Article
Materials Science, Multidisciplinary
K. Sonowal, D. V. Boev, A. V. Kalameitsev, V. M. Kovalev, I. G. Savenko
Summary: The band structure of monolayer MoS2 consists of spin-split subbands due to the presence of broken inversion symmetry and strong spin-orbit coupling. Surface acoustic waves induce strain-induced effective magnetic fields, leading to spin-flip transitions and the emergence of spin-acoustic resonance and acoustoelectric current. External magnetic fields break valley degeneracy and result in valley-selective splitting of spin-acoustic resonances in both surface acoustic wave absorption and acoustoelectric current.
Article
Multidisciplinary Sciences
Z. Wang, L. Balembois, M. Rancic, E. Billaud, M. Le Dantec, A. Ferrier, P. Goldner, S. Bertaina, T. Chaneliere, D. Esteve, D. Vion, P. Bertet, E. Flurin
Summary: Electron spin resonance spectroscopy is the preferred method for characterizing paramagnetic impurities, but it only provides ensemble-averaged quantities due to limited signal-to-noise ratio. To achieve single-electron spin sensitivity, we use spin fluorescence detection method and a microwave photon counter at millikelvin temperatures. By coupling individual paramagnetic erbium ions in a scheelite crystal to a high-quality-factor planar superconducting resonator to enhance their radiative decay rate, we obtain a fluorescence signal with a signal-to-noise ratio of 1.9 in one second integration time. This method has the potential for single-spin detection in a volume as large as the resonator magnetic mode volume, making it orders of magnitude larger than other single-spin detection techniques.
Article
Chemistry, Physical
Takashi Kobayashi, Joseph Salfi, Cassandra Chua, Joost van der Heijden, Matthew G. House, Dimitrie Culcer, Wayne D. Hutchison, Brett C. Johnson, Jeff C. McCallum, Helge Riemann, Nikolay Abrosimov, Peter Becker, Hans-Joachim Pohl, Michelle Y. Simmons, Sven Rogge
Summary: Strong spin-orbit coupling systems allow for electrically controlled spin qubits, with electron-spin qubits having long coherence times suitable for quantum technologies. Ultra-long coherence times of 10 ms have been demonstrated for strain-engineered hole states bound to boron acceptors in bulk silicon 28, promising to greatly improve spin qubit scalability and functionality. These results open up new possibilities for developing artificial quantum systems and enhancing the functionality and scalability of spin-based quantum technologies.
Article
Chemistry, Multidisciplinary
Ryo Kawaguchi, Katsushi Hashimoto, Toshiyuki Kakudate, Keiichi Katoh, Masahiro Yamashita, Tadahiro Komeda
Summary: The spintronic properties of magnetic molecules have been widely studied, especially in the context of qubits for quantum information processing. This study focuses on the role of the delocalized pi-radical electron spin in the Pc ligand in reading and intermediating the localized Tb spin qubits. Using electron spin resonance (ESR) technique with a scanning tunneling microscope (STM), the researchers were able to measure the local ESR of a single TbPc2 molecule decoupled from the Cu(100) substrate by a two-monolayer NaCl film. The results indicate that the pi-radical electron is delocalized within the ligands and exhibits intramolecular coupling susceptible to the chemical environment.
Article
Chemistry, Multidisciplinary
Xue Zhang, Christoph Wolf, Yu Wang, Herve Aubin, Tobias Bilgeri, Philip Willke, Andreas J. Heinrich, Taeyoung Choi
Summary: This article introduces the technique of combining scanning tunneling microscopy with electron spin resonance spectroscopy to measure the spin of individual atoms and explores the spin distribution of iron phthalocyanine complexes on a surface and the magnetic interactions between molecular spins.
