Article
Materials Science, Multidisciplinary
Marcos Marino, Tomas Reis
Summary: We analytically determine the energy gap at weak coupling in the attractive multicomponent Gaudin-Yang model using three different methods. The results obtained from these methods provide a nontrivial test of the ideas of resurgence and renormalons as applied to nonrelativistic many-body systems.
Article
Optics
Zoran Ristivojevic
Summary: In this study, we analyze the dispersion relation of a polaron quasiparticle in a one-dimensional Bose gas with two internal states described by the Yang-Gaudin model. We calculate the dispersion in the thermodynamic limit under both weak and strong interaction regimes, without limitations on the momentum. By deriving explicit expressions for the polaron dispersion, we find that it has the form of a power series with interaction-dependent coefficients. Moreover, we show that the coefficients of the series are connected to the Maclaurin series of the polaron dispersion, which allows for easy calculation of the dispersion at all momenta.
Article
Optics
Zheng Gao, Lianyi He, Huaisong Zhao, Shi-Guo Peng, Peng Zou
Summary: We calculate the density dynamic structure factor of one-dimensional Fermi superfluid with Raman-type spin-orbit coupling and analyze its main dynamical characteristics during the phase transition between Bardeen-Cooper-Schrieffer superfluid and topological superfluid. Our results show four types of single-particle excitations induced by the two-branch structure of the single-particle spectrum, and the cross single-particle excitation is more easily observed in the spin dynamic structure factor at a small transferred momentum. Additionally, we observe a new rotonlike collective mode at a fixed transferred momentum q similar to 2(k)F, which only appears in the topological superfluid state.
Article
Chemistry, Multidisciplinary
Olivier Mentre, Miguel A. Juarez-Rosete, Sebastien Saitzek, Cintli Aguilar-Maldonado, Marie Colmont, Angel M. Arevalo-Lopez
Summary: BiVO3F, a unique example of bismuth vanadyl oxyhalide with paramagnetic V4+ centers, features 1D magnetic units with rare alternation of edge-sharing O-O and F-F bridges in its crystal structure. Despite similarities with BiVO4, BiVO3F shows relatively modest photoactivity due to fast electron-hole recombination facilitated by electronic pairing.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2021)
Article
Biochemistry & Molecular Biology
Tomas Fiala, Rahel Heeb, Luca Vigliotti, Helma Wennemers
Summary: N-terminal acylation is commonly used to install functional moieties on collagen model peptides. The length of short acyl capping groups has different effects on the thermal stability of collagen triple helices in different frames. This study provides a basis for designing N-terminally functionalized CMPs with predictable effects on triple helix stability.
Article
Mathematics
Yicun Li, Yuanyang Teng
Summary: This paper constructs a seven-factor model using monthly data of the A-share market, adding the Hurst exponent factor and the momentum factor to a Fama-French five-factor model. The results show a 7% improvement in the average R-squared. Additionally, five machine learning algorithms are compared with ordinary least squares (OLS) in terms of fitting power, indicating that regularization algorithms have worse performance, while SVM and random forests show good improvement and the efficacy of neural networks varies depending on the data, frequency, and period.
Article
Multidisciplinary Sciences
Jagannath Jena, Borge Gobel, Tomoki Hirosawa, Sebastian A. Diaz, Daniel Wolf, Taichi Hinokihara, Vivek Kumar, Ingrid Mertig, Claudia Felser, Axel Lubk, Daniel Loss, Stuart S. P. Parkin
Summary: Recent experiments have observed the formation and stability of fractional antiskyrmions and fractional elliptical skyrmions at the edges of a Heusler material. These fractional spin textures coexist with nano-objects with integer topological charges within the sample. The ability of these objects to continuously vary their topological charges in the presence of magnetic fields makes them a unique state of matter and a promising platform for spintronic and magnonic applications in the Heusler family of compounds.
NATURE COMMUNICATIONS
(2022)
Article
Computer Science, Information Systems
Zhiqing Tang, Fuming Zhang, Xiaojie Zhou, Weijia Jia, Wei Zhao
Summary: This paper proposes a novel pricing model for dynamic resource overbooking in edge computing, which includes methods for different user needs, auction billing, and resource prediction. Experimental results show that this dynamic resource overbooking mechanism maximizes the profit of edge nodes and ensures high QoS satisfaction.
IEEE TRANSACTIONS ON CLOUD COMPUTING
(2023)
Article
Physics, Multidisciplinary
G. Seto, R. A. A. Yessoufou, A. Kpadonou, E. Albayrak
Summary: This study investigates the critical and hysteresis behaviors of a ferromagnetic mixed-spin system using Monte Carlo simulations. The phase diagrams and critical exponents of the model are obtained, revealing second-order phase transitions. The hysteresis behavior is also analyzed, showing that the width of the hysteresis loop decreases with temperature.
