Article
Physics, Condensed Matter
E. Stepanets-Khussein, L. I. Musina, A. V. Larionov, A. S. Zhuravlev, I. V. Kukushkin, L. V. Kulik
Summary: The study investigates the structure of a time-resolved Kerr rotation signal for different spin states of a two-dimensional electron system subjected to a quantizing magnetic field. At low temperatures, with spin-spin correlations defining the ground state, the data show nonlinear damping of Larmor oscillations.
SOLID STATE COMMUNICATIONS
(2021)
Article
Chemistry, Multidisciplinary
Hosung Ki, Seungjoo Choi, Jungmin Kim, Eun Hyuk Choi, Seonggon Lee, Yunbeom Lee, Kihwan Yoon, Chi Woo Ahn, Doo-Sik Ahn, Jae Hyuk Lee, Jaeku Park, Intae Eom, Minseok Kim, Sae Hwan Chun, Joonghan Kim, Hyotcherl Ihee, Jeongho Kim
Summary: In this study, an alternative method, femtosecond time-resolved X-ray liquidography (fs-TRXL), was used to monitor microscopic structural motions related to the Optical Kerr effect response in molecular liquids using X-ray solution scattering. Different types of molecular motions were successfully resolved selectively without the need for theoretical modeling, based on anisotropy and extra structural information in the scattering data.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2021)
Article
Chemistry, Multidisciplinary
Michael Berger, Dominik Schulz, Jamal Berakdar
Summary: Quantum scars refer to enhanced localization of probability density of states in spectral regions with high energy levels. The study showed that spin-dependent scarring occurs in spin-coupled electronic systems, which can be detected through transport measurements or spin-polarized scanning tunneling spectroscopy.
Article
Physics, Multidisciplinary
Sandra Ruiz-Gomez, Ruben Guerrero, Muhammad W. Khaliq, Claudia Fernandez-Gonzalez, Jordi Prat, Andres Valera, Simone Finizio, Paolo Perna, Julio Camarero, Lucas Perez, Lucia Aballe, Michael Foerster
Summary: The spin Hall effect and the inverse spin Hall effect are important spin-charge conversion mechanisms. The direct spin Hall effect can induce surface spin accumulation in nonmagnetic conductors. However, most detection schemes involve interfaces, resulting in considerable scattering in the reported data. Interface-free measurements on highly Bi-doped Cu (Cu95Bi5) using x-ray spectroscopy reveal a similar induced magnetic moment as that of Pt measured by magneto-optics, highlighting the potential of CuBi for spin-charge conversion applications.
Article
Physics, Applied
A. Marchionni, C. Zucchetti, F. Ciccacci, M. Finazzi, H. S. Funk, D. Schwarz, M. Oehme, J. Schulze, F. Bottegoni
Summary: GeSn alloy shows potential for the integration of spintronics, photonics, and electronics. Research investigates the photoinduced inverse spin-Hall effect at different energy ranges, extracting a significantly larger spin-Hall angle in GeSn compared to pure Ge. The spin-charge interconversion in GeSn is found to be approximately 4.3 times larger for electrons in the Delta valleys than in the L valleys.
APPLIED PHYSICS LETTERS
(2021)
Article
Materials Science, Multidisciplinary
Oliver Busch, Boerge Goebel, Ingrid Mertig
Summary: The spin Hall effect is typically associated with spin-orbit interaction, but it can also occur in specific materials even in absence of spin-orbit coupling. Coplanar kagome antiferromagnets Mn3X are interesting candidates for applications involving spin currents. The main contribution to the intrinsic spin Hall signal in these materials comes from noncollinear magnetic texture and is most significant in coplanar systems. Furthermore, spin-orbit coupling or out-of-plane tilting of magnetic moments can effectively reduce the spin Hall effect.
Article
Chemistry, Physical
Caleb J. C. Jordan, Jan R. R. Verlet
Summary: The study demonstrates the successful application of optical Kerr gating to overcome fluorescence interference in studying the excited state dynamics of molecules at interfaces using second-order non-linear spectroscopic methods. This new approach has been shown to be effective in discriminating against fluorescence signals in various systems.
