrates better uniformity and compatibility on the quality control of the electron beam.
IEEE TRANSACTIONS ON ELECTRON DEVICES
(2022)
Article
Materials Science, Multidisciplinary
P. Lochner, J. Kerski, A. Kurzmann, A. D. Wieck, A. Ludwig, M. Geller, A. Lorke
Summary: The study demonstrates an internal photoeffect in a single self-assembled quantum dot by time-resolved resonance fluorescence measurements, showing a linear dependence of the emission rate on the excitation intensity. The emission rate can be tuned over several orders of magnitude by adjusting the excitation intensity. The findings reveal a process similar to photoionization in solid-state, which may fundamentally limit the coherence times in solid-state quantum optical devices.
Article
Materials Science, Multidisciplinary
R. Le Goff, M. Rosticher, Y. Peng, Z. Liu, T. Taniguchi, K. Watanabe, J-M Berroir, E. Bocquillon, G. Feve, C. Voisin, J. Chazelas, B. Placais, E. Baudin
Summary: Group-10 transition-metal dichalcogenides show promise for ultra-broadband infrared detection. The investigation of PdSe2 n-MOSFETs reveals surface channel inversion-depletion-accumulation behaviors, high mobility, and a narrow bulk bandgap. These devices have a competitive electronic cut-off frequency in the GHz range, making them suitable for fast IR detection in the 1-10 μm range.
Article
Materials Science, Multidisciplinary
A. Pierret, D. Mele, H. Graef, J. Palomo, T. Taniguchi, K. Watanabe, Y. Li, B. Toury, C. Journet, P. Steyer, V Garnier, A. Loiseau, J-M Berroir, E. Bocquillon, G. Feve, C. Voisin, E. Baudin, M. Rosticher, B. Placais
Summary: This study aims to refine the dielectric characterization of hexagonal boron nitride (hBN) in terms of low-field permittivity and high-field strength and conductivity. The results show that hBN has a low-field dielectric constant of around 3.4 and follows the Frenkel-Pool law for current leakage at high-field, with similar dielectric constant and trap energy as standard technologically relevant dielectrics.
MATERIALS RESEARCH EXPRESS
(2022)
Article
Multidisciplinary Sciences
I Taktak, M. Kapfer, J. Nath, P. Roulleau, M. Acciai, J. Splettstoesser, I Farrer, D. A. Ritchie, D. C. Glattli
Summary: In this study, a novel interferometric approach was used to demonstrate that anyons maintain quantum coherence while propagating. The results have positive implications for achieving controlled quantum coherent braiding of anyons.
NATURE COMMUNICATIONS
(2022)
Article
Multidisciplinary Sciences
M. Jo, June-Young M. Lee, A. Assouline, P. Brasseur, K. Watanabe, T. Taniguchi, P. Roche, D. C. Glattli, N. Kumada, F. D. Parmentier, H-S Sim, P. Roulleau
Summary: Efforts have been made to understand and control decoherence in 2D electron systems, with graphene offering a unique opportunity to study unexplored regimes of electron interferometry. A graphene quantum Hall PN junction exhibits a remarkable crossover from exponential decay to algebraic decay of interference visibility as temperature decreases, a previously unobserved phenomenon in GaAs interferometers.
NATURE COMMUNICATIONS
(2022)
Article
Physics, Multidisciplinary
A. Schmitt, P. Vallet, D. Mele, M. Rosticher, T. Taniguchi, K. Watanabe, E. Bocquillon, G. Feve, J. M. Berroir, C. Voisin, J. Cayssol, M. O. Goerbig, J. Troost, E. Baudin, B. Placais
Summary: Researchers have achieved a mesoscopic variant of the Schwinger effect in graphene transistors, which involves the creation of matter by electric fields. By conducting transport measurements, they observed universal one-dimensional Schwinger conductance at the pinch-off of the transistors. These findings enhance our understanding of current saturation limits in ballistic graphene and open up new directions for quantum electrodynamic experiments in the laboratory.
Article
Physics, Multidisciplinary
H. Bartolomei, R. Bisognin, H. Kamata, J. -M. Berroir, E. Bocquillon, G. Menard, B. Placais, A. Cavanna, U. Gennser, Y. Jin, P. Degiovanni, C. Mora, G. Feve
Summary: This paper reports on the squeezing of bosonic edge magnetoplasmon modes in a quantum Hall conductor, whose characteristic impedance is determined by the quantum of resistance (RK 25 kS2), offering the possibility of enhanced coupling to low-dimensional quantum conductors. By applying a combination of dc and ac drives to a quantum point contact, squeezing is demonstrated and a noise reduction of 18% below vacuum fluctuations is observed, indicating the achievement of squeezing in a low impedance environment. The level of squeezing can be improved by using more complex conductors, such as ac driven quantum dots or mesoscopic capacitors.
PHYSICAL REVIEW LETTERS
(2023)
Article
Physics, Multidisciplinary
M. Ruelle, E. Frigerio, J. -M. Berroir, B. Placais, J. Rech, A. Cavanna, U. Gennser, Y. Jin, G. Feve
Summary: Recent anyon collision experiments have shown the ability to distinguish between fermionic and anyonic statistics. However, only one type of anyons associated with the Laughlin state at filling factor nu = 1/3 has been studied so far. It is important to establish anyon collisions as quantitative probes for more complex topological orders and different species of anyons. In this study, we compare the Laughlin nu = 1/3 state with the Jain nu = 2/5 state, and demonstrate the robustness of anyon collision signals for anyons of the same type while also showing the ability to distinguish between different species of anyons. Our results indicate the influence of interchannel interactions in anyon collision experiments with multiple edge channels.
Article
Materials Science, Multidisciplinary
A. Schmitt, D. Mele, M. Rosticher, T. Taniguchi, K. Watanabe, C. Maestre, C. Journet, V. Garnier, G. Feve, J. M. Berroir, C. Voisin, B. Placais, E. Baudin
Article
Materials Science, Multidisciplinary
Matteo Acciai, Preden Roulleau, Imen Taktak, D. Christian Glattli, Janine Splettstoesser
Summary: This article investigates an electronic Hong-Ou-Mandel interferometer in the integer quantum Hall regime, where voltage pulses are used to generate colliding electronic states. The aim is to explore possible mechanisms that lead to a reduced visibility of the Pauli dip, which is the expected noise suppression for synchronized sources. It is found that the mixing of copropagating edge channels due to tunneling events between them can result in a reduced visibility of the Pauli dip.
Article
Quantum Science & Technology
B. Roussel, C. Cabart, G. Feve, P. Degiovanni
Summary: Recent developments in coherent manipulation of electrons in ballistic conductors have led to the generation of time-periodic electrical currents involving one to few electronic excitations per period. In order to utilize individual electrons as carriers of quantum information for flying qubit computation or quantum metrology applications, a general method is needed to unravel the single-particle excitations embedded in a quantum electrical current and how quantum information is encoded within it.
