Article
Materials Science, Multidisciplinary
Arun Parthasarathy, Egecan Cogulu, Andrew D. Kent, Shaloo Rakheja
Summary: This study discusses the precession and stability of the Neel order of antiferromagnets subjected to spin torque, focusing on the requirements for in-plane and normal components of spin polarization. The precessional motion is described as a damped-driven pendulum with hysteresis, showing critical values and frequency dependencies on the spin current.
Article
Physics, Multidisciplinary
Mohamad Niknam, Md. Fahim F. Chowdhury, Md Mahadi Rajib, Walid Al Misba, Robert N. Schwartz, Kang L. Wang, Jayasimha Atulasimha, Louis-S. Bouchard
Summary: This paper introduces a technique for addressing spin qubits using voltage control of nanoscale magnetism. The authors demonstrate that by tuning the frequency and phase, high-fidelity single-qubit quantum gate operations can be achieved with low energy consumption and lossless magnetic field control.
COMMUNICATIONS PHYSICS
(2022)
Article
Chemistry, Multidisciplinary
Hao-Lan Zhang, Yuan-Qi Zhai, Hiroyuki Nojiri, Christian Schroeder, Hung-Kai Hsu, Yi-Tsu Chan, Zhendong Fu, Yan-Zhen Zheng
Summary: This study presents a method for spin wave excitation using heterometallic rings and predicts spin wave excitations at different temperatures. The study finds that antiferromagnetic exchange, dipole-dipole interaction, and ring topology play important roles in spin wave excitations at low temperatures.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2022)
Review
Physics, Condensed Matter
A. Podlesnyak, S. E. Nikitin, G. Ehlers
Summary: Recent studies on spin dynamics in rare-earth orthorhombic perovskite oxides were reviewed using single-crystal inelastic neutron scattering. The identity of the rare-earth ion strongly influences the ground state and low-energy excitations, leading to different magnetic field-temperature phase diagrams and quantum spin states. The observation of fractional spinon continuum and quantum criticality highlights the potential of Kramers rare-earth based magnets in realizing various aspects of quantum low-dimensional physics.
JOURNAL OF PHYSICS-CONDENSED MATTER
(2021)
Article
Physics, Multidisciplinary
Guochu Deng, Gang Zhao, Shuang Zhu, Zhenjie Feng, Wei Ren, Shixun Cao, Andrew Studer, Garry J. McIntyre
Summary: The spin dynamics of Mn4Nb2O9 were studied using inelastic neutron scattering, and a dynamic model was proposed to explain the observed spin-wave excitation spectrum. The study showed that the spin dynamics of this compound are dominated by antiferromagnetic interactions on the two MnO6 octahedron networks, and a spin gap and magnetic critical scattering were observed.
NEW JOURNAL OF PHYSICS
(2022)
Article
Materials Science, Multidisciplinary
Yuehua Su, Shengyan Wang, Chao Zhang
Summary: This paper proposes a technique called coincidence inelastic neutron scattering (cINS) to detect two-spin magnetic correlations of magnetic materials, which goes beyond the direct detection capability of traditional inelastic neutron scattering (INS).
Article
Materials Science, Multidisciplinary
V. K. Bhartiya, S. Hayashida, K. Yu Povarov, Z. Yan, Y. Qiu, S. Raymond, A. Zheludev
Summary: In this study, single crystal inelastic neutron scattering was used to investigate spin-wave excitations in the fully polarized state of the frustrated quantum ferroantiferromagnet BaCdVO(PO4)(2). By fitting all eight exchange constants simultaneously to data from over 150 scans, a definitive quantitative model of the material was established, which was found to be substantially different from previous assumptions based on powder experiments.
Article
Physics, Condensed Matter
Tao Xie, Chang Liu, Ryoichi Kajimoto, Kazuhiko Ikeuchi, Shiliang Li, Huiqian Luo
Summary: In this study, time-of-flight inelastic neutron scattering (INS) was used to investigate the spin fluctuation spectrum in the 112-type iron-based superconductor Ca0.82La0.18Fe0.96Ni0.04As2 (CaLa-112). The results showed that in-plane dispersions and the bandwidth of spin excitations in CaLa-112 closely resemble those in 122 systems. While the total fluctuating moments were larger in CaLa-112, the dynamic correlation lengths were similar, suggesting a common magnetic origin for superconductivity in iron arsenides.
