Article
Physics, Applied
Xingchen Liu, Hongming Guan, Ning Tang, Yuanjie Lv, Ling Chen, Xiaoyue Zhang, Shixiong Zhang, Yunfan Zhang, Xinqiang Wang, Weikun Ge, Bo Shen
Summary: The study investigated the angle and external gate-voltage dependences of the interfacial spin-orbit coupling in GaN nanowires using circular photo-galvanic effect (CPGE). The interfacial SOC-induced CPGE shows a twofold degeneracy, while the removal of the sixfold degeneracy is attributed to the asymmetrical optical absorption. The interfacial SOC-induced CPGE shows a weak dependence on the external gate voltage, which is totally different from the WSIA-related SOC.
APPLIED PHYSICS LETTERS
(2021)
Article
Physics, Multidisciplinary
Jonathan B. Curtis, Nicholas R. Poniatowski, Yonglong Xie, Amir Yacoby, Eugene Demler, Prineha Narang
Summary: A recent experiment demonstrated that proximity-induced Ising spin-orbit coupling can enhance spin-triplet superconductivity in Bernal bilayer graphene. However, the fluctuations of the spin orientation of the triplet order parameter in graphene suppress the superconducting transition to nearly zero temperature due to its perfect spin rotation symmetry. Both Ising spin-orbit coupling and an in-plane magnetic field can eliminate these fluctuations, significantly increasing the transition temperature, as supported by our analysis and consistent with the experiment. Our model also suggests the existence of a phase with quasilong-range ordered spin-singlet charge 4e superconductivity at low anisotropy and magnetic field, while the triplet 2e superconducting order only exhibits short-ranged correlations. Relevant experimental signatures are discussed.
PHYSICAL REVIEW LETTERS
(2023)
Article
Mathematics, Applied
Michael Holst, Houdong Hu, Jianfeng Lu, Jeremy L. Marzuola, Duo Song, John Weare
Summary: This paper studies symmetry breaking in the mean field solutions to the electronic structure problem for the 2 electron hydrogen molecule within the Kohn Sham (KS) local spin density functional theory with Dirac exchange. It finds that the behavior of the simplified model is related to that of the (KS) spin density functional theory predictions in condensed matter and molecular systems. The paper further analyzes and numerically computes the limiting behavior of the solutions, leading to further bifurcations and highly localized states.
JOURNAL OF NONLINEAR SCIENCE
(2022)
Article
Physics, Applied
Giovanni Azzolina, Roman Bertoni, Eric Collet
Summary: Spin-transition materials can undergo various types of phase transitions, including non-symmetry-breaking spin transitions and symmetry-breaking phenomena like structural order or spin-state concentration waves. The Landau approach can be used to describe the coupling between these two types of instabilities, generating different sequences of phase transitions.
JOURNAL OF APPLIED PHYSICS
(2021)
Article
Physics, Multidisciplinary
Junting Zhang, Ying Zhou, Fan Wang, Xiaofan Shen, Jianli Wang, Xiaomei Lu
Summary: This study demonstrates spin-induced ferroelectricity in even-layer perovskite systems and explains its origin. The phenomenon is common in double-perovskite systems and can coexist with ferromagnetism or ferrimagnetism, providing a universal design for two-dimensional multiferroics and enabling the control of polarization by means of a magnetic field.
PHYSICAL REVIEW LETTERS
(2022)
Article
Nanoscience & Nanotechnology
Muhammad Ashar Naveed, Muhammad Afnan Ansari, Inki Kim, Trevon Badloe, Joohoon Kim, Dong Kyo Oh, Kashif Riaz, Tauseef Tauqeer, Usman Younis, Murtaza Saleem, Muhammad Sabieh Anwar, Muhammad Zubair, Muhammad Qasim Mehmood, Junsuk Rho
Summary: The team successfully designed a metasurface based on asymmetrical spin-orbit interactions that operates in the visible light domain using low-loss dielectric materials. This cost-effective design offers potential applications in asymmetric data inscription and smartphone displays, among others.
