Article
Physics, Multidisciplinary
A. Kalvova, V. Spicka, B. Velicky, P. Lipavsky
Summary: This article introduces the generalized Kadanoff-Baym Ansatz, which is used to simplify non-equilibrium Green's functions into the kinetic equation for the density matrix. The article proposes an approximation of the vertex correction that dynamically changes based on the density matrix while benefiting from the simplicity of stationary propagators. By conducting experiments on the molecular bridge between ferromagnetic leads, we demonstrate that this simple vertex correction can fix the failure of the kinetic equation at negligible computational cost.
Article
Astronomy & Astrophysics
Xin-Li Sheng, Nora Weickgenannt, Enrico Speranza, Dirk H. Rischke, Qun Wang
Summary: In this study, Boltzmann equations for massive spin-1/2 fermions were derived from the Kadanoff-Baym equation in the Schwinger-Keldysh formalism, accounting for spin degrees of freedom. The equations are expressed in terms of matrix-valued spin distribution functions, allowing for simulating spin-transport processes involving spin-vorticity couplings from first principles.
Article
Chemistry, Physical
Riku Tuovinen, Robert van Leeuwen, Enrico Perfetto, Gianluca Stefanucci
Summary: The generalized Kadanoff-Baym ansatz (GKBA) provides a cost-effective way to simulate out-of-equilibrium quantum systems. Recent advancements have overcome the limitation of neglecting initial correlations in the conventional GKBA approach. In the context of quantum transport, a further extension of the GKBA approach is needed to account for the contacted nature of the initial state.
JOURNAL OF CHEMICAL PHYSICS
(2021)
Article
Physics, Multidisciplinary
Andrei T. Patrascu
Summary: An experiment is proposed to demonstrate that the graviton is a quantum entity by showing that quantum entanglement can be produced through the exchange of gravitons. This requires observing the entanglement between two objects in the experiment and eliminating other sources of entanglement such as virtual photon exchange. The analysis utilizes methods from the Schwinger-Keldysh and Kadanoff-Baym formalisms, along with quantum Boltzmann-type equations, to study graviton-mediated polarization-polarization photon entanglement. Applications in cosmology are also discussed.
EUROPEAN PHYSICAL JOURNAL PLUS
(2023)
Article
Optics
Tang-You Huang, Michele Modugno, Xi Chen
Summary: The study presents an effective scaling approach for frictionless quantum quenches in a one-dimensional Bose gas trapped in a harmonic trap, allowing for the inverse engineering of the smooth trap frequency. This method is beneficial for designing shortcut-to-adiabaticity expansions of trapped Bose gases with arbitrary interaction values, and can be extended to the three-dimensional case directly.
Article
Engineering, Multidisciplinary
Alexander Warsewa, Michael Boehm, Oliver Sawodny, Cristina Tarin
Summary: This paper presents a comprehensive framework for modeling complex mechanical structures as port-Hamiltonian systems, suitable for adaptive structures with high complexity and heterogeneity. The approach allows for subsystem dynamics to be interconnected by means of power flows and is applicable for robust decentralized control schemes.
APPLIED MATHEMATICAL MODELLING
(2021)
Article
Astronomy & Astrophysics
Reka A. Vig, Tamas G. Kovacs
Summary: At the finite temperature phase transition, the nature of topological fluctuations in SU(3) gauge theory changes dramatically, forming a noninteracting ideal gas. A novel method was used in the study to accurately count the number of positively and negatively charged topological objects, revealing a distribution consistent with that of an ideal gas.
Article
Chemistry, Physical
Maria-Andreea Filip, Alex J. W. Thom
Summary: The development of multireference coupled cluster (MRCC) techniques in electronic structure theory has been challenging due to the complexity in expressing a multiconfigurational wavefunction within the single-reference coupled cluster framework. The multireference-coupled cluster Monte Carlo (mrCCMC) technique, based on the Monte Carlo approach, offers a simpler alternative but needs improvement in accuracy and computational cost. This paper explores incorporating ideas from conventional MRCC to the mrCCMC framework, resulting in methods with increased relaxation of the reference space and a better understanding of solutions to the mrCCMC equations.
