Article
Physics, Multidisciplinary
Massimiliano Lucci, Davide Cassi, Vittorio Merlo, Roberto Russo, Gaetano Salina, Matteo Cirillo
Summary: Evidence suggests that topological effects in graph-shaped arrays of superconducting islands can influence superconducting energy gap and transition temperature. The new phase is generated by pairs of electrons (Cooper pairs) behaving as bosons in the superconducting state. The coupling between the islands is provided by Josephson junctions, and the distribution on the islands is probed by a unique technique that allows for boson hopping between the islands.
Article
Multidisciplinary Sciences
Filipa R. Prudencio, Mario G. Silveirinha
Summary: Photonic topological materials with broken time-reversal symmetry exhibit nontrivial topological phases, supporting edge-state propagation when enclosed by specific boundaries. The Haldane model revealed the importance of broken time-reversal symmetry for quantized electronic Hall phase. In photonics, the Haldane model's magnetic field can be mimicked using a spatially varying pseudo-Tellegen coupling, leading to nontrivial phase transitions controlled by the amplitude of the pseudo-Tellegen parameter in photonic crystals.
Article
Chemistry, Multidisciplinary
Yunpeng Wu, Yi Feng, Zhongyu He, Deyang Yu, Ying Xue, Xilong Liu, Leiyun Han, Xudong Zhao, Xiaoyang Liu
Summary: This study utilized a hydrothermal approach to integrate graphene oxide, acetic acid, and nickel foam to prepare hydrogenated graphene. The research focused on determining the structure and ferromagnetism of the hydrogenated graphene, offering a novel route for its synthesis and potential application in spin electronic devices.
CHINESE CHEMICAL LETTERS
(2021)
Article
Chemistry, Multidisciplinary
P. Panigrahi, Y. Pal, D. Raval, S. K. Gupta, P. N. Gajjar, H. Bae, H. Lee, S. Mark, R. Ahuja, R. Pandey, T. Hussain
Summary: This study investigates the effects of selected transition metal dichalcogenide monolayers on toxic sulfur-containing gases H2S and SO2 and enhances their adsorption capability by doping specific elements. The findings demonstrate that doped MoX2 has an efficient sensing mechanism and can be used to synthesize highly sensitive and selective nanosensors for H2S/SO2.
MATERIALS TODAY CHEMISTRY
(2022)
Article
Mathematics, Applied
Wen-ming He, Hailong Guo
Summary: This study investigates the maximum norm error estimations for virtual element methods, establishing higher local regularity and optimal convergence results through analysis of Green's functions and high-order local error estimations for the virtual element solutions. The theoretical discoveries are validated with a numerical example on general polygonal meshes.
SIAM JOURNAL ON NUMERICAL ANALYSIS
(2022)
Article
Materials Science, Multidisciplinary
Alexander Mook, Sebastian A. Diaz, Jelena Klinovaja, Daniel Loss
Summary: The study reveals a second-order TMI state in three-dimensional ferromagnets, characterized by excitations at the hinges, and shows the possibility of tunability through atomic-level engineering for robust topological protection. The findings empower magnonics with higher-order topology tools, offering a promising route for low-energy information transfer with three-dimensional vertical integration.
Article
Chemistry, Multidisciplinary
Guy L. Kabongo, Gugu H. Mhlongo, Mokhotjwa S. Dhlamini
Summary: The research successfully synthesized ZnO nanostructures doped with Holmium, observing changes in morphology and luminescence properties. Reduced surface defects were found in the doped samples through XPS analysis, and enhanced room temperature ferromagnetism correlated with UV-VIS transmittance results was detected in Ho3+-doped ZnO samples.
Article
Chemistry, Multidisciplinary
Yueshen Wu, Yuxiong Hu, Cong Wang, Xiang Zhou, Xiaofei Hou, Wei Xia, Yiwen Zhang, Jinghui Wang, Yifan Ding, Jiadian He, Peng Dong, Song Bao, Jinsheng Wen, Yanfeng Guo, Kenji Watanabe, Takashi Taniguchi, Wei Ji, Zhu-Jun Wang, Jun Li
Summary: This study examines the atomic structure of Fe3GeTe2 crystals with varying Curie temperature (T-c) values. It is found that high-T-c samples (210 and 230 K) have Fe-intercalation within the van der Waals gap, which leads to an exchange bias effect observed in electrical transport measurements. The absence of Fe intercalation or bias effect in low-T-c samples (160 K) is also noted. First-principles calculations suggest that the Fe-intercalation layer contributes to the local antiferromagnetic coupling and enhancement of T-c through interlayer exchange paths.