MICROSYSTEMS & NANOENGINEERING
(2021)
Article
Multidisciplinary Sciences
Guangxiu Liu, Maocai Pi, Long Zhou, Zhehong Liu, Xudong Shen, Xubin Ye, Shijun Qin, Xinrun Mi, Xue Chen, Lin Zhao, Bowen Zhou, Jia Guo, Xiaohui Yu, Yisheng Chai, Hongming Weng, Youwen Long
Summary: The authors have discovered a non-orientable Roman surface can be realized in a solid through antiferromagnetic-induced polarization. By studying the spin-induced ferroelectric polarizations in cubic perovskite oxides, a path-dependent topological magnetoelectric effect has been demonstrated as a way to detect the global geometry of a surface.
NATURE COMMUNICATIONS
(2022)
Article
Astronomy & Astrophysics
V. Baru, E. Epelbaum, A. A. Filin, C. Hanhart, A. V. Nefediev
Summary: Heavy-quark spin symmetry applies to the direct decay of heavy quarkonia, but can be overcome in the presence of multiquark intermediate states. The violation of HQSS can be balanced by the narrowness of the intermediate states, resulting in equal transition strengths into final states with different total heavy quark spins. Spin symmetry is restored when the mass of a heavy quark becomes infinite.
Article
Chemistry, Multidisciplinary
Yutao Sang, Qirong Zhu, Xiaoqin Zhou, Yuqian Jiang, Li Zhang, Minghua Liu
Summary: This study describes the self-assembly of an achiral molecule into a macroscopic helical structure and the emergent chiral-selective spin-filtering effect. A benzene-1,3,5-tricarboxamide (BTA) motif with an aminopyridine group in each arm was found to coordinate with Ag-I and self-assemble into nanospheres. Symmetry breaking occurred upon sonication, resulting in the transformation of nanospheres into helical nanofibers with strong circular dichroism (CD) signals. The CD signals could be controlled by using the chiral assemblies as a seed. Additionally, the helical nanofibers exhibited highly selective charge transport with a spin-polarization transport of up to 45%, despite being composed exclusively of achiral building blocks.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2023)
Article
Multidisciplinary Sciences
Yunfeng You, Hua Bai, Xiaoyu Feng, Xiaolong Fan, Lei Han, Xiaofeng Zhou, Yongjian Zhou, Ruiqi Zhang, Tongjin Chen, Feng Pan, Cheng Song
Summary: The study demonstrates the generation of out-of-plane spin polarization sigma(z) using cluster magnetic octupole in antiperovskite AFM Mn3SnN, providing a potential path for current induced spin-orbit torque (SOT) switching of adjacent perpendicular ferromagnet without external magnetic field.
NATURE COMMUNICATIONS
(2021)
Article
Optics
Xuecai Zhang, Junhong Deng, Yutao Tang, Yang Li, Guanqing Zhang, Zixian Hu, Guixin Li
Summary: Symmetry plays an important role in determining the properties of nonlinear optical waves in crystals. The symmetry in photonic meta-crystals can be easily controlled, allowing for the tailoring of their linear and nonlinear optical properties. By introducing coupling between adjacent plasmonic meta-atoms, the symmetry of nonlinear meta-crystals can be manipulated, leading to the observation of second harmonic generations. This methodology can be used to develop nonlinear nanophotonic devices with multiple functionalities.
LASER & PHOTONICS REVIEWS
(2023)
Article
Astronomy & Astrophysics
Sergei M. Kuzenko, James La Fontaine, Michael Ponds
Summary: Recently, a N=1 superconformal higher-spin theory in four dimensions was proposed using the induced action approach. This paper initiates a program to compute perturbative corrections to the action and explicitly evaluates all quadratic terms. The standard techniques from superconformal field theory are employed for this purpose.
