Article
Physics, Multidisciplinary
D. R. Rodrigues, A. Salimath, K. Everschor-Sitte, K. M. D. Hals
Summary: This study successfully manipulates domain walls in kagome antiferromagnets via a spin-wave source, with the speed and direction of the domain wall motion regulated by tuning the spin wave frequency. By establishing an effective action and deriving equations for spin-wave-driven domain wall motion, the frequency-dependent velocity of the spin texture is explained.
PHYSICAL REVIEW LETTERS
(2021)
Article
Chemistry, Physical
Satoshi Omori, Arata Ebihara, Keiko Hirano, Yuka Kasuga, Hayate Unno, Taro Nakatsukasa, Shunsuke Kimura, Keiichiro Maki, Takao Hanawa, Takashi Okiji
Summary: This study evaluated the influence of various rotational modes on the torque/force production and shaping ability of ProTaper Universal and ProTaper Gold nickel-titanium instruments. The results showed that R240/120 and OTR reduced the screw-in force in ProTaper Gold and improved the canal centering ability in ProTaper Universal.
Article
Chemistry, Physical
Banshi Das, Sergi Ruiz-Barragan, Dominik Marx
Summary: Based on computer simulations, we show that vibrational sum frequency generation (VSFG) spectroscopy can effectively distinguish between multilayer water in wide slit pores and bilayer/monolayer water in molecularly narrow pores, even with slight symmetry breaking. The different VSFG lineshapes of these water structures are attributed to their distinct density stratifications and resulting H-bonding patterns.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2023)
Article
Chemistry, Physical
Keiichiro Maki, Arata Ebihara, Hayate Unno, Satoshi Omori, Taro Nakatsukasa, Shunsuke Kimura, Takashi Okiji
Summary: This study examined how downward loads affect the torque/force and shaping outcome of ProTaper NEXT rotary instrumentation. The results showed that increasing the downward load improved the canal centering ability, reduced the instrumentation time, and increased the upward force.
Article
Dentistry, Oral Surgery & Medicine
Moe S. Kyaw, Arata Ebihara, Keiichiro Maki, Shunsuke Kimura, Taro Nakatsukasa, Pyae H. Htun, Myint Thu, Satoshi Omori, Takashi Okiji
Summary: Under laboratory conditions, the optimal glide path motion generated less clockwise torque and greater upward force compared to other rotation motions. The optimal glide path motion also resulted in fewer surface defects compared to continuous rotation. The three modes of reciprocal rotation better maintained the apical curvature of root canals than continuous rotation with the ProGlider instrument.
INTERNATIONAL ENDODONTIC JOURNAL
(2022)
Article
Chemistry, Multidisciplinary
Taro Nakatsukasa, Arata Ebihara, Moe Sandar Kyaw, Satoshi Omori, Hayate Unno, Shunsuke Kimura, Keiichiro Maki, Takashi Okiji
Summary: This study investigated the impact of a one-sided radial-landed cross-sectional design of a heat-treated nickel-titanium rotary instrument on torque/force generation and canal-shaping ability. The study found that this design resulted in smaller screw-in forces but similar canal-centering ability.
APPLIED SCIENCES-BASEL
(2022)
Article
Instruments & Instrumentation
Libo Zhou, Weihai Chen, Wenjie Chen, Shaoping Bai, Zheng Zhao, Jianhua Wang, Haoyong Yu
Summary: The study introduces user-defined variable stiffness in series elastic actuators (SEAs), which offer a larger force range and bandwidth compared to constant stiffness SEAs, while maintaining low output impedance and high force fidelity. However, SEAs exhibit obvious hysteresis effects and nonlinear torque curves related to amplitudes.
REVIEW OF SCIENTIFIC INSTRUMENTS
(2021)
Article
Multidisciplinary Sciences
Ye Tian, Jiani Hong, Duanyun Cao, Sifan You, Yizhi Song, Bowei Cheng, Zhichang Wang, Dong Guan, Xinmeng Liu, Zhengpu Zhao, Xin-Zheng Li, Li-Mei Xu, Jing Guo, Ji Chen, En-Ge Wang, Ying Jiang
Summary: The nature of hydrated proton on solid surfaces has been visualized using cryogenic qPlus-based atomic force microscopy. Eigen cations self-assemble into monolayer structures with local order, while Zundel cations form long-range ordered structures stabilized by nuclear quantum effects. It is found that Zundel configuration is preferred over Eigen on Pt(111), but such preference is absent on Au(111).