JOURNAL OF PHYSICS-CONDENSED MATTER
(2022)
Article
Multidisciplinary Sciences
Qiyang Sun, Bin Wei, Yaokun Su, Hillary Smith, Jiao Y. Y. Lin, Douglas L. Abernathy, Chen Li
Summary: The study investigates the impact of spin-phonon coupling on the phonon system through experiments and calculations. Anomalous scattering spectral intensity is identified in antiferromagnetic nickel (II) oxide, revealing strong spin-lattice correlations. Magnetic scattering signature is observed in acoustic phonons, and a modified scattering cross-section model is proposed.
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
(2022)
Article
Materials Science, Multidisciplinary
H. Lane, E. Pachoud, J. A. Rodriguez-Rivera, M. Songvilay, G. Xu, P. M. Gehring, J. P. Attfield, R. A. Ewings, C. Stock
Summary: VI3 is a ferromagnet with planar honeycomb sheets of bonded V3+ ions held together by van der Waals forces. Neutron spectroscopy is applied to measure two-dimensional magnetic excitations in the ferromagnetic phase. The study reveals the mechanism of magnetic anisotropy in VI3, providing insights into its spatially long-ranged two-dimensional ferromagnetism.
Article
Physics, Multidisciplinary
Shang Gao, Ganesh Pokharel, Andrew F. May, Joseph A. M. Paddison, Chris Pasco, Yaohua Liu, Keith M. Taddei, Stuart Calder, David G. Mandrus, Matthew B. Stone, Andrew D. Christianson
Summary: This study uses spectral graph theory to approximate spiral spin liquids on a bipartite lattice and broadens the range of candidate materials that may support spiral spin liquid phases. Neutron scattering experiments on two compounds demonstrate the feasibility of this new approach and reveal potential limitations in experimental realizations.
PHYSICAL REVIEW LETTERS
(2022)
Article
Physics, Multidisciplinary
Shang Gao, Michael A. McGuire, Yaohua Liu, Douglas L. Abernathy, Clarina dela Cruz, Matthias Frontzek, Matthew B. Stone, Andrew D. Christianson
Summary: Using neutron scattering, a spiral spin liquid has been realized in the van der Waals honeycomb magnet FeCl3. A continuous ring of scattering is directly observed, indicating the emergence of an approximate U(1) symmetry in momentum space.
PHYSICAL REVIEW LETTERS
(2022)
Article
Materials Science, Multidisciplinary
Xiao Yuan, Peter S. Riseborough
Summary: Spin-excitons are sharp branches of dispersive triplet excitations found within the gap of paramagnetic Kondo Insulators. The application of a high applied magnetic field can destabilize the non-magnetic Kondo Insulating state through different routes depending on the strength of quasi-particle interactions: a transition to a field-induced antiferromagnetic state for strong interactions, and the closure of the hybridization gap for weak interactions. This study examines the effects of an applied magnetic field on spin-excitons, showing that they split into three branches proportional to the applied field, with the lowest-energy branch disappearing at the transition to the antiferromagnetic phase.
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
(2023)
Article
Physics, Applied
O. Stockert, F. Steglich
Summary: Heavy-fermion superconductors, historically discovered unconventional superconductors, serve as model systems for high-Tc superconductors. This review discusses the existence of a spin resonance in the superconducting state and its implications in heavy-fermion superconductors.
PHYSICA C-SUPERCONDUCTIVITY AND ITS APPLICATIONS
(2023)
Article
Materials Science, Multidisciplinary
Keith M. Taddei, Bing-Hua Lei, Michael A. Susner, Hui-Fei Zhai, Thomas J. Bullard, Liurukara D. Sanjeewa, Qiang Zheng, Athena S. Sefat, Songxue Chi, Clarina dela Cruz, David J. Singh, Bing Lv
Summary: Majorana zero modes form as intrinsic defects in an odd-orbital one-dimensional superconductor, thus motivating the search for such materials in the pursuit of Majorana physics. We present experimental results and calculations suggesting that K2Cr3As3 is a quasi-one-dimensional superconductor with spin triplet behavior, making it a potential topological superconductor.
