Article
Mathematics, Interdisciplinary Applications
Yigit Ertac Pektas, E. Can Artun, A. Nihat Berker
Summary: The characteristics of a spin-glass system with a smooth or fractal outer surface were studied using renormalization-group theory. The study found that the spin-glass ordering on the smooth surface is different in the presence or absence of bulk spin-glass ordering, while the fractal surface always exhibits spin-glass ordering.
CHAOS SOLITONS & FRACTALS
(2023)
Article
Physics, Multidisciplinary
Marco Baity-Jesi, Enrico Calore, Andres Cruz, Luis Antonio Fernandez, Jose Miguel Gil-Narvion, Isidoro Gonzalez-Adalid Pemartin, Antonio Gordillo-Guerrero, David Iniguez, Andrea Maiorano, Enzo Marinari, Victor Martin-Mayor, Javier Moreno-Gordo, Antonio Munoz-Sudupe, Denis Navarro, Ilaria Paga, Giorgio Parisi, Sergio Perez-Gaviro, Federico Ricci-Tersenghi, Juan Jesus Ruiz-Lorenzo, Sebastiano Fabio Schifano, Beatriz Seoane, Alfonso Tarancon, Raffaele Tripiccione, David Yllanes
Summary: This study reveals the presence of dynamic temperature chaos in non-equilibrium dynamics, closely resembling equilibrium temperature chaos. The dynamic temperature chaos effect is shown to be controlled by the spin-glass coherence length xi.
COMMUNICATIONS PHYSICS
(2021)
Article
Physics, Multidisciplinary
M. Baity-Jesi, E. Calore, A. Cruz, L. A. Fernandez, J. M. Gil-Narvion, I. Gonzalez-Adalid Pemartin, A. Gordillo-Guerrero, D. Iniguez, A. Maiorano, E. Marinari, V. Martin-Mayor, J. Moreno-Gordo, A. Munoz Sudupe, D. Navarro, I. Paga, G. Parisi, S. Perez-Gaviro, F. Ricci-Tersenghi, J. J. Ruiz-Lorenzo, S. F. Schifano, B. Seoane, A. Tarancon, D. Yllanes
Summary: Memory and rejuvenation effects in off-equilibrium spin glasses have been regarded as a gateway to experimental exploration of ultrametricity and temperature chaos. However, simulating these effects has been difficult until recent advancements in computing power and understanding of length scales in aging dynamics of spin glasses. A numerical study has shown that at least three different length scales play a crucial role in aging dynamics, challenging previous theories that focused on a single glassy correlation length.
Article
Physics, Multidisciplinary
Junyu Lin, Junyu He, Mucan Jin, Guanghua Chen, Dajun Wang
Summary: This study characterizes the coherence between nuclear spin levels of ultracold ground-state sodium-rubidium molecules in a 3D optical lattice, achieving a maximum nuclear spin coherence time and ultrahigh spectroscopic resolution by compensating for main sources of decoherence.
PHYSICAL REVIEW LETTERS
(2022)
Article
Chemistry, Multidisciplinary
Li Sun, Nour El Islam Belmouri, Mamadou Ndiaye, Koen Robeyns, Aurelian Rotaru, Kamel Boukheddaden, Yann Garcia
Summary: In this study, two types of 3D porous coordination polymers were synthesized and characterized. These polymers exhibited different magnetic and optical properties during the cooling process. In addition, the cavities in these porous polymers could accommodate chloroform or dichloromethane molecules, further altering the material's properties. These materials have the potential to be used as reusable storage for chemical and gas sensors.
CRYSTAL GROWTH & DESIGN
(2023)
Article
Multidisciplinary Sciences
B. Divinskiy, H. Merbouche, V. E. Demidov, K. O. Nikolaev, L. Soumah, D. Gouere, R. Lebrun, V Cros, Jamal Ben Youssef, P. Bortolotti, A. Anane, S. O. Demokritov
Summary: Magnons, quantised magnetic excitations, can be driven into a Bose-Einstein condensation (BEC) state even at room temperature. The research demonstrates the possibility of achieving stationary equilibrium room-temperature magnon BEC via a spin-current, paving the way for integrated microscopic quantum magnonic and spintronic devices.