Article
Biophysics
Yujia Lv, Dawei Liang, Shanfu Lu, Doron Aurbach, Yan Xiang
Summary: This study demonstrates for the first time that bacteriorhodopsin is an n-type semiconductor and plays an important role in combined electrodes with p-n junction. Through photo-electrochemical methods, it was found that the self-corrosion of bR integrated Cu2O electrodes is significantly delayed, while the photocurrent of bR integrated CuSCN electrodes is enhanced by about 400%.
BIOSENSORS & BIOELECTRONICS
(2021)
Article
Chemistry, Multidisciplinary
Lukas Pfeifer, Charlotte N. Stindt, Ben L. Feringa
Summary: Molecular machines provide opportunities for developing responsive materials and introducing autonomous motion. Overcrowded alkene-based rotary molecular motors are ideal for designing systems with coupled motions, allowing for precise control. Using a Pd complex of a second-generation rotary motor, we demonstrate a coupled rotation-oscillation motion powered by light, laying a solid foundation for the development of advanced molecular machines.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2023)
Review
Chemistry, Physical
Jiahao Han, Ran Cheng, Luqiao Liu, Hideo Ohno, Shunsuke Fukami
Summary: Antiferromagnets have attracted extensive interest in spintronics and various applications have been developed based on the coherent effects of antiferromagnet dynamics. This Review categorizes and analyzes the critical effects, including spin pumping, spin transmission, electrically induced spin rotation and ultrafast spin-orbit effects, that harness the coherence of antiferromagnets for spintronic applications. Future opportunities in research and applications in coherent antiferromagnetic spintronics are also discussed.
Article
Multidisciplinary Sciences
Binoy K. Hazra, Banabir Pal, Jae-Chun Jeon, Robin R. Neumann, Boerge Goebel, Bharat Grover, Hakan Deniz, Andriy Styervoyedov, Holger Meyerheim, Ingrid Mertig, See-Hun Yang, Stuart S. P. Parkin
Summary: The generation of a robust spin current with both in-plane and out-of-plane spin polarization is demonstrated in epitaxial thin films of the chiral antiferromagnet Mn3Sn in proximity to permalloy thin layers. The in-plane polarized spin current is generated from the interior of Mn3Sn and follows its temperature dependence, while the out-of-plane polarized spin current arises from the spin swapping effect at the Mn3Sn/permalloy interface.
NATURE COMMUNICATIONS
(2023)
Article
Automation & Control Systems
Fengqiu Xu, Ruotong Peng, Kaiyang Zhang, Xianze Xu
Summary: This article studies a dynamic force- and torque-regulating method based on the numerical wrench model and validates it with a 6-degree-of-freedom magnetically levitated (maglev) rotary table. By utilizing the numerical regulator, the maglev rotary table realizes stable multiaxis motions, improves the static decoupling effect, decreases the positioning fluctuations, and enlarges the travel range.
IEEE-ASME TRANSACTIONS ON MECHATRONICS
(2022)
Article
Materials Science, Multidisciplinary
Sutapa Dutta, Ashwin A. Tulapurkar
Summary: By studying Nb/Ni and Ta/Ni bilayers, we find that the sign of the dampinglike torque varies with different material combinations and is dependent on the thickness of the ferromagnet. The orbital current generated from niobium and tantalum can be converted into spin current inside nickel, resulting in the generation of orbital torque.
Article
Acoustics
Farzam Tajdari, Naeim Ebrahimi Toulkani
Summary: This study presents a novel methodology for optimal torque control of a 6-degree-of-freedom Stewart platform, utilizing a linear quadratic integral regulator and online artificial neural network gain tuning to minimize real-time tracking error. Experimental results demonstrate an average improvement of 45% compared to traditional methods, showcasing the robustness of the controller approach.
JOURNAL OF VIBRATION AND CONTROL
(2022)
Article
Chemistry, Physical
Pulak K. Ghosh, Yuxin Zhou, Yunyun Li, Fabio Marchesoni, Franco Nori
Summary: We numerically investigated the dynamics of a mixture of finite-size active and passive disks in a linear array of two-dimensional convection rolls. The interplay of advection and steric interactions produces interesting effects like stirring and separation. These mechanisms are quantitatively characterized by studying the dependence of diffusion constants on the parameters.
Article
Physics, Condensed Matter
C. J. Huggins, S. E. Savel'ev, A. G. Balanov, A. M. Zagoskin
Summary: Demonstration of the experimental feasibility and quantum effects of quantum behavior through the use of superposition of quantum states.
