Article
Physics, Multidisciplinary
Stephen Whitelam
Summary: We utilize Monte Carlo and genetic algorithms to train neural-network feedback-control protocols in order to convert measurement information into stored work or heat in fluctuating nanosystems. These protocols are capable of extracting work from a colloidal particle pulled by an optical trap and absorbing entropy by an Ising model undergoing magnetization reversal. The learning framework does not require prior knowledge of the system, only relies on experimentally accessible measurements, and can be scaled to complex systems.
Article
Physics, Multidisciplinary
Miquel Royo, Massimiliano Stengel
Summary: This study develops a fundamental theory on long-range electrostatic interactions in two-dimensional crystals by analyzing nonanalyticities of the Coulomb kernel. The research proposes a new method that significantly improves the description of these interactions, leading to enhanced quality of interpolated phonon band structures. By including explicit dynamical quadrupoles, the resulting formula is exact up to an arbitrary multipolar order.
Article
Physics, Multidisciplinary
Mario Krenn, Jakob S. Kottmann, Nora Tischler, Alan Aspuru-Guzik
Summary: Artificial intelligence (AI) has the potential to disrupt physics and science by helping scientists acquire new scientific understanding. The THESEUS algorithm demonstrates how AI can contribute at a conceptual level in physics, specifically in experimental quantum optics, by providing solutions that human scientists can interpret and derive new scientific concepts from.
Article
Physics, Multidisciplinary
Alexander Wietek, Yuan-Yao He, Steven R. White, Antoine Georges, E. Miles Stoudenmire
Summary: The interplay between thermal and quantum fluctuations controls the competition between phases of matter in strongly correlated electron systems. By studying the finite-temperature properties of the strongly coupled two-dimensional doped Hubbard model, it was discovered that the transition from the antiferromagnetic phase to the stripe phase occurs at temperature T=t approximate to 0.05 and is accompanied by a steplike feature of the specific heat. Some features resemble the pseudogap phase of high-temperature cuprate superconductors.
Article
Computer Science, Interdisciplinary Applications
Dou Du, Taylor J. Baird, Sara Bonella, Giovanni Pizzi
Summary: This paper introduces the OSSCAR platform, which provides an open collaborative environment for students and researchers to develop and access educational resources. By combining standard software tools with custom domain-specific ones, OSSCAR aims to minimize the efforts in creating and using new educational material. Examples from courses in physics, chemistry, and materials science are shown to demonstrate the interactivity and style of OSSCAR. The tools presented are easy to use and create a uniform and open environment exploitable by a large community.
COMPUTER PHYSICS COMMUNICATIONS
(2023)
Article
Mechanics
Adnan Mohammadi, Mohammad Hassan Djavareshkian
Summary: This paper presents an improved numerical scheme, Modified-AUSM+M, which enhances reliability and accuracy in simulating low-speed flows. The scheme achieves better accuracy and convergence speed through the improvement of the pressure diffusion term and velocity diffusion term.
Article
Astronomy & Astrophysics
Ying Wang, Wei Sun, Fuyao Liu, Xin Wu
Summary: Symplectic integrators that preserve the geometric structure of Hamiltonian flows and do not exhibit secular growth in energy errors are suitable for long-term integration in N-body Hamiltonian systems, but constructing explicit symplectic algorithms in general relativity can be challenging. Implicit symplectic integrators, such as the midpoint rule, are more applicable in such cases.
ASTROPHYSICAL JOURNAL
(2021)
Article
Astronomy & Astrophysics
Ying Wang, Wei Sun, Fuyao Liu, Xin Wu
Summary: This study explored the possibility of constructing explicit symplectic integrators for a Hamiltonian of charged particles moving around a Reissner-Nordstrom black hole with an external magnetic field. The proposed algorithms showed desirable properties in their long-term stability, precision, and efficiency for appropriate choices of step size. Effects of black hole's charge, Coulomb part of electromagnetic potential, and magnetic parameter on the dynamical behavior were investigated.
ASTROPHYSICAL JOURNAL
(2021)
Article
Physics, Multidisciplinary
Seung-Sup B. Lee, Fabian B. Kugler, Jan von Delft
Summary: Local three- and four-point correlators play a crucial role in understanding strongly correlated systems, and a new numerical renormalization group approach is introduced to efficiently compute them, providing insights into multiple particle excitations even at the lowest energies. Exemplary results demonstrate the method's versatility in handling a wide range of temperatures and frequencies, from large to arbitrarily small ones.
Article
Physics, Multidisciplinary
Fabian B. Kugler, Seung-Sup B. Lee, Jan von Delft
Summary: This passage discusses two approaches to studying the many-body problem, connecting results through spectral representations. Generalized spectral representations for multipoint correlation functions in various many-body frameworks are derived, emphasizing the relationship and properties of the different formalisms. Numerical results for specific models are presented, analyzing the evolution of the vertex at different temperatures and interactions in Matsubara and Keldysh formalisms.
Article
Physics, Multidisciplinary
Tianyu Zhu, Garnet Kin-Lic Chan
Summary: The paper introduces a new ab initio formulation of dynamical mean-field theory for predicting electronic properties in correlated materials without empirical truncations and parameters. By employing a full cell GW + DMFT approach, the method successfully tackles large impurity problems without the need for approximations.
Article
Education & Educational Research
Dewi Muliyati, Dadan Sumardani, Siswoyo Siswoyo, Fauzi Bakri, Handjoko Permana, Erfan Handoko, Ni Larasati Kartika Sari
Summary: Computational thinking is an essential skill in the 21st century, and using worksheets in a computational physics course can help practice CT effectively. Expert evaluation showed that the modified course significantly improved students' overall CT skills, while the cooperative learning aspect did not show improvement. The experiment conducted during the COVID-19 pandemic revealed an impact on students' collaborative skills in the course.
EDUCATION AND INFORMATION TECHNOLOGIES
(2022)
Article
Computer Science, Interdisciplinary Applications
L. Chiabo, G. Sanchez-Arriaga
Summary: This study investigates the physical and numerical limitations of stationary Vlasov-Poisson solvers based on backward Liouville methods. The results show that for cases where eccentricity is not equal to 0, angular momentum is not conserved and particle dynamics in phase space is a mix of regular and chaotic orbits.
JOURNAL OF COMPUTATIONAL PHYSICS
(2021)
Article
Education & Educational Research
Rebecca Vieyra, Joshua Himmelsbach
Summary: This study examined how physics teachers conceptualize integrated computational modeling, finding that some teachers were more inclined towards interdisciplinary boundary-stretching while others focused on intradisciplinary boundary stretching. Teachers with more boundary-stretching indicators at the outset of integrated curriculum development workshops were more likely to implement computational modeling-integrated materials in their physics classrooms.
JOURNAL OF SCIENCE EDUCATION AND TECHNOLOGY
(2022)
Article
Physics, Fluids & Plasmas
Alejandro Malagon-Romero, Alejandro Luque
Summary: In this study, we investigate the influence of humidity on the propagation of streamers in air. Our findings indicate that there are differences in streamer propagation between dry and humid air, primarily attributed to the enhanced effective attachment rate in humid air, resulting in higher electric fields and threshold fields for breakdown. The higher effective attachment rate in humid conditions leads to a faster decay of conductivity in the streamer channel, hindering charge accumulation in the streamer head.
PLASMA SOURCES SCIENCE & TECHNOLOGY
(2022)