NATURE COMMUNICATIONS
(2021)
Article
Physics, Applied
Xuezhao Wu, Zihan Tong, Qiming Shao
Summary: Neurons in the brain exhibit nonlinear oscillatorlike behaviors, inspiring the development of neuromorphic computing with spin-torque oscillators for their low power consumption and high integration density. The time-multiplexing technique enables using only one device for neuromorphic computing, reducing power consumption and simplifying device fabrication. However, optimizing such systems remains a challenge and requires further development.
PHYSICAL REVIEW APPLIED
(2023)
Article
Physics, Multidisciplinary
B. Kaviya, R. Gopal, R. Suresh, V. K. Chandrasekar
Summary: We study the dynamics of a damped and driven Mathews-Lakshmanan oscillator type model with position-dependent mass term and find two distinct bifurcation routes leading to sudden, intermittent large-amplitude chaotic oscillations. These infrequent and recurrent large oscillations are characterized as extreme events (EE) when they exceed a pre-defined threshold height. Our findings reveal the emergence of EE from two different bifurcation routes, which has not been reported before. We discuss that EE are caused by the sudden expansion of the chaotic attractor through interior crisis in the system. The different dynamical states are distinguished using Lyapunov exponent spectrum, and the SNA and QP dynamics are determined using singular spectrum analysis and 0-1 test. The region of EE is characterized using the threshold height.
EUROPEAN PHYSICAL JOURNAL PLUS
(2023)
Article
Materials Science, Multidisciplinary
Roumita Roy, Sudipta Kanungo
Summary: In this study, the electronic structures of double perovskite compounds were investigated through density functional theory calculations. The results showed the significant impact of spin-orbit coupling on the ground state properties of these compounds, with different strengths and effects observed despite their similar electron count and valence states.
Article
Physics, Fluids & Plasmas
L. A. Fernandez, I. Gonzalez-Adalid Pemartin, V. Martin-Mayor, G. Parisi, F. Ricci-Tersenghi, T. Rizzo, J. J. Ruiz-Lorenzo, M. Veca
Summary: A growing body of evidence confirms the tenets of Bray and Roberts's theory by studying the Ising spin glass and its correlation length.
Article
Mathematics
Zhidong Zhang
Summary: The common feature for a nontrivial hard problem is the existence of nontrivial topological structures, non-planarity graphs, nonlocalities, or long-range spin entanglements in a model system with randomness. In this work, the relation between a spin-glass three-dimensional (3D) Ising model MSGI3D with the lattice size N = mnl and the K-SAT problems is investigated in detail. It is found that the spin-glass 3D Ising model can be mapped to a K-SAT problem by proving the equivalence between the absolute minimum core (AMC) model and the K-SAT problem for K = 3.
Article
Physics, Fluids & Plasmas
Depei Zhang, Tianran Chen, Marija Vucelja, Seung-Hun Lee, Gia-Wei Chern
Summary: This study introduces an efficient dynamical tree method to demonstrate the thermoremanent magnetization memory effect and condensation effect in a hierarchical energy landscape, showing the structural phase transition of the multilayer tree model coinciding with the onset of the condensation phenomenon. The results highlight the importance of hierarchical structure and the close relationship between glassy behavior and structure of barrier trees.
Article
Chemistry, Physical
Lijin Wang, Licun Fu, Yunhuan Nie
Summary: Research reveals that the relationship between the density of states and frequency of low-frequency excess vibrational modes in some three-dimensional glasses does not follow the quartic law found in previous simulation studies, which has implications for understanding the properties of glasses.