EUROPEAN PHYSICAL JOURNAL B
(2023)
Article
Physics, Applied
P. Navez, A. G. Balanov, S. E. Savel'ev, A. M. Zagoskin
Summary: By using the formalism of quantum electrodynamics, we have developed a comprehensive theoretical framework to describe the interaction between single microwave photons and an array of superconducting transmon qubits in a waveguide cavity resonator. Our analysis reveals the effects of microwave photons on the array's response to a weak probe signal, showing that high quality factor cavities provide better spectral resolution, while moderate quality factor cavities offer better sensitivity for single-photon detection. Surprisingly, our results demonstrate that even a single qubit in a cavity can detect a single-photon signal under realistic system parameters. We also discuss the influence of quantum properties and electrodynamical properties on the response of qubit arrays. This study provides an efficient theoretical foundation for the development and design of quantum devices with qubit arrays, especially those using cavities with explicit expressions for transmission or reflection.
JOURNAL OF APPLIED PHYSICS
(2023)
Article
Optics
Juan Kang, Tao Liu, Mou Yan, Dandan Yang, Xiongjian Huang, Ruishan Wei, Jianrong Qiu, Guoping Dong, Zhongmin Yang, Franco Nori
Summary: Recently, higher-order topological insulators (HOTIs) with topologically nontrivial boundary states have been extensively studied. A novel type of HOTIs called square-root HOTIs, where the topological nature comes from the square of the Hamiltonian, has been experimentally demonstrated in 2D photonic waveguide arrays written in glass using femtosecond laser direct-write techniques. The presence of edge and corner states at visible light spectra has been confirmed experimentally, and the dynamical evolutions of topological boundary states have been observed, suggesting potential applications in information processing and lasing.
LASER & PHOTONICS REVIEWS
(2023)
Article
Physics, Multidisciplinary
Xin-Lei Hei, Peng-Bo Li, Xue-Feng Pan, Franco Nori
Summary: This study predicts a tripartite coupling mechanism in a hybrid setup consisting of a single nitrogen-vacancy (NV) center and a micromagnet, enabling direct and strong tripartite interactions among single NV spins, magnons, and phonons. By modulating the relative motion between the NV center and the micromagnet, a tunable and strong spin-magnon-phonon coupling at the single quantum level can be achieved. This opens up possibilities for quantum spin-magnonics-mechanics and paves the way for general applications in quantum simulations and information processing.
PHYSICAL REVIEW LETTERS
(2023)
Article
Physics, Applied
D. P. Patnaik, Y. Ushakov, Z. Zhou, P. Borisov, M. D. Cropper, U. W. Wijayantha, A. G. Balanov, S. E. Savel'ev
Summary: This study found that varying temperature can efficiently control the states and charges transport of memristors, even allowing for reset when it cannot be done by varying the applied voltage.
PHYSICAL REVIEW APPLIED
(2023)
Article
Materials Science, Multidisciplinary
Xing-Liang Dong, Peng -Bo Li, Jia-Qiang Chen, Fu-Li Li, Franco Nori
Summary: In this study, we investigate the interaction between quantum emitters (QEs) and a photonic structured bath made of bilayer square lattices. We find that the resonance anticrossing between the energy bands in the bath opens a symmetric middle energy gap. When the emitters' transition frequencies lie in the middle of the band gap, the QE-photon dressed states generated in this inner band gap exhibit odd neighbor, robust, and anisotropic characteristics due to the intrinsic chiral symmetry of the bath and interactions with the squarelike band edges. Using giant artificial atoms, we can engineer and modify the patterns of these dressed states, which can lead to spin models with symmetry protection and result in fascinating many-body phases. We demonstrate that this proposal can be used to generate both edge states and corner states in the generalized two-dimensional Su-Schrieffer-Heeger model. This work opens up new avenues for research in innovative quantum many-body physics and quantum simulations with photonic or phononic multilayer structures.
Article
Optics
Zheng-Yang Zhou, Clemens Gneiting, J. Q. You, Franco Nori
Summary: Cluster states are important for measurement-based quantum computing and their generation in specific systems indicates their potential for quantum technologies. In this study, we investigate the generation of cluster states in networks of degenerate optical parametric oscillators (DOPOs) known as coherent Ising machines (CIMs). We show that coherent cluster states can be generated in DOPO networks using beam splitters and classical pumps, and provide the minimum requirements for their generation under realistic conditions. We also discuss the use of nonequilibrium pumps to improve the generation of coherent cluster states, and assess their quality using entanglement criteria tailored for spin-based cluster states.