Article
Materials Science, Multidisciplinary
Jianghong Pan, Tinghui Li, Yun Shan
Summary: This study reveals that the spin-related electronic occupation at the catalyst surface is crucial in determining the acidic oxygen evolution reaction (OER) by influencing the bonding interaction and electron transfer with reactants. By surface engineering, a series of manganese spinel oxides with good acidic stability are suggested to regulate the catalytic activity, which strongly relies on the orbital splitting and electronic reconfiguration due to surface symmetry breaking. The analysis of electronic structure demonstrates that the magnetic moments of half-filled 3d metals at the surface layers are significantly larger than those at the internal region, resulting in higher catalytic activity in acidic OER. This work proposes a new strategy of enhancing catalytic activity through spin-related surface engineering.
PHYSICA STATUS SOLIDI-RAPID RESEARCH LETTERS
(2023)
Article
Materials Science, Multidisciplinary
Duo Zhao, Jiaqian Sun, Wei Tang, Yu-Jia Zeng
Summary: The Ising magnetoresistance induced by Ising spin-orbit coupling has significant importance in explaining unconventional observations and physical phenomena in low-symmetry two-dimensional materials.
Article
Chemistry, Multidisciplinary
Hao Wu, John Nance, Seyed Armin Razavi, David Lujan, Bingqian Dai, Yuxiang Liu, Haoran He, Baoshan Cui, Di Wu, Kin Wong, Kemal Sobotkiewich, Xiaoqin Li, Gregory P. Carman, Kang L. Wang
Summary: The study demonstrates that breaking chiral symmetry with anti-symmetric DMI can induce deterministic SOT switching. By introducing gradients of saturation magnetization or magnetic anisotropy, non-collinear dynamic spin textures are formed, breaking their chiral symmetry and enabling deterministic magnetization switching.
Article
Chemistry, Physical
Emily E. Morgan, Hayden A. Evans, Kartik Pilar, Craig M. Brown, Raphaele J. Clement, Ryo Maezono, Ram Seshadri, Bartomeu Monserrat, Anthony K. Cheetham
Summary: Natrium super ionic conductor (NASICON) compounds are a group of crystalline materials with high chemical tunability. They possess high ionic conductivity, low thermal expansion, and redox tunability, making them suitable candidates for various applications. Through the study of NaZr2(PO4)3 compound using neutron diffraction and solid-state NMR, as well as density functional theory-based calculations, the lattice dynamics of the crystal structure are found to play a crucial role in ion transport and thermal expansion.
CHEMISTRY OF MATERIALS
(2022)
Article
Chemistry, Multidisciplinary
Xiaotong Li, Mikael Kepenekian, Linda Li, Hao Dong, Constantinos C. Stoumpos, Ram Seshadri, Claudine Katan, Peijun Guo, Jacky Even, Mercouri G. Kanatzidis
Summary: The research on three-dimensional halide perovskites is limited by the choice of A-site cations. In this work, four new three-dimensional bromide perovskitoids incorporating linear organic diammonium cations are reported. These compounds exhibit similar electronic band structures and dynamic lattice characteristics to regular three-dimensional perovskites. Structures with smaller Pb-Br-Pb angles and larger octahedra distortion show broad photoluminescence at room temperature.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2022)
Article
Materials Science, Multidisciplinary
Justin A. Mayer, Ram Seshadri
Summary: Phase separation and solid-solution formation in half-Heusler and Heusler compounds are strongly linked to the electronic behavior of the end-members. Alloying is possible between isoelectronic or metallic end-members at accessible processing temperatures. The formation of a band gap in semiconducting half-Heusler compounds is associated with stabilization and attempts to create solid solutions with these compounds would lead to phase separation due to the energy penalty. Heusler compounds, on the other hand, can alloy even when the electronic behaviors of the end-members differ, highlighting the distinction between half-Heuslers and Heuslers.