PHYSICA A-STATISTICAL MECHANICS AND ITS APPLICATIONS
(2022)
Article
Mathematics, Interdisciplinary Applications
Hasan Akin
Summary: We study an Ising model with mixed spins {+/- 1/2} and {+/- 2, +/- 1, 0} on a second-order Cayley tree. The Gibbs measures and disordered phases associated with the model are analyzed. A system of functional equations is obtained using the compatibility condition. In contrast to the Ising model with two different neighbor interactions, we find that the phase transition phenomenon occurs in both the antiferromagnetic and ferromagnetic regions for the given model. The stability of the associated dynamic system is analyzed at the fixed point, and numerical calculations show chaotic behavior in certain regions. Extremal disordered phases are identified using a tree-indexed Markov chain, and the Kesten-Stigum condition for non-extremality of the disordered phase is satisfied based on the fixed point.
CHAOS SOLITONS & FRACTALS
(2023)
Article
Energy & Fuels
Aboozar Soleymanzadeh, Parvin Kolah Kaj, Shahin Kord, Masood Monjezi
Summary: The saturation of fluids in a hydrocarbon reservoir, which is crucial in evaluating reservoir resources, can be accurately determined through the new technique of electric rock typing based on dynamic electrical efficiency, improving the precision of saturation estimation.
JOURNAL OF PETROLEUM SCIENCE AND ENGINEERING
(2021)
Article
Physics, Mathematical
Vasileios Ektor Papoulias
Summary: The study utilizes the Stenzel Calabi-Yau structure on T-star S-4 as a testing ground for the relationship between Spin(7) instanton and Hermitian-Yang-Mills (HYM) equations, reducing both problems to tractable ODEs and examining invariant solutions. Local equivalence and global nonexistence results are established in the abelian case, while the moduli space of invariant Spin(7) instantons with SO(3) structure group is constructed in the nonabelian case, showing the negative resolution of the equivalence question between the two gauge theoretic PDEs. The HYM connections play a crucial role in the compactification of the moduli space, with a phenomenon of removable singularity that is intended for further examination in future work.
COMMUNICATIONS IN MATHEMATICAL PHYSICS
(2021)
Article
Chemistry, Multidisciplinary
Zongcheng Gong, Qin Xiang, Ke Li, Zhuofan Xu, Jinlian Hu, Yong Ni, Sota Sato, Zhe Sun
Summary: This study presents a synthetic approach for synthesizing stable open-shell hydrocarbon systems and investigates the influence of edge structures on spin and charge distribution. The results demonstrate that with the elongation of conjugation, the spin and charge shift from pentagon defects to zigzag edges. Notably, one of the compounds exhibits exceptional stability in air-saturated solutions, offering potential applications in electronic materials.
CHINESE JOURNAL OF CHEMISTRY
(2022)
Article
Physics, Particles & Fields
Dimitrios Metaxas
Summary: This paper examines a set of Feynman rules and resulting effective action that were proposed to incorporate the constraint of Gauss's law in the perturbation expansion of gauge field theories. It investigates a set of solutions for the Lagrangian and Hamiltonian equations of motion in Minkowski space-time, as well as their stability. The paper also discusses the Euclidean action, confinement, and the strong-CP problem, and explores the properties and symmetries of the perturbative and confining vacuum, possible transitions between them, and their relations to phenomenological models of strong interactions.
EUROPEAN PHYSICAL JOURNAL C
(2022)
Article
Materials Science, Multidisciplinary
Yi-Ying Chin, Zhiwei Hu, Yuichi Shimakawa, Junye Yang, Youwen Long, A. Tanaka, Liu Hao Tjeng, Hong-Ji Lin, Chien-Te Chen
Summary: Using soft x-ray absorption spectroscopy, the charge and spin states of transition metal ions in YCu3Co4O12 and CaCu3Co4O12 were determined. The low-spin trivalent nature of Cu and Co ions in both materials make them nonmagnetic band semiconductors. The good electrical conductivity of CaCu3Co4O12 is attributed to the presence of low-spin Co ions, allowing for efficient charge exchange between Co3+ and Co4+.
Article
Physics, Multidisciplinary
A. -M Visuri, T. Giamarchi, C. Kollath
Summary: This paper studies particle transport through a chain of coupled sites connected to free-fermion reservoirs at both ends, with a local particle loss. The conductance and particle density in the steady state are calculated using the Keldysh formalism for open quantum systems. In addition to a reduction in conductance, it is found that transport can remain (almost) unaffected by the loss for certain values of the chemical potential in the lattice. It is shown that this protected transport is a result of the spatial symmetry of single-particle eigenstates. At a finite voltage, the density profile develops a drop at the lossy site, connected to the onset of nonballistic transport.