Article
Physics, Multidisciplinary
Mauro Cirio, Neill Lambert, Pengfei Liang, Po-Chen Kuo, Yueh-Nan Chen, Paul Menczel, Ken Funo, Franco Nori
Summary: We propose a discrete fermion approach for modeling strong interaction between an arbitrary system and continuum electronic reservoirs. This method is based on a pseudofermion decomposition of the continuum bath correlation functions and is only limited by the accuracy of this decomposition. We demonstrate that this approach can accurately capture the strongly correlated low-temperature physics of Kondo resonance, even in the scaling limit, by employing matrix product state techniques.
PHYSICAL REVIEW RESEARCH
(2023)
Article
Physics, Multidisciplinary
Kamran Akbari, Will Salmon, Franco Nori, Stephen Hughes
Summary: We generalise the Dicke model by studying the case of two dissimilar atoms in the regime of ultrastrongly-coupled cavity quantum electrodynamics. Our approach uses gauge-invariant master equations, which give consistent results in both standard multipolar and Coulomb gauges, and consider system-bath interactions for open cavity systems. We demonstrate the use of a second atom as a sensor to measure the output spectrum from a single atom in the ultrastrong-coupling regime and compare it with the quantum regression theorem. We also investigate the complex coupling effects and additional resonances and spectral features that arise when the second atom is also ultrastrongly coupled to the cavity with different parameters.
PHYSICAL REVIEW RESEARCH
(2023)
Article
Materials Science, Multidisciplinary
M. P. Liul, C. -H. Chien, C. -Y. Chen, P. Y. Wen, J. C. Chen, Y. -H. Lin, S. N. Shevchenko, Franco Nori, I. -C. Hoi
Summary: This study focuses on the dynamics and stationary regime of a capacitively shunted transmon-type qubit in front of a mirror. The qubit is influenced by probe and dressing signals, and by varying their parameters and analyzing the reflected probe signal, the system dynamics can be explored using the Bloch equation. The time-dependent occupation probabilities obtained are correlated with the experimentally measured reflection coefficient. This research opens up new perspectives in understanding the properties of qubit plus mirror circuits and related physical processes, such as Landau-Zener-Stuckelberg-Majorana transitions.
Article
Materials Science, Multidisciplinary
Qian Bin, Liang-Liang Wan, Franco Nori, Ying Wu, Xin-You Lue
Summary: We propose a physical witness for detecting topological phase transitions (TPTs) using an experimentally observable out-of-time-order correlation (OTOC). The OTOC dynamics can distinguish between topological trivial and nontrivial phases due to topological locality. In the long-time limit, the OTOC undergoes a zero-to-finite-value transition at the critical point of the TPTs. This proposed OTOC witness is robust and can be applied to systems with and without chiral symmetry, even in the presence of disorder.
Article
Physics, Multidisciplinary
Ievgen I. Arkhipov, Adam Miranowicz, Franco Nori, Sahin K. Ozdemir, Fabrizio Minganti
Summary: Finite simplex lattice models have various practical applications in different scientific fields. This study demonstrates the construction of solvable non-Hermitian n-simplex lattice models by reducing the high-order field-moments space of quadratic bosonic systems. These models provide a versatile platform for simulating non-Hermitian phenomena in real-space and gaining insights into complex many-body systems.
PHYSICAL REVIEW RESEARCH
(2023)
Article
Chemistry, Physical
Vyacheslav R. Misko, Larysa Baraban, Denys Makarov, Tao Huang, Pierre Gelin, Ileana Mateizel, Koen Wouters, Neelke De Munck, Franco Nori, Wim De Malsche
Summary: This study proposes a novel method for selecting active species based on their motility using an acoustofluidic setup. Highly motile species can escape from the acoustic trap, making this method suitable for selecting active species like sperm for medically assisted reproduction. The proposed method is more flexible and can also be applied to other active systems.
Article
Physics, Multidisciplinary
Roberto Stassi, Mauro Cirio, Ken Funo, Jorge Puebla, Neill Lambert, Franco Nori
Summary: We propose a method to convert the virtual photonic state entangled with an atom into a real state while preserving the entanglement. The process can be reversed to restore the entangled state in the vacuum. Experimental realization of this proposal will enable the investigation of exotic phenomena such as particle emission from vacuum and extraction of quantum superposition states from vacuum. Additionally, it allows for the examination of the ground state in the ultrastrong coupling regime and generation of on-demand entangled states for quantum information processing.
PHYSICAL REVIEW RESEARCH
(2023)