Article
Physics, Applied
Gabriele Clemente, Massimo Moret, Andres Granados del Aguila, Muhammad Hussain, Zdenek Sofer, Jiayuan Zhou, Xue Liu, Marco Fanciulli, Fabrizio Moro
Summary: In this study, the electron spin resonance (ESR) properties of a van der Waals bulk CrBr3 single crystal were investigated. Angular- and temperature-dependent experiments were conducted in the range of the critical temperature for ferromagnetic order. The results revealed a strong uniaxial magnetic anisotropy constant and the occurrence of long wavelength spin fluctuations. The findings have implications for the potential application of CrBr3 in perpendicular magnetic tunneling junctions.
JOURNAL OF APPLIED PHYSICS
(2023)
Article
Physics, Applied
Masahiro Hori, Yukinori Ono
Summary: The study uses gate pulse-induced spin-dependent recombination in silicon MOS transistors to detect signals from arsenic (As) donors. Analysis suggests that the detection is due to the spin pairs formed by an As donor electron spin and an electron spin of a defect center at the MOS SiO2/Si interface, and their spin-dependent process during recombination.
APPLIED PHYSICS LETTERS
(2021)
Article
Materials Science, Multidisciplinary
A. A. Wood, R. M. Goldblatt, R. P. Anderson, L. C. L. Hollenberg, R. E. Scholten, A. M. Martin
Summary: The interaction between central qubit spin and surrounding bath of spins is crucial for quantum sensing and quantum information processing. By rotating a diamond at speeds up to 300,000 rpm, researchers have found that the interaction between electron spins of nitrogen-vacancy centers and a bath of C-13 nuclear spins introduces decoherence into the system. These findings offer new insights into using physical rotation for quantum control in systems with motional and rotational degrees of freedom.
Article
Multidisciplinary Sciences
Lei Qin, Hao-Lan Zhang, Yuan-Qi Zhai, Hiroyuki Nojiri, Christian Schroeder, Yan-Zhen Zheng
Summary: The study demonstrates the formation of antiferromagnetic interaction in Cr(III)-RE (rare earth) clusters, resulting in 96 parallel electrons forming a ground spin state of 48 for RE = Gd. Using classical Monte Carlo simulation, the exchange coupling constants J(ij) can be determined, and spin dynamics simulation shows the strong Zeeman effects stabilizing the ground ferrimagnetic state.
Article
Physics, Multidisciplinary
Daejin Eom, Ja-Yong Koo
Summary: Paramagnetic centers are generated on a heavily boron-doped Si(111) surface using a scanning tunneling microscope, mediating the spin-dependent recombination of bound holes of the boron acceptor. This process, affected by spin-orbit coupling, offers a promising candidate for implementing position-controlled impurity qubits with an electrical readout mechanism in silicon.
PHYSICAL REVIEW LETTERS
(2021)
Article
Chemistry, Physical
Nathan Chejanovsky, Amlan Mukherjee, Jianpei Geng, Yu-Chen Chen, Youngwook Kim, Andrej Denisenko, Amit Finkler, Takashi Taniguchi, Kenji Watanabe, Durga Bhaktavatsala Rao Dasari, Philipp Auburger, Adam Gali, Jurgen H. Smet, Joerg Wrachtrup
Summary: This study reports on optically detected magnetic resonance of a single defect in hexagonal boron nitride, identifying isolated optical emitters with certain unique properties and characteristics.
Article
Chemistry, Inorganic & Nuclear
Laxmi Devkota, Daniel J. SantaLucia, Amelia M. Wheaton, Alexander J. Pienkos, Sergey V. Lindeman, J. Krzystek, Mykhaylo Ozerov, John F. Berry, Joshua Telser, Adam T. Fiedler
Summary: The observation of single-molecule magnetism in transition-metal complexes relies on the phenomenon of zero-field splitting, which arises from the interplay of spin-orbit coupling with ligand-field-induced symmetry lowering. The heavy-atom effect in high-spin cobalt(II)-halide complexes was systematically studied in this study, where the magnitude of zero-field splitting was investigated through various techniques. The role of molecular geometry, ligand-field effects, and metal-ligand covalency in controlling the magnitude of zero-field splitting in cobalt-halide complexes was revealed through interpretation of the magnetic parameters.