JOURNAL OF CHEMICAL PHYSICS
(2021)
Article
Physics, Applied
J. E. Abrao, G. Carlini, J. B. S. Mendes, A. Azevedo
Summary: This study demonstrates the control of spin Hall angle θ(SH) through engineered arrays of Ag microdisks, showing an increase in current generated by spin pumping as the number of disks increase while maintaining their size and shape fixed.
APPLIED PHYSICS LETTERS
(2022)
Article
Quantum Science & Technology
Yi-Ping Wang, He Wang
Summary: We propose a theoretical method to study the topological properties of spin-phonon coupled modes in a one-dimensional superconducting resonator lattice. Different topological structures can be displayed by adjusting the coupling parameters, and the topological index of the system's phases can be distinguished.
QUANTUM INFORMATION PROCESSING
(2023)
Article
Materials Science, Multidisciplinary
Akimitsu Watanabe, Hiroto Adachi, Yusuke Kato
Summary: In this study, we theoretically analyze the contribution of superconducting fluctuations to spin Hall effects. The results show that in two-dimensional systems, superconducting fluctuations have a suppressive effect on the extrinsic spin Hall effect, but an enhancing effect on the intrinsic spin Hall effect.
Article
Chemistry, Multidisciplinary
Lixuan Xu, Yiwei Li, Yuqiang Fang, Huijun Zheng, Wujun Shi, Cheng Chen, Ding Pei, Donghui Lu, Makoto Hashimoto, Meixiao Wang, Lexian Yang, Xiao Feng, Haijun Zhang, Fuqiang Huang, Qikun Xue, Ke He, Zhongkai Liu, Yulin Chen
Summary: The evolution of physical properties in 2D materials from monolayer to bulk introduces unique effects due to dimension confinement and provides a tuning knob for applications. The novel 2M-TMDs, consisting of translationally stacked 1T'-monolayers, exhibit tunable inverted bandgaps and interlayer coupling, making them promising as building blocks for various topological phases. By using advanced spectroscopy and calculations, a topology hierarchy is revealed, showing different topological insulator states in 2M-WSe2, MoS2, MoSe2, and 2M-WS2 due to band inversion amplitude and interlayer coupling. These 2M-TMDs are proposed as parent compounds for exotic phases and have great potential in quantum electronics due to their flexibility in patterning with 2D materials.
ADVANCED MATERIALS
(2023)
Article
Multidisciplinary Sciences
Chunruo Duan, R. E. Baumbach, Andrey Podlesnyak, Yuhang Deng, Camilla Moir, Alexander J. Breindel, M. Brian Maple, E. M. Nica, Qimiao Si, Pengcheng Dai
Summary: Superconductivity arises from electron Cooper pairs that can move without resistance below a certain temperature. In some materials, such as UTe2, spin-triplet pairing is possible, which is important for quantum computation. The observation of sharp magnetic excitation in UTe2 suggests a possible coupling between superconductivity and antiferromagnetic spin fluctuations.
Article
Multidisciplinary Sciences
Cheng Chi, Qiao Jiang, Zhixin Liu, Liheng Zheng, Meiling Jiang, Han Zhang, Feng Lin, Bo Shen, Zheyu Fang
Summary: The study demonstrates selective manipulation of photon spin angular momentum at a deep subwavelength scale via electron-induced OSHE in Au nanoantennas, suggesting an information encoding scheme with robustness, privacy, and high level of integration for future quantum applications.
Article
Materials Science, Multidisciplinary
M. M. Glazov, L. E. Golub
Summary: We develop a theory for the spin and valley Hall effects in two-dimensional systems caused by asymmetricskew-scattering. The results show that the scattering asymmetry only appears in processes where interaction between particles in the initial and intermediate states is present. For degenerate electrons or nondegenerate particles, the spin and valley currents induced by interparticle collisions are suppressed, and their steady-state values are proportional to the squared temperature or density, respectively. The study also demonstrates strong deviations from the conventional picture of interparticle scattering for the skew scattering of two-dimensional degenerate bosons, such as excitons or exciton polaritons.
Review
Chemistry, Multidisciplinary
Michael S. Lodge, Shengyuan A. Yang, Shantanu Mukherjee, Bent Weber
Summary: Atomically thin topological materials, such as the quantum spin Hall insulator, show great potential for applications in quantum computing and electronic devices, with large tunable bulk bandgaps and gapless edge states.