ADVANCED MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Xiaocang Han, Jing-Yang You, Shengqiang Wu, Runlai Li, Yuan Ping Feng, Kian Ping Loh, Xiaoxu Zhao
Summary: Transition-metal trihalides MX3 belong to a family of novel 2D magnets with topological magnons and electromagnetic properties, showing great potential in next-generation spintronic devices. However, direct atomic-scale analysis of MX3 is challenging due to their air instability, making information on stacking-registry-dependent magnetism elusive. In this study, we report a nondestructive transfer method to realize intact transfer of bilayer MX3 and provide a full spectrum of stacking orders in MX3 with atomic precision, revealing their associated magnetic ground states. The study sheds light on the structural basis of diverse magnetic orders in MX3, paving the way for modulating magnetic couplings via stacking engineering.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2023)
Article
Materials Science, Multidisciplinary
Uma Bharti, Pramod Kumar Vaishnav
Summary: This study investigates the propagation of Love waves in smart materials and its potential applications in seismic acoustic wave devices. The sinusoidal diversity in piezomagnetic materials under an impulsive point source is considered to reveal the hidden characteristics of Love wave behavior. It is found that the functional gradient parameters and piezomagnetic constants significantly affect the phase velocity of Love waves.
MECHANICS OF ADVANCED MATERIALS AND STRUCTURES
(2023)
Article
Multidisciplinary Sciences
Zhongyi Zhang, Shengshan Qin, Jiadong Zang, Chen Fang, Jiangping Hu, Fu-Chun Zhang
Summary: The presence of Dzyaloshinskii-Moriya (DM) interaction in limited noncentrosymmetric materials leads to unique spin textures and exotic chiral physics. The emergence of DM interaction in centrosymmetric crystals has the potential to greatly enhance material realization. In this study, we demonstrate that an itinerant centrosymmetric crystal respecting a nonsymmorphic space group can serve as a new platform for the DM interaction. Our findings reveal the role of nonsymmorphic symmetries in influencing magnetism and suggest that nonsymmorphic crystals can be promising platforms for designing magnetic interactions.
Article
Chemistry, Multidisciplinary
Youngkyu Hwang, Anupam Sadhu, Sangho Shin, Shin Woei Leow, Ze Zhao, Jingyu Deng, Joshua A. Jackman, Munho Kim, Lydia H. Wong, Nam-Joon Cho
Summary: This study reports the fabrication of a flexible substrate made from pollen, which exhibits high transparency (>92%) and high haze (>84%), with optical properties that are tunable and arise from light-matter interactions with the spiky surface of pollen particles. The pollen substrate, readily obtained from nature and requiring minimal extraction or processing, can be incorporated into optoelectronic applications such as functional perovskite solar cells.
ADVANCED MATERIALS
(2021)
Article
Chemistry, Physical
Dmitry V. Averyanov, Ivan S. Sokolov, Alexander N. Taldenkov, Oleg E. Parfenov, Igor A. Karateev, Oleg A. Kondratev, Andrey M. Tokmachev, Vyacheslav G. Storchak
Summary: 2D magnets have the potential to exhibit unconventional phases and related phenomena. The key advantage of 2D magnetism lies in its susceptibility to external stimuli and structural variations. The low dimensionality allows for competition between magnetic orders, which can lead to the emergence of exchange bias, particularly in magnetic heterostructures. In this study, the authors propose a strategy for investigating the exchange bias state in 2D individual compounds. They track the evolution of magnetic orders as a function of the number of monolayers in a system that exhibits antiferromagnetism in the multilayer limit and ferromagnetism in the monolayer limit. The material studied, EuSi2, consists of multilayer silicene intercalated by Eu and shows a strong intrinsic exchange bias effect during the dimensional crossover. Comparison with other similar materials suggests that the competition between magnetic orders is a common property in this material class, which could be useful for spintronic applications.