PHYSICAL REVIEW LETTERS
(2022)
Article
Optics
Shintaro Takayoshi, Thierry Giamarchi
Summary: We study the transport properties of a one-dimensional quantum system with disorder and compute the frequency dependence of its conductivity using numerical methods. The results show that the conductivity decays as a power law at high frequencies and follows a linear behavior at low frequencies, with both behaviors being affected by the interaction strength. The localization length also exhibits a power law dependence on the disorder strength, in agreement with theoretical predictions. These findings have implications for experiments with cold atomic gases.
EUROPEAN PHYSICAL JOURNAL D
(2022)
Article
Physics, Multidisciplinary
Paola Ruggiero, Pasquale Calabrese, Thierry Giamarchi, Laura Foini
Summary: This article studies the correlation functions after a quantum quench of a gaussian field problem, providing a fully analytical solution using the electrostatic analogy and charge images method. This analytical solution allows for obtaining all correlation functions in imaginary time, recovering and generalizing the results in real time.
Article
Physics, Multidisciplinary
Meng-Zi Huang, Jeffrey Mohan, Anne -Maria Visuri, Philipp Fabritius, Mohsen Talebi, Simon Wili, Shun Uchino, Thierry Giamarchi, Tilman Esslinger
Summary: We measure the superfluid transport of strongly interacting fermionic lithium atoms through a quantum point contact by utilizing local, spin-dependent particle loss. We find that the characteristic non-Ohmic superfluid transport, enabled by high-order multiple Andreev reflections, transitions into an excess Ohmic current when the dissipation strength exceeds the superfluid gap. Our developed model, which includes mean-field reservoirs connected to a dissipative site via tunneling, reproduces the observed nonequilibrium particle current in the Keldysh formalism, but it does not fully explain the observed loss rate or spin current.
PHYSICAL REVIEW LETTERS
(2023)
Article
Physics, Multidisciplinary
Hugo Cayla, Pietro Massignan, Thierry Giamarchi, Alain Aspect, Christoph I. Westbrook, David Clement
Summary: We measured the momentum density in a Bose-Einstein condensate (BEC) with dilute spin impurities and observed algebraic tails decaying as 1/k4 at large momentum k, which originated from impurity-BEC interactions. The amplitudes of these tails exceeded those expected from two-body contact interactions at equilibrium in the trap. These unexpected algebraic tails were found to originate from the nontrivial dynamics of the expansion in the presence of impurity-bath interactions.
PHYSICAL REVIEW LETTERS
(2023)
Article
Physics, Multidisciplinary
Gunnar Bollmark, Thomas Kohler, Lorenzo Pizzino, Yiqi Yang, Johannes S. Hofmann, Hao Shi, Shiwei Zhang, Thierry Giamarchi, Adrian Kantian
Summary: Correlated electron states are crucial for understanding unconventional superconductivity. However, calculating their properties accurately remains a challenge. In this work, we propose a framework combining matrix product states (MPS) with mean field (MF) to compute the properties of quasi-one-dimensional (Q1D) systems. We demonstrate the effectiveness of this framework by calculating the critical temperature for superconductivity in Q1D fermions. This approach allows for the quantitative study of correlated phases and the treatment of competing macroscopic orders.
Article
Multidisciplinary Sciences
T. -W. Zhou, G. Cappellini, D. Tusi, L. Franchi, J. Parravicini, C. Repellin, S. Greschner, M. Inguscio, T. Giamarchi, M. Filippone, J. Catani, L. Fallani
Summary: The Hall effect, which describes the motion of charged particles in magnetic fields, has important implications for material properties. Understanding this effect in interacting systems is challenging, even for small magnetic fields. In this study, we used an atomic quantum simulator to investigate the behavior of ultracold fermions in the presence of artificial magnetic fields. Through experimental measurements, we observed a universal behavior of the Hall response, which is independent of the strength of atomic interactions. This research demonstrates the capability of quantum simulation to describe strongly correlated topological states of matter.
Article
Materials Science, Multidisciplinary
Tony Jin, Paola Ruggiero, Thierry Giamarchi
Summary: We derive the bosonization of the interacting fermionic Su-Schrieffer-Heeger (SSH) model with open boundaries and use it to quantitatively describe the edge modes of the system. Our results show excellent agreement with numerical simulations, particularly in terms of the localization of the zero-energy edge mode near the boundaries. Interestingly, we find that the effects of repulsive or attractive interactions on the edge mode localization depend on the staggering parameter. We provide quantitative predictions of these effects on the localization length of the edge mode and suggest that bosonization can be generalized to other models.
