Article
Physics, Multidisciplinary
Chen Zhang, Z. Y. Chen, Zheng Zhang, Y. X. Zhao
Summary: In this work, a novel theory is developed to study momentum-space nonsymmorphic space groups (k-NSGs) using projective representations of space groups. The theory can identify the corresponding real-space symmorphic space groups (r-SSGs) and construct the projective representation that leads to the k-NSG. The broad applicability of the theory is demonstrated by showing that all k-NSGs can be realized by gauge fluxes over real-space lattices.
PHYSICAL REVIEW LETTERS
(2023)
Article
Physics, Applied
Shiwen Chen, Zhongfu Li, Yu Mao, Xiaoyu Dai, Yuanjiang Xiang
Summary: This paper investigates the impact of reflection-type merging BICs on the Goos-Hanchen shift (GH shift) and demonstrates a remarkable enhancement of the GH shift, exceeding five orders of wavelength. The study highlights that even minor fabrication imperfections can result in a significant change in the GH shift, which can serve as a means for detecting manufacturing defects. Furthermore, an ultrasensitive environmental refractive index sensor based on the enhanced GH shift by an isolated BIC is proposed.
JOURNAL OF APPLIED PHYSICS
(2023)
Article
Multidisciplinary Sciences
Biao Yang, Yangang Bi, Rui-Xing Zhang, Ruo-Yang Zhang, Oubo You, Zhihong Zhu, Jing Feng, Hongbo Sun, C. T. Chan, Chao-Xing Liu, Shuang Zhang
Summary: Berry curvature, the counterpart of the magnetic field in momentum space, plays a crucial role in electron transport and topological physics. Researchers have successfully demonstrated a toroidal moment of Berry curvature in metamaterials, which has significant implications for future studies.
NATURE COMMUNICATIONS
(2021)
Article
Astronomy & Astrophysics
Adam D. Helfer
Summary: Twistors provide a satisfactory method for treating angular momentum in gravitationally radiating systems, with appealing definitions of center of mass and spin. When transitions between asymptotically Minkowskian regimes occur without supertranslation offset, the results align with those from other approaches, but differ when an offset is present. The twistor-derived change-of-origin formula parallels the special-relativistic one, with contributions from energy-momentum and direction-dependent translation derived from supertranslation.
Article
Astronomy & Astrophysics
J. A. Melendez, C. Drischler, A. J. Garcia, R. J. Furnstahl, Xilin Zhang
Summary: The article presents a fast and accurate emulator for two-body scattering observables, which combines Newton's variational method with ideas from eigenvector continuation. The emulator is shown to accurately extrapolate far from the support of the training data, providing significant improvement in CPU time when used to emulate interactions with multiple free parameters.
Article
Physics, Particles & Fields
Claudio Coriano, Matteo Maria Maglio, Dimosthenis Theofilopoulos
Summary: This study investigates the gravitational backreaction generated by coupling a general conformal sector to external, classical gravity, and discusses the regularization of topological Gauss-Bonnet and Weyl terms in these actions. It also explores both local and nonlocal expressions of these theories and shows possible conclusions for nonlocal EGB theories.
EUROPEAN PHYSICAL JOURNAL C
(2022)
Article
Physics, Particles & Fields
Claudio Coriano, Stefano Lionetti, Matteo Maria Maglio
Summary: This study analyzes the effects of parity-odd trace anomalies on parity-odd correlators. It finds that in certain cases, these correlators can be non-zero, and the presence of parity-odd trace anomalies leads to non-zero values for certain correlators.
EUROPEAN PHYSICAL JOURNAL C
(2023)
Article
Materials Science, Multidisciplinary
M. Selch, M. Suleymanov, M. A. Zubkov, C. X. Zhang
Summary: The Hall conductivity for the intrinsic anomalous quantum Hall effect in homogeneous systems is determined by a topological invariant composed of the Green function dependent on the momentum of the quasiparticle. In the presence of an external magnetic field, the expression for Hall conductivity remains valid if certain representations of the Green function are used. These representations involve infinite-dimensional matrices or the Moyal products, but they are more complicated and potentially impractical for calculations.
Article
Optics
Yujia Wu, Haigang Liu, Xianfeng Chen
Summary: This study introduces a method for measuring optical near-infrared vortex modes with frequency upconversion, which can convert a near-infrared beam into a visible beam. The number and orientation of fringes of the second harmonic intensity patterns are used to measure the optical near-infrared vortex modes. This proposed method offers a convenient and flexible way to measure different OAM of vortex beams, with potential applications in various circumstances involving vortex modes.
Article
Optics
P. A. Ameen Yasir, C. M. Chandrashekar
Summary: The researchers propose a method to achieve hyperentanglement in the different degrees of freedom of a photon (polarization, OAM, path) using an optical setup. By mapping the photon's degrees of freedom to two dimensions, they generate hyperentangled states. The amount of hyperentanglement is quantified by measuring the entanglement negativity.
Article
Physics, Multidisciplinary
Yuan Tao, Dai Han-Ning, Chen Yu-Ao
Summary: Topological pumping enables the quantized transport of matter waves through an adiabatic evolution of the system. This paper proposes an experimental scheme for realizing nonlinear topological pumping in ultracold atom systems and presents numerical calculations to determine the quantized transport characteristics of solitons in the system.
ACTA PHYSICA SINICA
(2023)
Article
Physics, Multidisciplinary
Marc Gillioz
Summary: The decomposition of 4-point correlation functions into conformal partial waves is a key tool in the study of conformal field theory. By computing scalar operator partial waves in Minkowski momentum space, a closed-form result valid in arbitrary space-time dimensions is obtained. Each conformal partial wave is expressed as a sum over ordinary spin partial waves, with coefficients that factorize into products of vertex functions dependent only on the conformal data of the incoming or outgoing operators.
Review
Nanoscience & Nanotechnology
Peng Shi, Luping Du, Xiaocong Yuan
Summary: Spin angular momentum associated with circular polarization is a fundamental aspect of photons in both classical and quantum optics. Transverse spin, perpendicular to the mean wavevector, plays a significant role in confined electromagnetic waves and leads to interesting topological spin structures and properties in the optical near-field. The concepts of spin photonics have importance in various fields like optics, topological photonics, metrology, and quantum technologies.
Article
Physics, Multidisciplinary
Jose H. D. Rivero, Liang Feng, Li Ge
Summary: This study reveals that an imaginary gauge transformation can be performed in momentum space, showing the equivalence between certain gain- and loss-modulated systems in their parity-time symmetric phases and Hermitian systems with real potentials. The analysis in momentum space also distinguishes two types of exceptional points in the same system: the conventional type that leads to a PT transition upon the continuous increase of gain and loss, and a Dirac exceptional point with real-valued energy bands in hybrid dimensions.
PHYSICAL REVIEW LETTERS
(2022)
Article
Physics, Multidisciplinary
M. Kirchbach, J. A. Vallejo
Summary: This paper presents the construction of an integral transform that converts the representation of the Hydrogen atom from space to radial momentum. The resulting wave functions are expressed explicitly using complex finite expansions of Gegenbauer functions or (elementary) trigonometric functions. The authors demonstrate the symmetry of these wave functions under the SO(4) group and establish their equivalence to the findings of Lombardi and Ogilvie.
JOURNAL OF PHYSICS A-MATHEMATICAL AND THEORETICAL
(2023)