Article
Chemistry, Physical
A. Chiesa, F. Petiziol, M. Chizzini, P. Santini, S. Carretta
Summary: In this study, we identified the key factors affecting decoherence in multispin clusters and designed optimal molecules embedded with quantum error correction. By optimizing the error correction code, we significantly enhanced the power of quantum error correction, resulting in a dramatic suppression of decoherence in the system. Through a complete simulation of system dynamics, we demonstrated the effectiveness of this approach.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2022)
Article
Chemistry, Multidisciplinary
Javier Rubin, Ana Arauzo, Elena Bartolome, Francesco Sedona, Marzio Rancan, Lidia Armelao, Javier Luzon, Tatiana Guidi, Elena Garlatti, Fabrice Wilhelm, Andrei Rogalev, Andreas Amann, Stefano Spagna, Juan Bartolome, Fernando Bartolome
Summary: This article investigates the magnetic behavior of the molecular wheel {Cr-10}, which exhibits unusual intermediate total spin and significant cluster anisotropy. The authors confirm the axial anisotropic behavior of {Cr-10} through angular magnetometry measurements and propose a model to explain its magnetic behavior. They also find that the small-angle distortions in the Cr-O-Cr alkoxy bridges of the molecule lead to the asymmetry in molecular interactions.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2022)
Article
Engineering, Environmental
Olwen Stagg, Katherine Morris, Luke Thomas Townsend, Kristina O. Kvashnina, Michael L. Baker, Ryan L. Dempsey, Liam Abrahamsen-Mills, Samuel Shaw
Summary: Over 60 years of nuclear activity have led to a global issue of contaminated land and radioactive waste, with uranium being a significant component. This study demonstrates that iron (oxyhydr)oxides can act as a long-term barrier to uranium migration in the environment. Despite a transient release of uranium ions during sulfidation, uranium overall remains in the solid phase. On reoxidation, uranium associates with iron (oxyhydr)oxide, either as adsorbed uranyl or incorporated uranium species. These findings support the concept of iron (oxyhydr)oxides acting as a barrier to uranium migration even under fluctuating redox conditions.
ENVIRONMENTAL SCIENCE & TECHNOLOGY
(2022)
Article
Chemistry, Multidisciplinary
Alessandro Chiesa, Alberto Privitera, Emilio Macaluso, Matteo Mannini, Robert Bittl, Ron Naaman, Michael R. Wasielewski, Roberta Sessoli, Stefano Carretta
Summary: Molecular spins are potential building blocks for future quantum technologies due to the flexibility provided by chemistry. However, their weak interaction with external stimuli makes it difficult to access their state at the single-molecule level. A solution using the chirality-induced spin selectivity effect on electron transfer processes is envisioned, which enables initialization, manipulation, and single-spin readout of molecular qubits and qudits even at relatively high temperatures.
ADVANCED MATERIALS
(2023)
Article
Multidisciplinary Sciences
E. Garlatti, A. Albino, S. Chicco, V. H. A. Nguyen, F. Santanni, L. Paolasini, C. Mazzoli, R. Caciuffo, F. Totti, P. Santini, R. Sessoli, A. Lunghi, S. Carretta
Summary: Understanding phonon-induced relaxation in molecular qubits is crucial for their application potential. Garlatti et al. utilize inelastic X-ray scattering and density functional theory to investigate the role of low-energy phonons on spin relaxation in a prototypical molecular qubit. They find that intra-molecular vibrations with very-low energies are largely responsible for spin relaxation up to ambient temperature. This research provides insights into improving spin coherence and opens new avenues for the investigation of magnetic molecules for quantum devices.
NATURE COMMUNICATIONS
(2023)
Article
Multidisciplinary Sciences
Pritam Sadhukhan, Shu-Qi Wu, Shinji Kanegawa, Sheng-Qun Su, Xiaopeng Zhang, Takumi Nakanishi, Jeremy Ian Long, Kaige Gao, Rintaro Shimada, Hajime Okajima, Akira Sakamoto, Joy G. Chiappella, Myron S. Huzan, Thomas Kroll, Dimosthenis Sokaras, Michael L. Baker, Osamu Sato
Summary: Energy harvesting by utilizing optical control has emerged as a promising solution to alleviate energy and environmental crisis. However, it is challenging to realize nano-scale energy storage and conversion in the same material. Here the authors report a nonferroelectric molecular [CoGa] crystal that uses light as an external stimulus to exhibit photoenergy conversion and energy storage properties.