INORGANIC CHEMISTRY
(2023)
Article
Chemistry, Multidisciplinary
Sujit Das, Valentyn Laguta, Katherine Inzani, Weichuan Huang, Junjie Liu, Ruchira Chatterjee, Margaret R. McCarter, Sandhya Susarla, Arzhang Ardavan, Javier Junquera, Sinead M. Griffin, Ramamoorthy Ramesh
Summary: Solid-state materials are being explored as a platform for spin manipulation and quantum information science, and ferroelectric materials provide an alternative method to explore spin quantum phenomena. Experimental results using a model system demonstrate the intrinsic spin-polarization control of spins in complex ferroelectric vortex structures.
Article
Physics, Multidisciplinary
Timo Frauhammer, Hongyan Chen, Timofey Balashov, Gabriel Derenbach, Svetlana Klyatskaya, Eufemio Moreno-Pineda, Mario Ruben, Wulf Wulfhekel
Summary: In this study, the indirect readout of the Dy magnetic moment in Bis(phthalocyaninato)dysprosium (DyPc2) molecules on Au(111) was successfully achieved using milli-Kelvin scanning tunneling microscopy. By observing the unpaired electron on the exposed Pc ligand, the molecules exhibited a Kondo resonance that was split by the ferromagnetic exchange interaction between the unpaired electron and the Dy angular momentum. Using spin-polarized scanning tunneling spectroscopy, the Dy magnetic moment was read out as a function of the applied magnetic field, exploiting the spin polarization of the exchange-split Kondo state.
PHYSICAL REVIEW LETTERS
(2021)
Article
Multidisciplinary Sciences
Marianne Le Dantec, Milos Rancic, Sen Lin, Eric Billaud, Vishal Ranjan, Daniel Flanigan, Sylvain Bertaina, Thierry Chaneliere, Philippe Goldner, Andreas Erb, Ren Bao Liu, Daniel Esteve, Denis Vion, Emmanuel Flurin, Patrice Bertet
Summary: By selecting a host matrix with low nuclear-spin density (CaWO4) and quenching spectral diffusion at millikelvin temperatures, a 23-ms coherence time on Er3+ electron spin transition has been achieved, establishing Er3+:CaWO4 as a potential platform for quantum networks.
Article
Chemistry, Inorganic & Nuclear
Jean-Pierre Costes, Carine Duhayon, Laure Vendier, Wolfgang Wernsdorfer
Summary: A chiral trianionic ligand reacted with Cu-II ions to form anionic [LCu](-) units, which crystallized as infinite 1D zig-zag chains. The reaction with Ln(III) ions resulted in the formation of tetranuclear complexes. The presence of Ln(III) ions affected the stereochemistry of the [LCu](-) units. The structural determinations showed the presence of a symmetry centre except for the methyl groups linked to the chiral carbon atoms.
DALTON TRANSACTIONS
(2022)
Article
Chemistry, Inorganic & Nuclear
William J. M. Blackaby, Katie L. M. Harriman, Samuel M. Greer, Andrea Folli, Stephen Hill, Vera Krewald, Mary F. Mahon, Damien M. Murphy, Muralee Murugesu, Emma Richards, Elizaveta Suturina, Michael K. Whittlesey
Summary: A new series of homoleptic Ni(I) bis-N-heterocyclic carbene complexes with different torsion angles between the ligands have been reported. The complexes exhibit a strongly anisotropic g-tensor and the first excited state energy ranges from 270 to 650 cm(-1). The magnetic relaxation is dominated by Raman and direct processes, and the temperature dependence of the relaxation does not correlate with the torsion angle.
