Article
Chemistry, Physical
Thomas M. Fuchs, Rolf Schaefer
Summary: The magnetic double deflection experiments reveal the impact of nuclear spins on electron spin coherence in isolated AlSn12 clusters, and discuss the superatomic response of nuclear spins in the endohedral cage clusters. By varying the concentration of nuclear spins in the tin cage using isotopically enriched tin samples, the study delves into hyperfine interaction, nuclear spin statistics, and spin dynamics. Furthermore, it is demonstrated that state-interference in the multistate Landau-Zener system AlSn12 explains the significant increase in spin decoherence with the presence of one or two nuclear spins in the cluster.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2021)
Article
Chemistry, Multidisciplinary
Soyoung Park, Hang Chen, Satoshi Hiura, Junichi Takayama, Kazuhisa Sueoka, Akihiro Murayama
Summary: This study demonstrates electric-field-effect spin switching using p-doped semiconductor quantum dots, enhancing the number of highly polarized electron and photon spins. The spin direction can be controlled by the strength and direction of the electric field, with optimized p-doping leading to fast spin reversals under moderate electric field application. Excess hole doping hinders efficient spin reversal due to multiple electron-hole spin scattering and a spin-state filling effect during the spin injection process.
Article
Materials Science, Multidisciplinary
Canzhu Tan, Xiaodong Lin, Yabing Zhou, Yuhai Jiang, Matthias Weidemueller, Bing Zhu
Summary: Theoretical study of magnetization relaxation in Ising spins with soft-core two-body interaction potential in homogeneous and Gaussian profiles reveals different dynamics between the two cases, with an oscillating behavior and stretched-exponential law observed in the former and coherent manybody dynamics in the latter. The system's disorder level can be controlled by the interspin distance ratio, impacting the magnetization dynamics. Different asymptotic evolution behaviors are observed in different disorder limit scenarios, with stretched exponent values varying from 0.18 to 0.5.
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
Materials Science, Multidisciplinary
P. Schultzen, T. Franz, S. Geier, A. Salzinger, A. Tebben, C. Hainaut, G. Zuern, M. Weidemuller, M. Gaerttner
Summary: In this study, we investigate the out-of-equilibrium dynamics of a quantum Ising model with power-law interactions and positional disorder. We analytically find a stretched exponential decay of the global magnetization and ensemble-averaged single-spin purity, and confirm the persistence of glassy behavior numerically. We identify the dephasing between disordered coherent pairs as the main mechanism for the relaxation of global magnetization, while genuine many-body interactions lead to a loss of single-spin purity and the build-up of entanglement. This study extends prior findings in classical and open quantum systems to both integrable and nonintegrable quantum systems.
Article
Physics, Multidisciplinary
E. Sauter, N. Abrosimov, J. Huebner, M. Oestreich
Summary: The study demonstrates that the spin relaxation times in Si-28:P can exceed 20 hours at low temperatures, showing promising performance. The spin relaxation in Si-28:P exhibits a linear dependence on temperature and a transition to a T-9 dependence, different from natural silicon. At high magnetic fields, the spin relaxation is mainly governed by the magnetic field dependent single phonon spin relaxation process.
PHYSICAL REVIEW LETTERS
(2021)
Article
Chemistry, Physical
Gaurav Pandey, Sandip Ghosh, Ashwani K. Tiwari
Summary: We performed a study on the electron-nuclear dynamics of H-2(+) molecular ions under the influence of an intense laser pulse. Both quantum and classical methods were used for comparison, and the competition between ionization and dissociation channels was explained. The origin of electron localization was elucidated through observing the evolution pattern of molecular and electronic wave packets.
JOURNAL OF PHYSICAL CHEMISTRY A
(2023)
Article
Physics, Condensed Matter
Kilian Irlander, Heinz-Juergen Schmidt, Jurgen Schnack
Summary: The study reveals that certain spin-phonon Hamiltonians exhibit unexpected robustness against the suppression of magnetization tunneling, even for strong spin-phonon coupling.