NANOSCALE HORIZONS
(2023)
Article
Chemistry, Multidisciplinary
Asbjorn Ulvestad, Marte O. Skare, Carl Erik Foss, Henrik Krogsaeter, Jakob F. Reichstein, Thomas J. Preston, Jan Petter Mathlen, Hanne F. Andersen, Alexey Y. Koposov
Summary: Amorphous substoichiometric silicon nitride (SiNx) as a convertible anode material for Li-based batteries overcomes stability challenges associated with common alloying materials, delivering high capacity and cycling stability over 1000 charge/discharge cycles.
Review
Physics, Condensed Matter
S. L. Prischepa, V. N. Kushnir
Summary: This article discusses various aspects of phonon spectrum changes in nanostructured phonon-mediated superconductors. With the development of experimental techniques and the acquisition of new results, the understanding of the influence of surface and nanoscale on the electron-phonon interaction and critical temperature T (c) has changed and deepened. The article is divided into ten parts, discussing superconductivity theory, properties of nanostructured thin films, phonon spectrum modifications, and light excitation of superconducting materials, among others.
JOURNAL OF PHYSICS-CONDENSED MATTER
(2023)
Article
Music
Audrey Cottet
Summary: This article presents a study on finger cymbals used by Roman dancers, providing evidence that they used similar finger cymbals to those used by Middle Eastern dancers.
Article
Physics, Multidisciplinary
E. Gumus, D. Majidi, D. Nikolic, P. Raif, B. Karimi, J. T. Peltonen, E. Scheer, J. P. Pekola, H. Courtois, W. Belzig, C. B. Winkelmann
Summary: Josephson junctions play a central role in superconducting quantum technology, and irreversibility arises from sudden slips of the quantum phase difference across the junction. By detecting the instantaneous heat release caused by a phase slip, this study provides insights into the ubiquity of dissipation in quantum devices, particularly in superconducting quantum sensors and qubits. This advancement in experimental quantum thermodynamics allows for the observation of heat in elementary quantum processes.
Article
Physics, Multidisciplinary
D. Z. Haxell, E. Cheah, F. Krizek, R. Schott, M. F. Ritter, M. Hinderling, W. Belzig, C. Bruder, W. Wegscheider, H. Riel, F. Nichele
Summary: We experimentally investigate the stochastic phase dynamics of planar Josephson junctions (JJs) and superconducting quantum interference devices (SQUIDs) defined in epitaxial InAs/Al heterostructures, and characterized by a large ratio of Josephson energy to charging energy. We observe a crossover from a regime of macroscopic quantum tunneling to one of phase diffusion as a function of temperature, where the transition temperature T* is gate-tunable.
PHYSICAL REVIEW LETTERS
(2023)
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
Physics, Applied
M. Huebler, W. Belzig
Summary: Quantum transport in the presence of time-dependent drives is dominated by quantum interference and many-body effects at low temperatures. For a periodic driving, the analysis of the full counting statistics revealed the elementary events that determine the statistical properties of the charge transport. However, recent studies have focused on transport by few-cycle light pulses and the need for a statistical interpretation has become evident.
APPLIED PHYSICS LETTERS
(2023)
Article
Materials Science, Multidisciplinary
M. Huebler, W. Belzig
Summary: The scattering picture of electron transport in mesoscopic conductors reveals that fluctuations of the current provide additional information on the scattering mechanism. The fluctuations are coupled to the electromagnetic field, and the emission and absorption spectrum is characterized by current-current correlators. Recent research focuses on the delta-T noise, which is caused by temperature difference between terminals. This study extends the concept of delta-T noise to the nonsymmetrized current-current correlator at finite frequencies, and examines the spectral density for different scattering scenarios.
Article
Materials Science, Multidisciplinary
Panch Ram, Detlef Beckmann, Romain Danneau, Wolfgang Belzig
Summary: In this study, we investigate the changes in Andreev and normal reflection processes by applying a displacement field in a bilayer graphene-superconductor junction. The reflection probabilities were calculated under different conditions, and it was found that the reflection mode can be adjusted by tuning the Fermi energy. The transition from retro to specular reflection is amplified when the displacement field is relatively small. Furthermore, we discovered the simultaneous existence of double Andreev reflections and double normal reflections when the displacement field is comparable to the interlayer coupling strength.