INORGANIC CHEMISTRY
(2022)
Article
Multidisciplinary Sciences
Jon G. C. Kragskow, Jonathan Marbey, Christian D. Buch, Joscha Nehrkorn, Mykhaylo Ozerov, Stergios Piligkos, Stephen Hill, Nicholas F. Chilton
Summary: The coupling between vibrations and electronic spins, known as vibronic coupling, has a significant impact on the spin state lifetime in molecular magnets and qubits. This study presents direct measurements of vibronic transitions in a molecular magnet, highlighting the critical role of an envelope effect in the spectra. The research shows that vibronic coupling is strongest for vibrational modes that distort the first coordination sphere and break the C-3 symmetry of the molecule, providing new insights towards controlling vibronic coupling in molecules.
NATURE COMMUNICATIONS
(2022)
Article
Chemistry, Multidisciplinary
Krishnendu Kundu, Jessica R. K. White, Samuel A. Moehring, Jason M. Yu, Joseph W. Ziller, Filipp Furche, William J. Evans, Stephen Hill
Summary: By controlling the degree of s-orbital mixing in molecules, a large spin hyperfine interaction can be achieved, leading to a 9 GHz clock transition and increased phase memory time. These findings suggest new strategies for the development of molecular quantum technologies.
Article
Chemistry, Inorganic & Nuclear
Mateus S. de Souza, Samira G. Reis, Danilo Stinghen, Livia B. L. Escobar, Rafael A. . Allao Cassaro, Giordano Poneti, Carolina S. Bortolot, Jonathan Marbey, Stephen Hill, Maria G. F. Vaz
Summary: In this study, three new 2p-3d heterospin complexes were synthesized and their structures were analyzed using single crystal X-ray diffraction data. The magnetic and EPR spectroscopy investigations revealed different ferromagnetic and antiferromagnetic properties of these complexes.
INORGANIC CHEMISTRY
(2022)
Article
Chemistry, Multidisciplinary
Christian D. Buch, Krishnendu Kundu, Jonathan J. Marbey, Johan van Tol, Hogni Weihe, Stephen Hill, Stergios Piligkos
Summary: In this study, multifrequency electron paramagnetic resonance spectroscopy was used to investigate the behavior of Gd(III) ions in Gd0.004Y0.996(trensal) single crystals, and the Hamiltonian parameters of the ground state and the phase memory time, Tm, characterizing its coherent spin dynamics were determined.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2022)
Article
Chemistry, Multidisciplinary
Malay Dolai, Surajit Biswas, Eufemio Moreno-Pineda, Wolfgang Wernsdorfer, Mahammad Ali, Razan A. Alshgari, Saikh Md. Wabaidur, Ashutosh Ghosh
Summary: Two dinuclear complexes were synthesized and characterized, and their catalytic activity in the carbon dioxide insertion reaction into epoxides for the formation of organic cyclic carbonates was studied. The complexes showed efficient catalytic activity with high yields and turnover numbers.
CRYSTAL GROWTH & DESIGN
(2023)
Article
Chemistry, Physical
D. Rieger, S. Guenzler, M. Spiecker, P. Paluch, P. Winkel, L. Hahn, J. K. Hohmann, A. Bacher, W. Wernsdorfer, I. M. Pop
Summary: By using a self-structured aluminum nanojunction, a nonlinearity medium can be formed between superconducting electrodes, acting as a replacement for Josephson junctions. The new type of qubit, gralmonium, exhibits similar performance to the traditional fluxonium qubit, but the lack of a mesoscopic parallel plate capacitor leads to a significantly larger charging energy for the aluminum nanojunction, providing a powerful diagnostic tool for microscopic defects in superconducting materials.
Article
Chemistry, Inorganic & Nuclear
Gheorghe Taran, Edgar Bonet, Eufemio Moreno-Pineda, Mario Ruben, Wolfgang Wernsdorfer
Summary: Through numerical simulation, we find that phonon-modulated hyperfine interaction opens a direct relaxation channel between the nuclear spins and the phonon bath. The mechanism is of potential importance for the theory of spin bath and the relaxation dynamics of the molecular spins.