PHYSICAL REVIEW MATERIALS
(2022)
Article
Nanoscience & Nanotechnology
Rebecca C. Vincent, Anthony K. Cheetham, Ram Seshadri
Summary: Oxides of molybdenum (MoOx) exhibit a diverse structural chemistry and varied redox behavior. Reduced Mo oxides, including MoO3 and MoO2, show promising potential as Li-ion battery electrode materials. The crystal structure of these oxides significantly impacts their battery performance, making them an important focus of study. By compiling electrochemical studies from 1971 to 2022, it is found that certain oxides display high reversible capacities for Li+ storage, but their redox voltages may hinder maximizing energy density when paired with other materials.
Article
Chemistry, Physical
Sun Woong Baek, Kira E. Wyckoff, Daniel D. Robertson, Matevz Frajnkovic, Yucheng Zhou, Sarah H. Tolbert, Ram Seshadri, Laurent Pilon
Summary: (W0.2V0.8)3O7 nanoparticles exhibit superior electrochemical performance compared to microparticles, as they undergo a two-phase coexistence over a narrower range of compositions and have a smaller irreversible heat generation rate. This is attributed to the fact that nanoparticles are less ionically resistive, able to accommodate more lithium, and have more kinetically favorable lithium-ion intercalation.
ACS APPLIED ENERGY MATERIALS
(2023)
Article
Chemistry, Physical
Eve M. Mozur, Ram Seshadri
Summary: Magnetic materials have significant applications in modern society and magnetic measurements provide essential information for a wide range of materials. Practical aspects of magnetic measurements require experience that cannot be obtained solely from textbooks and user manuals. This article aims to clarify magnetic measurements for nonexperts by discussing best practices and providing illustrative examples.
CHEMISTRY OF MATERIALS
(2023)
Article
Chemistry, Physical
Brian Dusolle, Veronique Jubera, Evgeniy S. Ilin, Patrick Martin, Gilles Philippot, Matthew R. . Suchomel, Bo B. Iversen, Samuel Marre, Cyril Aymonier
Summary: Extensive research on nanosized ZnO finds its optical properties challenging to control due to various possible defects producing emissions in the visible range. A low-temperature, supercritical-fluid-driven synthesis proposed by our group produces isotropic nanosized particles with a pure excitonic emission comparable to single crystals. This article reports the growth mechanism and optical properties of the excitonic emission, as well as its phonon coupling with the E2 high vibrational mode at liquid helium temperatures.
CHEMISTRY OF MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Austin D. Ready, Ahamed Irshad, Anna Kallistova, Moises Carrillo, Milan Gembicky, Ram Seshadri, Sri Narayan, Alexander M. Spokoyny
Summary: This work demonstrates the successful electrochemical cycling of a redox-active boron cluster-based material in the solid state. By designing and synthesizing a specific ether-functionalized dodecaborate cluster, the researchers were able to utilize it as a cathode active material in a PEO-based rechargeable all-solid-state cell. The cell exhibited high efficiency, reversibility, and minimal capacity fade after continuous cycling.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2023)
Article
Materials Science, Multidisciplinary
Simon A. Meynell, Yolita M. Eggeler, Joshua D. Bocarsly, Daniil A. Kitchaev, Bailey E. Rhodes, Tresa M. Pollock, Stephen D. Wilson, Anton Van der Ven, Ram Seshadri, Marc De Graef, Ania Bleszynski Jayich, Daniel S. Gianola
Summary: Magnetic skyrmions, topologically-protected spin textures, can transition between in-plane and out-of-plane orientations in certain ferromagnetic materials. Experimental evidence and numerical modeling in Co8Zn8Mn4 demonstrate the controllable flop transition between these two types of skyrmions at room temperature, with the transition dependent on thickness. Furthermore, the findings suggest potential applications in a skyrmion-writing device.