JOURNAL OF CHEMICAL PHYSICS
(2022)
Article
Multidisciplinary Sciences
Fehmi Sami Yasin, Jan Masell, Kosuke Karube, Daisuke Shindo, Yasujiro Taguchi, Yoshinori Tokura, Xiuzhen Yu
Summary: Recent studies have demonstrated the control of magnetic skyrmions and antiskyrmions through thermal current, leading to the transformation between different magnetic states and the switching of helical states. This discovery has significant implications for spintronics research and development.
NATURE COMMUNICATIONS
(2023)
Article
Physics, Multidisciplinary
Xiao-Chen Na, Nan Si, Feng-Ge Zhang, Wei Jiang
Summary: Using an effective field theory with correlations, the magnetic properties of an octahedral chain described by a mixed spin Ising model were investigated. Unique phenomena were observed, such as multiple hysteresis loops, saturation magnetization, and reverse flip of the magnetization plateaus. These findings are important for further understanding the magnetic properties of one-dimensional systems and could have potential applications in spin device design.
Article
Physics, Multidisciplinary
Maria Chiara Angelini, Carlo Lucibello, Giorgio Parisi, Gianmarco Perrupato, Federico Ricci-Tersenghi, Tommaso Rizzo
Summary: This study analyzes the spin-glass transition in finite dimension at zero temperature, revealing crucial differences with classical results such as the upper critical dimension D-U >= 8 for mean-field theory failure.
PHYSICAL REVIEW LETTERS
(2022)
Article
Physics, Multidisciplinary
Silvio Franz, Flavio Nicoletti, Giorgio Parisi, Federico Ricci-Tersenghi
Summary: In this study, we investigate the energy minima of a fully-connected m-components vector spin glass model in an external magnetic field, and study the transition from paramagnetic phase to spin glass phase. The spectral properties of the model are examined and it is found that the spectrum is gapless with pseudo-gap. Despite the long-range nature of the model, the eigenstates close to the edge of the spectrum display quasi-localization properties.
Article
Mechanics
Aurelien Decelle, Cyril Furtlehner, Beatriz Seoane
Summary: The mixing time is crucial in training restricted Boltzmann machines (RBMs) and determines the dynamics and stability of the trained model. RBMs operate in two different regimes, equilibrium and out-of-equilibrium, depending on the interplay between the mixing time and the number of steps used to approximate the gradient.
JOURNAL OF STATISTICAL MECHANICS-THEORY AND EXPERIMENT
(2022)
Article
Biochemical Research Methods
Beatriz Seoane, Alessandra Carbone
Summary: This study provides statistical evidence for the involvement of highly mobile and disordered regions in protein complex assembly. The results show that there is a general mechanism involving soft disorder in protein assembly, and the location of soft disordered residues changes with the increasing number of partners. The study also investigates the relationship between the confidence metric of AlphaFold2 and soft disorder.
PLOS COMPUTATIONAL BIOLOGY
(2022)
Article
Physics, Multidisciplinary
Adriano Barra, Giovanni Catania, Aurelien Decelle, Beatriz Seoane
Summary: In this paper, the equilibrium properties of bidirectional associative memories (BAMs) are investigated. The computational capabilities of a stochastic extension of BAM are characterized using statistical physics techniques. The phase diagram of the model at the replica symmetric level is provided, and the transition curves are analyzed as control parameters are tuned. The retrieval mechanism in BAM is explained by analogy with two interacting Hopfield models, and the potential equivalence with two coupled Restricted Boltzmann Machines is discussed.
JOURNAL OF PHYSICS A-MATHEMATICAL AND THEORETICAL
(2023)
Article
Physics, Multidisciplinary
M. Baity-Jesi, E. Calore, A. Cruz, L. A. Fernandez, J. M. Gil-Narvion, I. Gonzalez-Adalid Pemartin, A. Gordillo-Guerrero, D. Iniguez, A. Maiorano, E. Marinari, V. Martin-Mayor, J. Moreno-Gordo, A. Munoz Sudupe, D. Navarro, I. Paga, G. Parisi, S. Perez-Gaviro, F. Ricci-Tersenghi, J. J. Ruiz-Lorenzo, S. F. Schifano, B. Seoane, A. Tarancon, D. Yllanes
Summary: Memory and rejuvenation effects in off-equilibrium spin glasses have been regarded as a gateway to experimental exploration of ultrametricity and temperature chaos. However, simulating these effects has been difficult until recent advancements in computing power and understanding of length scales in aging dynamics of spin glasses. A numerical study has shown that at least three different length scales play a crucial role in aging dynamics, challenging previous theories that focused on a single glassy correlation length.
