Article
Materials Science, Multidisciplinary
C. Wang, X. R. Wang
Summary: The study investigates the robustness of helical hinge states of three-dimensional weak second-order topological insulators against disorders and reveals that these states remain robust while the quantized conductance is fragile in the presence of weak disorders. As disorder increases, the system undergoes a series of quantum phase transitions, indicating the genuine state of matters in WSOTI phase.
Article
Physics, Multidisciplinary
Abouzeid M. Shalaby
Summary: We propose a new parametrization for hypergeometric approximants to accommodate perturbative and non-perturbative information, which has shown promising results in quantum mechanical problems. Our approach leads to accurate results with a relatively low order from perturbation series and demonstrates a clear improvement over previous six-loop results.
Article
Chemistry, Physical
David Mester, Mihaly Kallay
Summary: This study extends the reduced-cost scheme based on the frozen virtual natural orbital and natural auxiliary function approaches to core excitations. The efficiency of the approximation is evaluated for the second-order algebraic-diagrammatic construction (ADC(2)) method using the core-valence separation (CVS) and density fitting approaches. The results demonstrate significant computational savings with a moderate error, making the approach feasible for larger systems.
JOURNAL OF CHEMICAL THEORY AND COMPUTATION
(2023)
Article
Materials Science, Multidisciplinary
C. Wang, X. R. Wang
Summary: The study investigates the transport behavior of chiral hinge states in disordered non-Hermitian three-dimensional second-order topological insulators (3DSOTIs) and finds deviations from the behavior of Hermitian systems. Numerical calculations confirm the robustness of hinge states in disordered non-Hermitian 3DSOTIs and reveal that the fluctuations in transmission coefficients are due to incoherent scatterings of non-Hermitian potentials. These findings are also applicable to one-dimensional chiral channels in other topological materials.
Article
Chemistry, Physical
Ilia M. Mazin, Alexander Yu Sokolov
Summary: This study presents a new implementation and benchmark of approximations in multireference algebraic diagrammatic construction theory for simulations of neutral electronic excitations and UV/vis spectra of strongly correlated molecular systems. The results demonstrate that the proposed MR-ADC methods outperform third-order single-reference ADC approximation for weakly correlated electronic states and are competitive with equation-of-motion coupled cluster theory results. For states with multireference character, the performance of the MR-ADC methods is similar to that of N-electron valence perturbation theory.
JOURNAL OF CHEMICAL THEORY AND COMPUTATION
(2021)
Article
Materials Science, Multidisciplinary
Suik Cheon, Gil Young Cho, Ki-Seok Kim, Hyun-Woo Lee
Summary: This article discusses the possibility of realizing the chiral anomaly in noncentrosymmetric systems without pairs of Weyl points, where spin-orbit coupling induces nonzero Berry curvature flux through Fermi surfaces. This phenomenon affects both charge and spin transport properties, leading to the emergence of new physical effects.
Article
Chemistry, Multidisciplinary
Xiaobo Li, Mengmeng Meng, Shaoyun Huang, Congwei Tan, Congcong Zhang, Hailin Peng, H. Q. Xu
Summary: We experimentally studied the quantum transport in a topological insulator Bi2Te3 nanoplate and found that the carrier density in the nanoplate decreases while the mobility increases with decreasing top-gate voltage. Low-field magnetotransport measurements showed weak anti-localization characteristics. By considering the surface-bulk coherent electron scattering, we extracted important parameters such as dephasing times, diffusion coefficients, and surface-bulk scattering times, which helped us understand the quantum transport measurements at low temperatures.
Article
Mathematics, Applied
Jiajia Pan, Huiyuan Li
Summary: The proposed weak Galerkin spectral element method introduces weak functions and weak derivatives to solve second order partial differential equations, which is validated through numerical experiments for both typical square and L-shaped domains.
JOURNAL OF COMPUTATIONAL AND APPLIED MATHEMATICS
(2021)
Review
Chemistry, Physical
Hui-Juan Yan, Zongbao Li, Shun-Chang Liu, Xia Wang, Xing Zhang, Ding-Jiang Xue, Jin-Song Hu
Summary: The study reveals that germanium disulfide (GeS2) is a new type of two-dimensional material with weak interlayer coupling, originated from the weak hybridization of interlayer sulfur atoms. The thickness-dependent Raman spectra of GeS2 show minimal changes as thickness increases, and a small first-order temperature coefficient was obtained from temperature-dependent Raman spectra, confirming the weak interlayer coupling in GeS2.
Article
Physics, Multidisciplinary
Connor Lenihan, Aaram J. Kim, Fedor S. imkovic Iv, Evgeny Kozik
Summary: Diagrammatic Monte Carlo offers an unbiased probe of continuous phase transitions, allowing the detection of the transition with controlled error bars from an analysis of the series coefficients alone. Using the example of the Neel transition in the 3D Hubbard model, the method surpasses finite-size techniques at low temperatures and allows for mapping the phase diagram in the doped regime.
PHYSICAL REVIEW LETTERS
(2022)
Article
Materials Science, Multidisciplinary
Alexander Mook, Sebastian A. Diaz, Jelena Klinovaja, Daniel Loss
Summary: The study reveals a second-order TMI state in three-dimensional ferromagnets, characterized by excitations at the hinges, and shows the possibility of tunability through atomic-level engineering for robust topological protection. The findings empower magnonics with higher-order topology tools, offering a promising route for low-energy information transfer with three-dimensional vertical integration.
Article
Astronomy & Astrophysics
G. Fejos
Summary: This study calculates the renormalization group flows of perturbatively renormalizable interactions in the three-dimensional Ginzburg-Landau potential for the chiral phase transition of three-flavor quantum chromodynamics. Contrary to common belief, a fixed point capable of describing a second-order phase transition in the infrared exists in the system. This challenges long-standing assumptions about the transition order.
Article
Computer Science, Interdisciplinary Applications
Wei Liu, Yanping Chen, Zhifeng Wang, Jian Huang
Summary: This paper investigates the coupling of a slightly compressible Darcy-Brinkman-transport problem in fractured media with higher Reynolds numbers. It introduces a new two-layer reduced coupled model that treats the fracture as a hyperplane. The finite difference method is used to solve the new model on staggered nonuniform grids, and the uniqueness, existence, and convergence rate of the numerical method are derived. Experimental results demonstrate the accuracy and efficiency of the method, and numerical analysis showcases the behavior of fluid flow and solute transport in different types of fractures in the media.
JOURNAL OF COMPUTATIONAL PHYSICS
(2023)
Article
Materials Science, Multidisciplinary
Y. Avishai, Y. B. Band
Summary: This study investigates the forward scattering of Dirac electrons in graphene within a rectangular potential barrier, revealing the role of the Klein paradox in graphene spintronics. The research shows that under certain conditions, the transmission coefficient can approximate to zero, with sensitivity to lambda and u(0), and the spin current density exhibits spatial dependence.
Article
Chemistry, Physical
Adem Halil Kulahlioglu, Dirk Rehn, Andreas Dreuw
Summary: The quantum Monte Carlo algebraic diagrammatic construction (QMCADC) method solves the eigenvalue problem of the second-order ADC scheme for polarization propagator stochastically within the QMC framework, allowing for massively parallel computations and reducing memory requirements. By exploiting the sparsity of the effective ADC matrix and distributing memory and processing loads to different computing nodes, fast parallel computing resources can be utilized. The method is shown to provide genuine stochastic solutions to the ADC eigenvalue problem with marginal controllable error, accurately calculating the lowest vertical excitation energy of various molecular systems.
JOURNAL OF CHEMICAL PHYSICS
(2022)