EUROPEAN PHYSICAL JOURNAL B
(2021)
Article
Materials Science, Multidisciplinary
Simon Michel, Michael Potthoff
Summary: The study discusses the emergence of an effective low-energy theory for the real-time dynamics of two classical impurity spins, derived for weak local exchange coupling between impurity and host spins. It incorporates both classical spin torques and a novel topological spin torque. By comparing it to the numerical solution, the effective theory's applicability under certain parameter regimes is identified.
Article
Engineering, Electrical & Electronic
Liwei Jiang, Lihong Duan, Jiali Liu, Yixiang Liang, Wei Quan, Jiancheng Fang
Summary: In this study, the relaxation of alkali metal atoms in comagnetometers was systematically investigated, revealing that spin-exchange relaxation is not completely eliminated under normal operating conditions. Despite the presence of optical pumping, spin-exchange relaxation still plays a dominant role in broadening electron Zeeman resonances due to a large electron magnetic field. This study demonstrates the operation of alkali metal atoms in comagnetometers near the SERF regime with a large electron magnetic field, providing insights for reducing relaxation and improving sensitivity.
IEEE TRANSACTIONS ON INSTRUMENTATION AND MEASUREMENT
(2021)
Article
Physics, Multidisciplinary
V. V. Belykh, A. R. Korotneva, D. R. Yakovlev
Summary: By simultaneously applying a radio frequency field and periodic optical pulses, this study successfully addresses the issue of inhomogeneity and fluctuating environment affecting the coherence time of an electron spin ensemble. The research resulted in a 50-Hz-narrow electron spin resonance with milliseconds-long T-2 in Ce3+ ions, paving the way for coherent optical manipulation in spin systems decoupled from their inhomogeneous environment.
PHYSICAL REVIEW LETTERS
(2021)
Article
Materials Science, Multidisciplinary
F. L. Pratt, F. Lang, W. Steinhardt, S. Haravifard, S. J. Blundell
Summary: Electron spin dynamics in the triangular-lattice quantum spin-liquid candidate YbZnGaO4 was investigated, revealing no evidence for freezing or ordering of the Yb spins. The muon spin relaxation rate can be decomposed into two contributions, one dependent on longitudinal magnetic field and the other independent of field. The spin-diffusion rate follows the expected form for two-dimensional diffusion of mobile spin excitations, and reduces significantly in the low temperature quantum regime, attributed to the effect of quantum entanglement. Comparison with theory suggests that the nodal spin-liquid model U1A11 provides better agreement with experimental data.
Article
Optics
Devvrat Tiwari, Shounak Datta, Samyadeb Bhattacharya, Subhashish Banerjee
Summary: In this article, we derive the dynamics of a two-qubit system interacting with spin baths composed of qubits in a thermal state. We analyze the non-Markovian nature of the two qubit dynamics and observe the evolution of quantum correlations under the influence of environmental interaction. We also compare the exact two-qubit dynamics with a locally acting central spin model in a spin bath. This work is important for realizing non-Markovian heat engines and other quantum thermal devices.
Article
Multidisciplinary Sciences
R. Nakajima, D. Hirobe, G. Kawaguchi, Y. Nabei, T. Sato, T. Narushima, H. Okamoto, H. M. Yamamoto
Summary: Chiral molecules exhibit spin-selective charge emission, which is called chirality-induced spin selectivity. Despite being made of light elements, their spin polarization can exceed that of typical ferromagnets. This has potential applications in the chiral spintronics field. Through magnetoresistance measurements, we observed the two suggested phenomena, effective enhancement of spin-orbit interactions and chirality represented by oppositely polarized spins, in an organic chiral superconductor. Our findings provide insights into the origin of spin selectivity in chiral molecules and contribute to the development of superconducting spintronics research.
Article
Multidisciplinary Sciences
Takuya Funatsu, Shun Kanai, Jun'ichi Ieda, Shunsuke Fukami, Hideo Ohno
Summary: By studying superparamagnetic tunnel junctions, the authors reveal the characteristics of the Neel-Arrhenius law and provide a rigorous mathematical foundation for the engineering design of probabilistic computing hardware.
NATURE COMMUNICATIONS
(2022)