JOURNAL OF CHEMICAL PHYSICS
(2023)
Review
Development Studies
Eran Feitelson, Eliahu Stern
Summary: Thirty years after Bruntland, there is still no consensus on the definition of sustainability due to the diverse meanings, tradeoffs, and political aspects involved. In recent decades, the focus has shifted to defining what is unsustainable in order to identify safe and just spaces. This approach is scalable and adaptable, allowing for the introduction of additional dimensions based on scale, sector, and setting.
SUSTAINABLE DEVELOPMENT
(2023)
Article
Physics, Multidisciplinary
Yves H. Kwan, Yichen Hu, Steven H. Simon, S. A. Parameswaran
Summary: The study reveals the topological features of neutral particle-hole pair excitations and their impact on the bound states in correlated QAH insulators. This results in the formation of topological exciton bands with robust features. The research also applies these ideas to broken-symmetry spontaneous QAH insulators in magic-angle twisted bilayer graphene with substrate alignment.
PHYSICAL REVIEW LETTERS
(2021)
Article
Engineering, Electrical & Electronic
Mehdi Jalali, Kazem Zare, Sajjad Tohidi
Summary: This paper introduces a new trading mechanism for future transactive distribution systems with multiple private microgrids, where an independent economic entity as a third-party agent facilitates secure information sharing and fair market through double auction market clearing; real-time operation is distributed between players based on ADMM to ensure technical constraints and determine optimal scheduling.
INTERNATIONAL JOURNAL OF ELECTRICAL POWER & ENERGY SYSTEMS
(2022)
Article
Engineering, Multidisciplinary
F. Yu, S. Chen, G. D. Lawrence, N. A. Warrior, L. T. Harper
Summary: This study investigates the forming behavior of preforms made from Non-Crimp Fabric (NCF) for manufacturing complex double-curved geometries using Double Diaphragm Forming (DDF). Finite element (FE) simulations are used to study the effect of ply layup sequence on the formation of fabric wrinkles. The simulation results are in good agreement with experimental results, showing the location and number of fabric wrinkles for single or multi-ply layups. The simulations reveal that fabric over-shearing induced by convex double-curved features and dissimilar inter-ply shear deformations lead to fabric wrinkles.
COMPOSITES PART B-ENGINEERING
(2023)
Article
Chemistry, Physical
Bei-Lei Liu, Yue-Chao Wang, Yu Liu, Hai-Feng Liu, Hai-Feng Song
Summary: We have developed a doubly screened Coulomb correction (DSCC) method for efficiently correcting the on-site Coulomb interaction in strongly correlated materials, and it can accurately simulate electronic and magnetic properties. Compared to hybrid functionals, DSCC has comparable accuracy but is an order of magnitude faster, and it can reflect the difference in the Coulomb interaction between metallic and insulating situations.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2023)
Article
Physics, Multidisciplinary
Shaobo Liu, Jie Yuan, Sheng Ma, Zouyouwei Lu, Yuhang Zhang, Mingwei Ma, Hua Zhang, Kui Jin, Li Yu, Fang Zhou, Xiaoli Dong, Zhongxian Zhao
Summary: The study reveals the presence of magnetically polarized spin nematicity induced by a magnetic field in the FeSe1-x S x and FeSe1-y Te y systems, showing a different response to sulfur substitution compared to the spontaneous electronic nematicity. This induced spin nematicity significantly suppresses superconductivity in both FeSe1-x S x and FeSe1-y Te y samples.
CHINESE PHYSICS LETTERS
(2021)
Article
Physics, Multidisciplinary
Seung-Gyo Jeong, Sang-Hoon Han, Tae-Hwan Kim, Sangmo Cheon
Summary: In this study, the authors investigate hidden chiral domain wall states and their topological properties in a double-chain Su-Schrieffer-Heeger model and elucidate a series of single and double gap phases that occur by varying the dimerization and interchain coupling.