Article
Physics, Multidisciplinary
Jacopo Niedda, Giacomo Gradenigo, Luca Leuzzi, Giorgio Parisi
Summary: By using enhanced Monte Carlo numerical simulations parallelized on GPUs, we investigate the critical properties of the spin-glass-like model for the mode-locked glassy random laser. With two different boundary conditions for the mode frequencies, we determine the critical points and critical indices of the random lasing phase transition using finite size scaling techniques. The scaling analysis reveals that the mode-locked random laser universality class is compatible with a mean-field one, but differs from the mean-field class of the Random Energy Model and the glassy random laser in the narrow band approximation.
Article
Physics, Multidisciplinary
Nicolas Bereux, Aurelien Decelle, Cyril Furtlehner, Beatriz Seoane
Summary: Restricted Boltzmann Machines are powerful but often unstable in training. This work shows that the divergent Monte Carlo mixing times are related to phase coexistence, and proposes the Tethered Monte Carlo (TMC) method which can accelerate sampling and improve training. However, the limitations include the restriction to low-dimensional datasets and the inability to perform parallel updates.
Article
Multidisciplinary Sciences
Luca Bindi, Giorgio Parisi
Summary: In this article, the history of quasicrystals is briefly reviewed, and the Topical collection on Quasicrystals: State of the art and outlooks is introduced. This collection includes a number of review articles published in a conference held at the Accademia dei Lincei in November 2022.
RENDICONTI LINCEI-SCIENZE FISICHE E NATURALI
(2023)
Article
Materials Science, Multidisciplinary
Gianmarco Perrupato, Maria Chiara Angelini, Giorgio Parisi, Federico Ricci-Tersenghi, Tommaso Rizzo
Summary: In this study, we investigate the replica symmetry broken phase of spin glass models in a random field and derive a closed equation for the extreme values of the cavity fields. We find that the spontaneous RSB does not occur uniformly in the whole system and is independent of the parameters defining the RSB.
Article
Physics, Fluids & Plasmas
Claudia Artiaco, Rafael Diaz Hernandez Rojas, Giorgio Parisi, Federico Ricci-Tersenghi
Summary: This study presents the CALiPPSO algorithm for investigating the jamming transition of hard spheres. By treating the jamming problem as a constrained optimization problem, the algorithm is able to produce jammed hard sphere packings without using effective potentials. The algorithm is found to generate jammed packings that are always isostatic and in mechanical equilibrium. Extensive numerical simulations demonstrate that the algorithm can successfully probe the complex structure of the free-energy landscape and shows qualitative agreement with mean-field predictions. An open-source implementation of the algorithm is also provided.
Article
Astronomy & Astrophysics
Ludovico T. Giorgini, Ulrich D. Jentschura, Enrico M. Malatesta, Giorgio Parisi, Tommaso Rizzo, Jean Zinn-Justin
Summary: In this study, we verify the obtained analytic results for the O(N)-anharmonic oscillator by numerical calculations of higher-order coefficients. We demonstrate a significant improvement in the agreement between large-order asymptotic estimates and perturbation theory when incorporating two-loop corrections to the large-order behavior.
Article
Physics, Fluids & Plasmas
L. A. Fernandez, I. Gonzalez-Adalid Pemartin, V. Martin-Mayor, G. Parisi, F. Ricci-Tersenghi, T. Rizzo, J. J. Ruiz-Lorenzo, M. Veca
Summary: A growing body of evidence confirms the tenets of Bray and Roberts's theory by studying the Ising spin glass and its correlation length.