ADVANCED MATERIALS
(2021)
Article
Physics, Applied
Megumi Kurosu, Daiki Hatanaka, Hajime Okamoto, Hiroshi Yamaguchi
Summary: The research team successfully fabricated and characterized a silicon phonon waveguide structure with PZT piezoelectric transducers, enabling the evaluation of nonlinearity. They observed a softening nonlinear response as a function of drive power and demonstrated the ability for mode shift and frequency conversion.
JAPANESE JOURNAL OF APPLIED PHYSICS
(2022)
News Item
Physics, Multidisciplinary
H. Yamaguchi, D. Hatanaka
Article
Physics, Applied
D. Hatanaka, M. Asano, H. Okamoto, Y. Kunihashi, H. Sanada, H. Yamaguchi
Summary: This article reports a planar cavity magnomechanical system that uses standing acoustic waves to enhance spatial and spectral power density, achieving magnified magnon-phonon coupling. This system provides a new method for the coherent acoustic control of magnons and the development of spin-acoustic technologies.
PHYSICAL REVIEW APPLIED
(2022)
Article
Physics, Applied
Wataru Tomita, Satoshi Sasaki, Motoki Asano, Kouta Tateno, Hajime Okamoto, Hiroshi Yamaguchi
Summary: In this study, a nanowire-based electromechanical resonator device with vacuum-gap and orthogonally aligned double-gate geometry is used to independently control two nearly degenerate orthogonal vibration modes. The piezoresistance mechanism dominates the motion-induced conductance variation in the device, providing an efficient method for converting vibrational motion into an electric signal. By applying two gate voltages simultaneously, an opposite combined effect on the frequency shift between the two vibration modes is achieved, which is well explained by model calculations. This study demonstrates the vectorial control of two mode frequencies using the opposite double-gate effect, which is not possible with single-gate geometry.
PHYSICAL REVIEW APPLIED
(2022)
Article
Physics, Applied
Heorhii Bohuslavskyi, Masayuki Hashisaka, Takase Shimizu, Takafumi Akiho, Koji Muraki, Norio Kumada
Summary: We have developed a high-speed and low-noise time-domain current measurement scheme using a homemade cryogenic transimpedance amplifier (TIA), which is versatile for broad cryogenic current measurements, including semiconductor spin-qubit readout. The TIA has a broad frequency bandwidth and a low noise floor, and the performance can be adjusted by changing the feedback resistance.
APPLIED PHYSICS LETTERS
(2022)
Article
Optics
Katsumasa Yoshioka, Taro Wakamura, Masayuki Hashisaka, Kenji Watanabe, Takashi Taniguchi, Norio Kumada
Summary: Researchers have developed a gate-tunable graphene photodetector with a high bandwidth by using a resistive zinc oxide top gate. They found that the optical-to-electrical conversion in graphene is almost instantaneous and can be controlled by adjusting the Fermi level. This study bridges the gap between ultrafast optical science and device engineering, advancing the development of ultrafast graphene optoelectronic applications.
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
Multidisciplinary Sciences
Motoki Asano, Hiroshi Yamaguchi, Hajime Okamoto
Summary: This study introduces a new probe technology using twin-microbottle resonators to achieve high-performance sensing of liquid samples. This technique enables in situ metrology in arbitrary media and has the potential to be applied in ultrasensitive biochips and rheometers.
Article
Physics, Applied
Katsuhiko Nishiguchi, Hiroshi Yamaguchi, Akira Fujiwara, Herre S. J. van der Zant, Gary A. Steele
Summary: We have demonstrated charge detection with single-electron resolution at high readout frequency using a silicon field-effect transistor integrated with double resonant circuits. The transistor, with a channel width of 10 nm, can detect a single electron at room temperature. The transistor is connected to resonant circuits composed of coupled inductors and capacitors, providing two resonance frequencies. By driving the transistor with a carrier signal at the lower resonance frequency, a small signal applied to the transistor's gate modulates the resonance condition, resulting in a reflected signal appearing near the higher resonance frequency. This operation allows for charge detection with a single-electron resolution of 3 x 10(-3) e/Hz(0.5) and a readout frequency of 200 MHz at room temperature.