COMMUNICATIONS PHYSICS
(2023)
Article
Physics, Condensed Matter
Soeren E. B. Nielsen, Michael Ruggenthaler, Robert van Leeuwen
EUROPEAN PHYSICAL JOURNAL B
(2018)
Article
Physics, Condensed Matter
Klaas J. H. Giesbertz, Anna-Maija Uimonen, Robert van Leeuwen
EUROPEAN PHYSICAL JOURNAL B
(2018)
Article
Physics, Multidisciplinary
M. J. Hyrkas, D. Karlsson, R. van Leeuwen
JOURNAL OF PHYSICS A-MATHEMATICAL AND THEORETICAL
(2019)
Article
Physics, Condensed Matter
Markku Hyrkas, Daniel Karlsson, Robert van Leeuwen
PHYSICA STATUS SOLIDI B-BASIC SOLID STATE PHYSICS
(2019)
Article
Physics, Multidisciplinary
Riku Tuovinen, Enrico Perfetto, Robert van Leeuwen, Gianluca Stefanucci, Michael A. Sentef
NEW JOURNAL OF PHYSICS
(2019)
Article
Physics, Multidisciplinary
Daniel Karlsson, Robert van Leeuwen, Yaroslav Pavlyukh, Enrico Perfetto, Gianluca Stefanucci
Summary: This paper presents a computationally efficient Green's function scheme, enabling real-time simulations of electron-boson interactions with linear scaling of numerical effort with propagation time. The real-time study highlights the nonthermal behavior of phononic degrees of freedom in phonon-driven relaxation dynamics.
PHYSICAL REVIEW LETTERS
(2021)
Article
Chemistry, Physical
Markus Penz, Robert van Leeuwen
Summary: The study on the principles of density-functional theory applied to finite lattice systems represented by graphs has revealed surprising characteristics and insights into the topological structure of the density-potential mapping. By providing precise conditions for the uniqueness of v-representability of a ground state and demonstrating that this property holds for almost all densities, the non-convexity of the pure-state constrained-search functional is illustrated through a set of examples.
JOURNAL OF CHEMICAL PHYSICS
(2021)
Article
Physics, Multidisciplinary
M. J. Hyrkas, D. Karlsson, R. van Leeuwen
Summary: This paper presents an improved diagrammatic approximation method to preserve the positivity of observables at finite temperature. By using cutting rules, it solves the problem of negative spectral densities and non-vanishing vacuum diagrams, and also derives an analytic continuation relation between retarded N-point functions and their Matsubara counterparts.
JOURNAL OF PHYSICS A-MATHEMATICAL AND THEORETICAL
(2022)
Article
Materials Science, Multidisciplinary
Y. Pavlyukh, E. Perfetto, Daniel Karlsson, Robert van Leeuwen, G. Stefanucci
Summary: This study presents a versatile toolbox for simulating the dynamics of interacting electron-boson systems out of equilibrium. It relies on the formalism of nonequilibrium Green's functions and the time-linear formulation of the Kadanoff-Baym equations. The toolbox includes various methods for treating electron-boson interactions and the Coulomb interaction, with linear scaling in time and satisfaction of fundamental conservation laws in all cases.
Article
Materials Science, Multidisciplinary
Y. Pavlyukh, E. Perfetto, Daniel Karlsson, Robert van Leeuwen, G. Stefanucci
Summary: The nonequilibrium dynamics of the open chain Holstein-Hubbard model is investigated using the linear time-scaling GKBA-PODE scheme. The study focuses on the parameters relevant to photovoltaic materials and accurately treats the electronic-electronic and electron-phonon correlations. The inclusion of the feedback of electrons on phonons is shown to be crucial for the conservation of total energy.
Article
Materials Science, Multidisciplinary
Y. Pavlyukh, G. Stefanucci, R. van Leeuwen
Article
Materials Science, Multidisciplinary
Ville J. Haerkoenen, Robert van Leeuwen, E. K. U. Gross
Article
Optics
Luis Cort, Soeren Ersbak Bang Nielsen, Robert van Leeuwen
Article
Materials Science, Multidisciplinary
Daniel Karlsson, Robert van Leeuwen, Enrico Perfetto, Gianluca Stefanucci
Article
Optics
Luis Cort, Daniel Karlsson, Giovanna Lani, Robert van Leeuwen