PHYSICAL REVIEW MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Greggory T. Kent, Emily Morgan, Kaitlin R. Albanese, Anna Kallistova, Alexandra Brumberg, Linus Kautzsch, Guang Wu, Pratap Vishnoi, Ram Seshadri, Anthony K. Cheetham
Summary: Halide double perovskites [A(2)M(I)M(III)X(6)] are important materials that have gained attention as non-toxic alternatives to lead iodide perovskites in optoelectronic applications. While chloride and bromide double perovskites have been extensively studied, the characterization of iodide double perovskites is rare. In this study, predictive models were used to synthesize and characterize five iodide double perovskites with the general formula Cs(2)NaLnI(6) (Ln=Ce, Nd, Gd, Tb, Dy). The complete crystal structures, structural phase transitions, optical, photoluminescent, and magnetic properties of these compounds are reported.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2023)
Article
Chemistry, Physical
Emily E. Morgan, Greggory T. Kent, Arava Zohar, Anthony O'Dea, Guang Wu, Anthony K. Cheetham, Ram Seshadri
Summary: We have reported hybrid and all-inorganic double perovskites of d(2) W4+ with the formula A(2)WCl(6) (A = CH3NH3+, Rb+, and Cs+), which can be distinguished from similar compounds obtained by hydrothermal methods based on structural, spectroscopic, and magnetic properties. The latter are green and incorporate oxygen, having the actual formula Cs2WO x Cl6-x and distinct optical absorption and emission behavior. The local-moment magnetism of the pure-red d(2) compounds reported here does not correspond to the appropriate Kotani model, suggesting undiscovered physics in these systems.
CHEMISTRY OF MATERIALS
(2023)
Article
Chemistry, Physical
Arava Zohar, Kira E. Wyckoff, Rebecca C. Vincent, Thomas E. Mates, Ram Seshadri
Summary: As the use of Li-ion batteries becomes more widespread, it is crucial to find new electrode materials with improved stability, power extraction, and charge/discharge capabilities. Early transition metals like Nb and Mo have potential as next-generation anode materials, but Mo oxides have limitations due to their intermediate redox voltages. This study explores the use of redox-inactive cations to lower the voltage and improve performance of Mo-based oxide anodes, demonstrating the potential of using inductive effects to tailor the operating voltage of candidate anode materials.
CHEMISTRY OF MATERIALS
(2023)
Article
Chemistry, Physical
Ashlea R. R. Patterson, Rodrigo Elizalde-Segovia, Kira E. E. Wyckoff, Arava Zohar, Patrick P. P. Ding, Wiley M. M. Turner, Kenneth R. R. Poeppelmeier, Sri R. R. Narayan, Raphaele J. Clement, Ram Seshadri, Kent J. Griffith
Summary: The structure and lithium insertion behavior of Wadsley-Roth-derived NaNb13O33 phase were studied. It exhibits high discharge rate and cycle life, making it a promising anode material for fast-charging and high-power lithium-ion batteries.
CHEMISTRY OF MATERIALS
(2023)
Article
Materials Science, Multidisciplinary
Yazan Badour, Sylvain Danto, Mathieu Gonidec, Christine Labrugere, Matthew R. Suchomel, Gilles Philippot, Manuel Gaudon
Summary: By tuning the oxygen substoichiometry of WO3 nano-powders, the photochromic properties can be optimized. In addition, WO3-x thin films fabricated using the dip-coating method exhibit excellent UV photoresponse and photoelectric characteristics.
Article
Chemistry, Multidisciplinary
Greggory T. Kent, Jiale Zhuang, Kaitlin R. Albanese, Arava Zohar, Emily Morgan, Anna Kallistova, Linus Kautzsch, Alexander A. Mikhailovsky, Pratap Vishnoi, Ram Seshadri, Anthony K. Cheetham
Summary: This study successfully synthesized five new hybrid iodide perovskites through a low-temperature solid-state synthesis method. These materials exhibit good structural, calorimetric, optical, photoluminescence, and magnetic properties.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2023)