APPLIED PHYSICS LETTERS
(2023)
Article
Physics, Applied
Katsuhiko Nishiguchi, Hiroshi Yamaguchi, Akira Fujiwara
Summary: We detect the mechanical oscillations of a nanoelectromechanical system (NEMS) composed of a multilayer-graphene (MLG) membrane using a Si field-effect transistor (FET) and a microwave probe connected to double-resonant circuits. The mechanical oscillations of the MLG membrane as it functions as the gate of the FET are monitored through modulation of the FET's impedance. This rf-signal-driven readout at 340 MHz allows for highly sensitive and functional sensors for small mass and quantum mechanics as well as timing devices.
PHYSICAL REVIEW APPLIED
(2023)
Article
Physics, Applied
Motoki Asano, Hiroshi Yamaguchi, Hajime Okamoto
Summary: In this study, a sub-femtogram resolution in-liquid cavity optomechanical mass sensor based on the twin-microbottle glass resonator is demonstrated. Evaluation of the frequency stability using an optomechanical phase-locked loop shows that this sensor provides the highest mass resolution of (7.0 +/- 2.0) x 10(- 16)g in water, which is four orders of magnitude better than the first-generation setup. The highly sensitive mass sensor can be utilized as a free-access optomechanical probe in liquid for various in situ chemical and biological metrology applications.
APPLIED PHYSICS EXPRESS
(2023)
Article
Physics, Applied
M. Kurosu, D. Hatanaka, R. Ohta, H. Yamaguchi, Y. Taniyasu, H. Okamoto
Summary: We have demonstrated an almost impedance-matched high-overtone bulk acoustic resonator (HBAR) operating at super high frequency ranges. It utilizes an epitaxial AlN piezoelectric layer directly grown on a conductive SiC cavity substrate without the need for a metal layer insertion. Our HBAR achieves broadband phonon cavity modes up to the K-band (26.5 GHz) and has a high figure of merit of f x Q=1.3x10(13) Hz at 10 GHz. This technology holds great potential for the development of microwave signal processing devices for 5G and future 6G communication systems, as well as research on high-frequency acoustic systems hybridized with electric, optical, and magnetic systems.
APPLIED PHYSICS LETTERS
(2023)
Article
Physics, Applied
Daiki Hatanaka, Motoki Asano, Hajime Okamoto, Hiroshi Yamaguchi
Summary: Phononic crystals (PnC) can confine phonons in a small area due to a band gap, enhancing their interaction with different systems. In this study, PnC is used to manipulate magnons via ultrahigh frequency phonons confined in a phononic cavity, exciting magnons in a micromagnet through magnetostriction. Furthermore, the magnetoelastic interaction is modulated by selectively exciting cavity resonant modes. These results open up new possibilities for PnC cavity magnomechanics and universal controls of ultrahigh frequency magnons and phonons with PnC circuits.
PHYSICAL REVIEW APPLIED
(2023)
Article
Engineering, Multidisciplinary
V. A. Seleznev, V. S. Tumashev, H. Yamaguchi, V. Ya. Prinz
Summary: A new method for fabricating large-area metal and semiconductor nanobridge arrays is proposed in this article, which combines the possibilities offered by nanotransfer printing and UV lithography. The method involves imprinting an array of nanostrips into a resist layer and subsequent UV exposure through an additional mask to define the regions where suspended nanostrip bridges will be formed. Using this method, large-area arrays of Au and Ti/Au nanobridge, as well as SiGe nanobridge arrays, were successfully fabricated. The proposed method is simple, low-cost, and can be implemented on solid and polymer substrates.
PRECISION ENGINEERING-JOURNAL OF THE INTERNATIONAL SOCIETIES FOR PRECISION ENGINEERING AND NANOTECHNOLOGY
(2023)
Article
Physics, Multidisciplinary
H. Kamata, H. Irie, N. Kumada, K. Muraki
Summary: This paper presents a versatile on-chip time-resolved transport measurement scheme applicable to narrow-gap systems. The authors conducted experiments on noninverted InAs/InxGa1-xSb composite quantum wells and observed pulsed charge waveforms for both electrons and holes. They found that the group velocity of edge magnetoplasmon pulses is reduced and broadened in both the electron and hole regimes, suggesting the influence of charge puddles in the bulk.
PHYSICAL REVIEW RESEARCH
(2022)
