Article
Astronomy & Astrophysics
Natsumi Ikeno, Wei-Hong Liang, Genaro Toledo, Eulogio Oset
Summary: We present a mechanism for Omega(c) -> pi(+)Omega (2012) production through an external emission Cabibbo favored weak decay mode, where the Omega(2012) is dynamically generated from the interaction of (K) over bar Xi(*) (1530) and eta Omega. The results show that Omega(2012) decays to (K) over bar Xi and are consistent with Belle data. Furthermore, the direct decays Omega(0)(c) -> pi K-+(-)Xi(0) and Omega(0)(c) -> pi(+)(K) over bar Xi* pi(+)eta Omega, account for about (12-20)% of the total Omega(c) -> pi K-+(-)Xi(0) decay rate.
Article
Astronomy & Astrophysics
Genevieve Belanger, Sarif Khan, Rojalin Padhan, Manimala Mitra, Sujay Shil
Summary: The framework successfully generates eV masses of light neutrinos via the seesaw mechanism, and accommodates a feebly interacting massive particle (FIMP) as a dark matter candidate. The correlation between the vev of the gauge singlet scalar field and the mass of dark matter was explored, considering the relic density constraint. Exploration of the constraints from the light neutrino masses in this setup was also conducted.
Article
Multidisciplinary Sciences
Huan Yang, Xin-Yao Wang, Zhen Su, Jin Cao, De-Chao Zhang, Jun Rui, Bo Zhao, Chun-Li Bai, Jian-Wei Pan
Summary: The formation of triatomic molecules in mixtures of ultracold atoms and diatomic molecules using Feshbach resonance remains challenging. However, evidence of triatomic molecule association near the Feshbach resonance has been reported, and the binding energy of the triatomic molecules has been estimated.
Article
Multidisciplinary Sciences
Qingjia Zhou, Yangyang Fu, Lujun Huang, Qiannan Wu, Andrey Miroshnichenko, Lei Gao, Yadong Xu
Summary: Researchers have proposed a method to achieve geometrical-symmetry-free but symmetry-protected bound states in the continuum (BICs) using a zero-index metamaterial (ZIM), finding that these BICs are protected by physical symmetries. This approach provides a way to realize higher-order BICs and link their properties to the disorder of photonic systems.
NATURE COMMUNICATIONS
(2021)
Article
Materials Science, Multidisciplinary
Gino Wegner, Dan-Nha Huynh, N. Asger Mortensen, Francesco Intravaia, Kurt Busch
Summary: The paper discusses the impact of an extended model proposed by Halevi on the nonlocal response of plasmonic materials and nanostructures. It reevaluates the Mie scattering coefficients for a cylinder and corresponding plasmon-polariton resonances within this framework. The analysis reveals a nonlocal, collisional, and size-dependent damping term that affects the resonances in the extinction spectrum. The implementation of the Halevi model in the time domain is particularly important for efficient and accurate modeling of nanogap structures and other nanoscale features in nanoplasmonics applications.
Article
Physics, Multidisciplinary
Luohong Liu, Tianzi Li, Qicheng Zhang, Meng Xiao, Chunyin Qiu
Summary: We propose a simple but universal mirror-stacking approach to turn nontrivial bound states of any topological monolayer model into topological bound states with extraordinary robustness. By tuning the interlayer couplings, the topological bound state of one subspace can move into and out of the continuum of the other subspace continuously without hybridization. We construct one-dimensional first-order and two-dimensional higher-order topological bound states and demonstrate them unambiguously by acoustic experiments.
PHYSICAL REVIEW LETTERS
(2023)
Article
Physics, Nuclear
Oliver C. Gorton, Jutta E. Escher
Summary: This paper examines the validity of the Weisskopf-Ewing approximation for determining unknown (n, n') and (n, 2n) cross sections from surrogate reaction data. The study finds that the Weisskopf-Ewing approximation can estimate peak cross sections, but the shape of the (n, n') and (n, 2n) cross sections, especially for low neutron energies, cannot be reliably determined without accounting for the angular-momentum differences between the neutron-induced and surrogate reaction.
