Article
Materials Science, Multidisciplinary
Risto Ojajarvi, Tero T. Heikkila, P. Virtanen, M. A. Silaev
Summary: This study develops a theory of the spin battery effect in superconductor/ferromagnetic insulator systems, taking into account the magnetic proximity effect. The findings demonstrate that spin-energy mixing enabled by superconductivity can enhance spin accumulation by several orders of magnitude, leading to a giant inverse spin Hall effect. The study also suggests a nonlocal electrical detection scheme to probe the spin accumulation driven by magnetization dynamics, and predicts a giant Seebeck effect and enhanced sensitivity of magnon detection.
Article
Multidisciplinary Sciences
J. Maklar, Y. W. Windsor, C. W. Nicholson, M. Puppin, P. Walmsley, V. Esposito, M. Porer, J. Rittmann, D. Leuenberger, M. Kubli, M. Savoini, E. Abreu, S. L. Johnson, P. Beaud, G. Ingold, U. Staub, I. R. Fisher, R. Ernstorfer, M. Wolf, L. Rettig
Summary: Interactions between many-body systems and intense light pulses can lead to novel phenomena far from equilibrium, such as optically enhanced critical temperatures in superconductors. Using experimental probes, a transient charge-density-wave order in TbTe3 was reported, described using a non-equilibrium transition temperature model.
NATURE COMMUNICATIONS
(2021)
Article
Materials Science, Multidisciplinary
Y. B. Shi, K. L. Zhang, Z. Song
Summary: This study investigates the quench dynamics of a Kitaev chain and reveals a balance between different pairing channels in determining the quantum phase diagram. The research also presents an alternative approach to generating a superconducting state dynamically from an empty state.
Article
Physics, Multidisciplinary
Yuta Murakami, Shintaro Takayoshi, Tatsuya Kaneko, Zhiyuan Sun, Denis Golez, Andrew J. Millis, Philipp Werner
Summary: In this study, the authors introduce a generalized Gibbs ensemble description to systematically analyze the long-time behavior of photo-doped states in Mott insulators. They demonstrate the power of the method by mapping out the nonequilibrium phase diagram of the one-dimensional extended Hubbard model, clarifying the formation mechanism of non-thermal phases in this system.
COMMUNICATIONS PHYSICS
(2022)
Article
Physics, Applied
Ryo Kawarazaki, Hideki Narita, Yuta Miyasaka, Yuhei Ikeda, Ryusuke Hisatomi, Akito Daido, Yoichi Shiota, Takahiro Moriyama, Youichi Yanase, Alexey Ognev, Alexander S. Samardak, Teruo Ono
Summary: Recently, an ultimate diode effect, where electric current shows superconducting state in one direction and normal state in the other direction, has been discovered in a noncentrosymmetric superlattice. The polarity of the diode shows sign reversal with an increase in magnetic field, indicating a nonlinear behavior beyond the phenomenology predicted by the Ginzburg-Landau theory. Microscopic studies suggest that the crossover and phase transitions of finite-momentum pairing states could be the possible origin of the sign reversals.
APPLIED PHYSICS EXPRESS
(2022)
Article
Materials Science, Multidisciplinary
Shi-Qi Hu, Hui Zhao, Chao Lian, Xin-Bao Liu, Meng-Xue Guan, Sheng Meng
Summary: This study explores light-modulated electron-phonon coupling in photoexcited graphene, demonstrating a significant enhancement by modulating the density and distribution of photocarriers. The findings provide insights into ultrafast electron-phonon coupling and its real-time tracking.
NPJ QUANTUM MATERIALS
(2022)
Article
Materials Science, Multidisciplinary
Chenghao Shen, Ranran Cai, Alex Matos-Abiague, Wei Han, Jong E. Han, Igor Zutic
Summary: We explain how Rashba spin-orbit coupling can lead to a large magnetoresistance in a two-dimensional electron gas or a conventional s-wave superconductor, even with only one ferromagnet. This enhanced magnetoresistance can be nonmonotonic and change its sign with Rashba SOC. In quasi-2D van der Waals ferromagnets coupled with conventional s-wave superconductors, we observe an enhanced magnetoresistance due to the presence of Rashba SOC, which reduces the effective interfacial strength and results in equal-spin Andreev reflection, providing evidence for proximity-induced equal-spin-triplet superconductivity.