Article
Materials Science, Multidisciplinary
Danilo Nikolic, Bayan Karimi, Diego Subero Rengel, Jukka P. Pekola, Wolfgang Belzig
Summary: A mesoscopic thermometer for ultrasensitive detection based on the proximity effect in superconductor-normal metal (SN) heterostructures is proposed. The thermometer utilizes the zero-bias anomaly caused by inelastic Cooper-pair tunneling in an SNIS junction coupled to an ohmic electromagnetic environment. A simplified analytic treatment is also proposed, which agrees well with numerical results and can be used for the development, calibration, and optimization of such devices in future experiments.
Article
Materials Science, Multidisciplinary
J. Reutlinger, L. Glazman, Yu. V. Nazarov, W. Belzig
Summary: This study numerically investigates and analyzes mesoscopic fluctuations of secondary gaps in the quasiclassical spectrum of a chaotic cavity coupled to superconductors using a random matrix model. The distribution of the gap widths is found to be determined by an intermediate energy scale Delta(g), and the scaled distribution in a specific regime is found to be consistent with previous research findings.
Article
Materials Science, Multidisciplinary
Irina V. Bobkova, Alexander M. Bobkov, Akashdeep Kamra, Wolfgang Belzig
Summary: In this study, we theoretically demonstrate the existence of magnons with nonzero wavenumbers, which can induce a cloud of spinful triplet Cooper pairs in an adjacent conventional superconductor. This resulting composite quasiparticle, known as the magnon-cooparon, possesses a large effective mass and can be measured experimentally. Additionally, we discover that two magnetic wires deposited on a superconductor can act as a controllable magnonic directional coupler, mediated by the nonlocal and composite nature of the magnon-cooparons.
COMMUNICATIONS MATERIALS
(2022)
Article
Materials Science, Multidisciplinary
Jonathan L. Wise, Nathan Roubinowitz, Wolfgang Belzig, Denis M. Basko
Summary: The noise spectrum of heat current can directly probe the heat-carrying excitations, and our predictions are verified in realistic superconducting circuits and two-dimensional metals. The Landauer-type description for radiative heat transfer breaks down on the level of the noise, while it holds for the average.
Article
Materials Science, Multidisciplinary
D. Maile, J. Ankerhold, S. Andergassen, W. Belzig, G. Rastelli
Summary: We theoretically investigate the escape rate occurring via quantum tunneling in a system affected by tailored dissipation. We find that the charge dissipation leads to an enhancement of the quantum escape rate, even in the presence of phase dissipation.
Article
Materials Science, Multidisciplinary
Felicitas Hellbach, Fabian Pauly, Wolfgang Belzig, Gianluca Rastelli
Summary: By studying a parallel double quantum dot device, we investigate the quantum correlation and entanglement generated between two separated cavities by the coherent transport of a single electron passing through different dots. We analyze the interaction between high-quality microwave cavities and quantum dots, revealing some cooperative effects between light and matter.
Article
Astronomy & Astrophysics
Adam Bednorz, Wolfgang Belzig
Summary: This article discusses the influence of vacuum fluctuations on the measurement signal of the smallest quantum objects, suggesting a fundamental limitation to measurement accuracy. However, the author shows that relativistic invariance leads to the disappearance of fluctuations for the spacelike spectrum of an observable at zero temperature. By utilizing the self-interference of counterpropagating paths in a triangular Sagnac interferometer, the author outlines a general scheme for noiseless measurement of single particles.
Article
Materials Science, Multidisciplinary
D. Wuhrer, N. Rohling, W. Belzig
Summary: Recently, investigations have found that the quantum properties of an antiferromagnet in the spin wave approximation can be described by two-mode squeezed sublattice-magnon states. By studying the squeezing properties of all sublattice Fock states throughout the magnetic Brillouin zone, it has been shown that sublattice magnons occur in pairs with opposite wave vectors, resulting in entanglement of both modes. The degree of entanglement can be quantified using the Duan-Giedke-Cirac-Zoller inequality and decreases towards the corners of the Brillouin zone. The entanglement can be experimentally tested by measuring the correlations of components of the Neel and the magnetization vectors.