INORGANIC CHEMISTRY
(2023)
Article
Chemistry, Physical
Yifan Quan, Manoj V. H. Subramanya, Yifu Ouyang, Michael Mardini, Thierry Dubroca, Stephen Hill, Robert G. Griffin
Summary: This paper presents a study on coherent dynamic nuclear polarization (DNP) using frequency swept pulses at 94 GHz to optimize the polarization transfer efficiency. An enhancement of approximately 496 was observed using 10 mM trityl-OX063 as the polarizing agent in a standard 6:3:1 d (8)-glycerol/D2O/H2O glassing matrix at 70 K, which is currently the largest reported DNP enhancement at this microwave frequency and temperature. Furthermore, the frequency swept pulses enhance the nuclear magnetic resonance (NMR) signal and reduce the recycle delay, accelerating the NMR signal acquisition.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2023)
Article
Chemistry, Inorganic & Nuclear
Ting-Ting Ruan, Eufemio Moreno-Pineda, Michael Schulze, Soeren Schlittenhardt, Thomas Brietzke, Hans-Jurgen Holdt, Senthil Kumar Kuppusamy, Wolfgang Wernsdorfer, Mario Ruben
Summary: This article describes two dysprosium-based isotopologues and investigates their magnetic properties. The study found that shorter distances between Dy(III) are crucial for creating Qudits with enlarged Hilbert spaces.
INORGANIC CHEMISTRY
(2023)
Article
Physics, Applied
D. Rieger, S. Guenzler, M. Spiecker, A. Nambisan, W. Wernsdorfer, I. M. Pop
Summary: Resonator measurements are a powerful tool for characterizing a material's microwave response. The losses of a resonant mode can be quantified by its internal quality factor Qi, which can be affected by Fano interference. Limited knowledge of interfering paths in a setup leads to uncertainty in Qi, increasing with the coupling coefficient. This study demonstrates the relevance of Fano interference in microwave resonator measurements and provides insight into eliminating systematic errors.
PHYSICAL REVIEW APPLIED
(2023)
Article
Chemistry, Inorganic & Nuclear
Niki Mavragani, Alexandros A. Kitos, Jakub Hruby, Stephen Hill, Akseli Mansikkamaki, Jani O. Moilanen, Muralee Murugesu
Summary: A new series of radical-bridged dinuclear lanthanide metallocenes were synthesized by combining high-performing lanthanide metallocenes and tetrazine-based radical ligands. The formation of radical species was confirmed by various techniques. The choice of ancillary ligands and the steric effects played a crucial role in promoting stronger magnetic exchange coupling and achieving slow relaxation of the magnetization.
INORGANIC CHEMISTRY FRONTIERS
(2023)
Article
Materials Science, Multidisciplinary
Artur Pambukhchyan, Sizhe Weng, Indu Aravind, Stephen B. Cronin, Susumu Takahashi
Summary: This study discusses the charge state dynamics of NV and SiV centers under high-voltage nanosecond pulse discharges, and finds that high-voltage pulses can efficiently manipulate their charge state changes. The research results also indicate that the major population of SiV centers in the sample is the doubly negatively charged state.
MATERIALS FOR QUANTUM TECHNOLOGY
(2023)
Article
Chemistry, Inorganic & Nuclear
Konstantinos Karachousos-Spiliotakopoulos, Vassilis Tangoulis, Nikos Panagiotou, Anastasios Tasiopoulos, Eufemio Moreno-Pineda, Wolfgang Wernsdorfer, Michael Schulze, Alexandre M. P. Botas, Luis D. Carlos
Summary: The complex [YbCo(CN)6(bpyO2)2(H2O)3]·4H2O synthesized from the reaction of YbCl3·6H2O, K-3[Co(CN)6], and bpyO2 has been characterized and shown to exhibit field-induced single molecule magnet behavior and high-temperature luminescence sensitivity.
DALTON TRANSACTIONS
(2022)