Article
Materials Science, Multidisciplinary
Jiajun Li, Martin Eckstein
Summary: The study introduces a steady-state description of photodoped Mott insulators using an open-system setup, overcoming the challenge of dealing with exponentially separated time scales in multiband systems. The stationary photodoped states exhibit the same properties as transient counterparts and can be parameterized by a few physical quantities.
Article
Materials Science, Multidisciplinary
Hao Huan, Yang Xue, Bao Zhao, Hairui Bao, Lei Liu, Zhongqin Yang
Summary: Layered iron chalcogenide materials have recently attracted attention due to their high-temperature superconductivity. However, topological phases are rarely proposed in these materials. In this study, we predict the existence of 100% spin-polarized Weyl semimetals in two-dimensional TlFeSe and GaFeSe monolayers, based on density-functional theory calculations and symmetry analysis. The Weyl fermions in these monolayers are protected by nonsymmorphic symmetry. Additionally, we find that the InFeSe monolayer is a quantum anomalous Hall insulator.
Article
Multidisciplinary Sciences
Masakazu Matsubara, Takatsugu Kobayashi, Hikaru Watanabe, Youichi Yanase, Satoshi Iwata, Takeshi Kato
Summary: The magnetic metamaterial introduced in this study generates photo-driven ultrafast spin currents at room temperature and can be directed and adjusted in magnitude by tuning the polarization of the incident light.
NATURE COMMUNICATIONS
(2022)
Article
Multidisciplinary Sciences
Hiroki Arisawa, Hang Shim, Shunsuke Daimon, Takashi Kikkawa, Yasuyuki Oikawa, Saburo Takahashi, Takahito Ono, Eiji Saitoh
Summary: The authors report the manipulation of the thickness of thin films of ferromagnetic material by spin current, demonstrating the spin current volume effect (SVE). Theoretical calculations and experimental results show that injecting a spin current using Tb0.3Dy0.7Fe2 can change the sample volume, expanding the application of spintronics into mechanical devices.
NATURE COMMUNICATIONS
(2022)
Article
Physics, Applied
Duo Zhao, Xiaolei Wang, Zhijie Wang, Dahai Wei
Summary: This study demonstrates the control of spin-triplet Cooper pairs in superconducting/ferromagnet heterostructures using magnetic proximity effect and spin-orbit coupling. The fabricated Co/Nb/Pt heterostructures successfully suppress the critical temperature (T (C)) and modulate the superconducting properties through independent control of spin-orbit coupling and magnetic proximity effect. These findings offer a new approach for the design of superconducting spintronics devices.
JOURNAL OF PHYSICS D-APPLIED PHYSICS
(2022)
Article
Physics, Multidisciplinary
Dongwook Go, Daegeun Jo, Kyoung-Whan Kim, Soogil Lee, Min-Gu Kang, Byong-Guk Park, Stefan Bluegel, Hyun-Woo Lee, Yuriy Mokrousov
Summary: Contrary to the common assumption, the orbital response in ferromagnets can exhibit remarkable long-ranged behavior, even in the presence of strong crystal field potential and orbital quenching. By studying a bilayer structure composed of a nonmagnet and a ferromagnet, it is found that induced orbital angular momentum can extend far beyond the spin dephasing length, even when an external electric field is applied only on the nonmagnet. This behavior is attributed to nearly degenerate orbital characters imposed by crystal symmetry, which form hotspots for the intrinsic orbital response. The findings suggest the potential use of long-range orbital response in orbitronic device applications.
PHYSICAL REVIEW LETTERS
(2023)
Article
Chemistry, Physical
Xingchi Mu, Yiming Pan, Jian Zhou
Summary: We have elucidated a bias-free light-induced orbital and spin current through nonlinear response theory, and demonstrated this effect in two-dimensional nonmagnetic ferroelectric materials. This hidden photo-induced pure orbital current could lead to a pure spin current via spin-orbit coupling interactions, offering a route to generalizing nanoscale devices into orbitronics and spintronics.
NPJ COMPUTATIONAL MATERIALS
(2021)
Article
Materials Science, Multidisciplinary
Yuichi Fujita, Taisuke Sasaki, Yuya Sakuraba
Summary: This article demonstrates the process of improving the surface morphology of an epitaxial NbN layer and the epitaxial growth of a Co-based Heusler alloy, Co2FeSi, film on the surface-flattened NbN epilayer. By using Cr buffer layers and post-deposition annealing, the surface roughness of the NbN layers is successfully suppressed, resulting in atomically flat interfaces with the CFS layers. However, minor diffusion of N atoms from the NbN layer into the Cr buffer layer is observed, which may affect the crystallinity of the NbN layer.