NATURE COMMUNICATIONS
(2023)
Article
Physics, Applied
A. Chiesa, S. Roca, S. Chicco, M. C. de Ory, A. Gomez-Leon, A. Gomez, D. Zueco, F. Luis, S. Carretta
Summary: In this study, a blueprint of a molecular spin quantum processor is presented, which uses molecular spins as qudits. The performance of this platform is evaluated through numerical simulations, showing the feasibility of the molecular route towards a universal quantum processor.
PHYSICAL REVIEW APPLIED
(2023)
Article
Chemistry, Physical
Emilio Macaluso, Alessandro Chiesa, Paolo Santini, Robert Bittl, Stefano Carretta
Summary: Investigating the role of chiral-induced spin selectivity in the generation of spin correlated radical pairs in a photoexcited donor-chiral bridge-acceptor system is fundamental to exploit it in quantum technologies. This requires a minimal master equation description of both charge separation and recombination through a chiral bridge. To achieve this without adding complexity and entering in the microscopic origin of the phenomenon, we investigate the implications of spin-polarizing reaction operators to the master equation. The explicit inclusion of coherent evolution yields non-trivial behaviors in the charge and spin dynamics of the system. Finally, we apply this master equation to a setup comprising a molecular qubit attached to the donor-bridge-acceptor molecule, enabling qubit initialization, control, and read-out. Promising results are found by simulating this sequence of operations assuming realistic parameters and achievable experimental conditions.
JOURNAL OF CHEMICAL PHYSICS
(2023)
Article
Chemistry, Multidisciplinary
Augustin Braun, Leland B. Gee, Michael W. Mara, Ethan A. Hill, Thomas Kroll, Dennis Nordlund, Dimosthenis Sokaras, Pieter Glatzel, Britt Hedman, Keith O. Hodgson, A. S. Borovik, Michael L. Baker, Edward I. Solomon
Summary: Fe K-edge XAS is widely used for studying high-valent iron intermediates in catalysts. The 4p-mixing into the 3d orbitals complicates the analysis, but understanding it correctly enables deeper insights into the structure and reactivity. This study reveals that the loss of inversion in the equatorial plane leads to 4p mixing into the 3dx2-y2,xy orbitals, providing structural insights for distinguishing 6- vs 5-coordinate active sites. Furthermore, the study investigates the electronic structure of Fe(IV)=O active sites and their reactivity selectivity through O K-edge XAS.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2023)
Article
Physics, Multidisciplinary
M. Chizzini, L. Crippa, A. Chiesa, F. Tacchino, F. Petiziol, I Tavernelli, P. Santini, S. Carretta
Summary: This study demonstrates that artificial molecular spins can serve as powerful units in future quantum computing architectures. The characteristics of multispin molecules allow for the implementation of complex operations with high fidelity due to the strong suppression of decoherence. Numerical simulations showcase the capability of this approach in implementing one- and two-qudit gates on realistic molecular systems.
PHYSICAL REVIEW RESEARCH
(2022)
Article
Chemistry, Physical
Mario Chizzini, Luca Crippa, Luca Zaccardi, Emilio Macaluso, Stefano Carretta, Alessandro Chiesa, Paolo Santini
Summary: Molecular spin systems are a promising platform for quantum computing due to their ability to be manipulated coherently at many levels. This study compares the implementation of a spin qudit-based code on different molecules, showing that pulse-shaping techniques can improve the effective phase memory time and reduce decoherence. The simulation also demonstrates the implementation of single-qubit operations on encoded states.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2022)
Article
Physics, Fluids & Plasmas
Daniele Colognesi, Ubaldo Bafile, Eleonora Guarini, Tatiana Guidi, Martin Neumann
Summary: This paper presents a combined neutron scattering and quantum simulation study of the collective dynamics in liquid Ne-D2 mixtures. The study finds a general agreement between the dynamic structure factor for the centers of mass of the two molecular species obtained from neutron scattering data and that obtained from three different quantum simulation methods. An analysis of the longitudinal current spectral maxima reveals the peculiarities of the D2 center-of-mass dynamics in these mixtures.