Article
Astronomy & Astrophysics
Shu-Yi Kong, Jun-Tao Zhu, Dan Song, Jun He
Summary: In this work, heavy-strange meson systems were systematically investigated to study possible molecules using a quasipotential Bethe-Salpter equation approach and one-boson exchange model. Molecular states were found and their relationships were explored, shedding light on the internal structure of various heavy-strange mesons.
Article
Optics
Peng Hu, Jiajun Wang, Qiao Jiang, Jun Wang, Lei Shi, Dezhuan Han, Z. Q. Zhang, C. T. Chan, Jian Zi
Summary: This study classifies different types of bound states in the continuum (BICs) in photonic-crystal slabs and reveals the origin of these BICs. It shows that single-resonance parametric BICs are formed through the coupling of guided resonance and Fabry-Perot modes, while symmetry-protected BICs are formed through the coupling of degenerate guided resonance modes. A global phase diagram of BICs can be obtained based on this classification, and phase transitions can be observed when BICs are created or annihilated.
Article
Nanoscience & Nanotechnology
Yan Qiao, Zhan Shi, Yutao Xu, Xueyong Wei, Alaaeldin Elhady, Eihab Abdel-Rahman, Ronghua Huan, Wenming Zhang
Summary: In this work, we propose a novel MEMS bifurcation sensor that exploits 1:3 internal resonance to achieve frequency unlocking. The sensor can operate in binary and analog modes, depending on the detection mechanism used. Experimental results demonstrate high charge resolutions of up to 0.137 fC in binary mode and 0.01 fC in analog mode. This binary sensor offers new opportunities for high-performance ultrasensitive sensors due to the excellent frequency stability and high signal-to-noise ratio.
MICROSYSTEMS & NANOENGINEERING
(2023)
Article
Chemistry, Physical
Stephen R. Slimak, Kenneth D. Jordan, Michael F. Falcetta
Summary: This study elucidates the role of overlap in the interaction between discrete and discretized continuum states in the application of the stabilization method to temporary anion states. The results show that even a simple treatment can predict a complex resonance energy in good agreement with the exact result, and the curvature in the coupling between states is responsible for the complex stationary point associated with the resonance.
JOURNAL OF PHYSICAL CHEMISTRY A
(2021)
Article
Optics
Harry Miyosi Silalahi, Yin-Pei Chen, Yi-Hong Shih, Yu-Shao Chen, Xin-Yu Lin, Jih-Hsin Liu, Chia-Yi Huang
Summary: A simple method is proposed to increase the refractive index sensitivities of terahertz metamaterials, enabling them to detect low-concentration proteins and potentially dangerous viruses. The floating terahertz metamaterial provides an extremely large refractive index sensitivity of 532 GHz/RIU and is a significant achievement in the development of protein sensors.
PHOTONICS RESEARCH
(2021)
Article
Optics
Wei Wang, Fengping Yan, Zhi Wang, Haisu Li, Guifang Wu, Siyu Tan, Xuemei Du, Ting Li, Xiangdong Wang, Hao Guo, Ting Feng
Summary: We present a simple design of a metamaterial absorber (MA) based on a two-dimensional trenched metal meta-grating, which exhibits a single ultra-narrow absorption resonance within a clean background spectrum ranging from 0 to 2 THz. The absorption resonance features a linewidth of 0.4 GHz and a Q factor of 2407, thanks to interference effect and the introduction of an air trench. The MA sensor shows excellent sensing performance with high saturated thickness, maximum sensitivity, and maximum sensing figure of merit.
OPTICS AND LASER TECHNOLOGY
(2023)
Article
Astronomy & Astrophysics
R. Molina, E. Oset
Summary: We study the mass distribution of D(S)(+)i Pi(-) in the B-0 -> (DDS+)-D-0 Pi(-)decay and find a peak near the thresholds of D (*) (s)rho and D* K*. By incorporating the interactions between D*K* and D (*) (s)rho as coupled channels in the B-0 decay, we obtain a structure that leads to a peak in the D-S(+) Pi(-) mass distribution. We conclude that the interaction between D*K* and D (*) (s)rho is essential for the observed cusp structure and that the experimental width is mainly determined by the decay width of the rho meson. The peak, along with a smooth background, reproduces the experimental mass distribution in the B (0)-> (DDS+)-D-0 Pi(-) decay fairly well.