Article
Materials Science, Multidisciplinary
Saptarshi Majumdar, Laura Foini, Thierry Giamarchi, Alberto Rosso
Summary: We study an XXZ spin chain coupled to an ohmic bath of harmonic oscillators at zero temperature. Two phases, separated by a Kosterlitz-Thouless transition, are found: a Luttinger liquid phase with finite spin stiffness at low coupling and a dissipative phase with vanishing spin stiffness at high coupling. The transport properties are also affected, with the Luttinger liquid phase being a perfect conductor and the dissipative phase showing finite resistivity. The effect of the bath can be interpreted as annealed disorder-inducing signatures of localization.
Article
Physics, Multidisciplinary
A. -M. Visuri, T. Giamarchi, C. Kollath
Summary: This paper investigates particle transport, particle loss, and nonequilibrium steady states in a dissipative one-dimensional lattice connected to reservoirs at both ends. By applying local particle loss to the center site, particle transport is generated between free-fermion reservoirs with different chemical potentials. The conserved current and loss current as functions of voltage in the nonlinear regime are computed using a Keldysh description. The behaviors of the currents are affected differently by the local loss, resulting in either smoothed, nearly unaffected, or even enhanced steps depending on the spatial symmetry of the single-particle eigenstate.
PHYSICAL REVIEW RESEARCH
(2023)
Article
Physics, Multidisciplinary
Tony Jin, Joao Ferreira, Michel Bauer, Michele Filippone, Thierry Giamarchi
Summary: We have developed a semiclassical model to study the transport properties of low-dimensional fermionic lattices under the influence of external quantum stochastic noise. These systems exhibit behavior similar to quantum stochastic resistors, where bulk particle transport is diffusive and follows Ohm's/Fick's law. By extending previous studies beyond one-dimensional systems to ladder geometries, we have explored different dephasing mechanisms relevant to various physical systems. Our results show that the semiclassical description provides a useful and simpler interpretation of the conductance dependence on chemical potential, which agrees well with exact numerical solutions. Additionally, we have found that the coherence of the dephasing process in the transverse direction does not affect the conductance of quantum ladders, despite different stationary states being reached.
PHYSICAL REVIEW RESEARCH
(2023)
Article
Physics, Multidisciplinary
Catalin-Mihai Halati, Thierry Giamarchi
Summary: We investigate the properties of interacting bosonic particles on a two-leg triangular ladder with an artificial gauge field. By using numerical simulations and analytical bosonization calculations, we explore the complex phase diagram of this system. The interplay between the frustration from the triangular lattice geometry and the interactions leads to the emergence of multiple chiral quantum phases. Phase transitions from superfluid to Mott-insulating states occur, exhibiting Meissner or vortex characteristics. Moreover, we discover a biased chiral superfluid state that breaks the symmetry between the two legs of the ladder, particularly for flux values close to pi. In the regime of hard-core bosons, we demonstrate the extension of the bond order insulator, beyond the fully frustrated ladder case, with Meissner-type chiral currents. We discuss the implications of our findings for experimental studies in cold atomic systems.
PHYSICAL REVIEW RESEARCH
(2023)
Article
Materials Science, Multidisciplinary
Izabella Lovas, Robert Citro, Eugene Demler, Thierry Giamarchi, Michael Knap, Edmond Orignac
Summary: We study a quantum many-body variant of the parametric oscillator using a semiclassical truncated Wigner approximation (TWA) to investigate the driven sine-Gordon model with a modulated tunnel coupling. By comparing different methods, we find that TWA can be used to explore the mode-resolved energy density dynamics and higher-order correlations between modes in the prethermal heating regime.
Article
Physics, Fluids & Plasmas
Nirvana Caballero, Thierry Giamarchi, Vivien Lecomte, Elisabeth Agoritsas
Summary: In this study, we numerically compute the roughness of a one-dimensional elastic interface and find a power-law behavior at short lengthscales. Contrary to available analytic predictions, we find that the associated exponent is less than 1. We discuss the implications of these findings for the temperature dependence of roughness and the connection with the asymptotic random-manifold regime at large lengthscales.
Article
Physics, Multidisciplinary
Tony Jin, Joao S. Ferreira, Michele Filippone, Thierry Giamarchi
Summary: We study the transport properties of generic out-of-equilibrium quantum systems connected to fermionic reservoirs. We develop a perturbation scheme in the inverse system size, named 1/N expansion, to study a large class of out of equilibrium diffusive/ohmic systems. The exact solution for quantum stochastic Hamiltonians (QSHs) models confirms the validity of our system size expansion ansatz, and its efficiency in capturing the transport properties. We consider three fermionic models: a model with local dephasing, the quantum simple symmetric exclusion process model, and a model with long-range stochastic hopping.
PHYSICAL REVIEW RESEARCH
(2022)