Article
Mathematics, Applied
A. D. Morozov, K. E. Morozov
Summary: This study focuses on quasiperiodic perturbations of two-dimensional nearly Hamiltonian systems with a limit cycle, investigating the behavior of solutions near a degenerate resonance and the synchronization problem. Bifurcations of quasiperiodic solutions near a resonance phase curve are examined, based on an analysis of an autonomous pendulum-type system and its two possible topological structures. Control parameter intervals corresponding to oscillatory synchronization are identified for each case, and the results are applied to a Duffing-Van der Pol-type equation.
Article
Multidisciplinary Sciences
Manuel Gadella, Jose Hernandez-Munoz, Luis Miguel Nieto, Carlos San Millan
Summary: This work investigates the supersymmetric partners of self-adjoint extensions of the -d(2)/dx(2) differential operator on the one-dimensional infinite square well. It classifies the extensions based on the energy levels of the ground state and finds that extensions with positive energy have an infinite sequence of supersymmetric partners. Eigenvalues for these extensions are determined to be infinite and the study shows a purely discrete spectrum for all extensions.
Editorial Material
Physics, Multidisciplinary
Manuel Gadella, Jose Tadeu Lunardi, Luiz A. Manzoni
FRONTIERS IN PHYSICS
(2021)
Article
Mathematics, Applied
J. J. Alvarez-Sanchez, M. Gadella, L. P. Lara
Summary: The one-step matrix method developed aims to obtain approximate solutions for first-order nonlinear systems and nonlinear ordinary differential equations reducible to first-order systems. The method is shown to converge to the exact solution with high precision, and its advantage over other commonly used methods lies in its simplicity of implementation.
MATHEMATICAL METHODS IN THE APPLIED SCIENCES
(2021)
Article
Multidisciplinary Sciences
Enrico Celeghini, Manuel Gadella, Mariano A. del Olmo
Summary: The article discusses constructing bases in the space of square integrable functions on the unit circle and l(2)(Z) using normalized Hermite functions, which are related through Fourier transforms. The Gramm-Schmidt method is used for building orthonormal bases with ladder operators similar to those of the one-dimensional quantum oscillator. Rigging was constructed for both spaces to ensure continuity of operators mentioned.
Article
Physics, Multidisciplinary
S. Fassari, M. Gadella, L. M. Nieto, F. Rinaldi
Summary: This paper provides a detailed description of the eigenvalues of the self-adjoint Hamiltonian operator representing the negative Laplacian on the positive half-line with Dirichlet or Neuman boundary conditions perturbed by an attractive Dirac distribution, and investigates their dependence on coupling constant lambda and position parameter x0. The paper also shows resonances as poles of the analytic continuation of the resolvent in both systems, connecting these results to the study of the ground state energy of three-dimensional self-adjoint operators perturbed by attractive delta-distributions on a spherical shell.
EUROPEAN PHYSICAL JOURNAL PLUS
(2021)
Article
Multidisciplinary Sciences
Silvestro Fassari, Manuel Gadella, Luis Miguel Nieto, Fabio Rinaldi
Summary: This article provides an expansion (up to the fourth order of the coupling constant) of the energy of the ground state of a quantum mechanical particle moving inside a parabolic well in the x-direction constrained by a two-dimensional impurity modelled by an attractive two-dimensional isotropic Gaussian potential, through investigating the associated Birman-Schwinger operator and using the modified Fredholm determinant to compute the energy of the ground state created by the impurity.
Article
Multidisciplinary Sciences
Enrico Celeghini, Manuel Gadella, Mariano A. del Olmo
Summary: We introduce a multi-parameter family of bases in the Hilbert space associated to Hermite functions, and show how these generalized Hermite functions are transformed under unitary representations of various groups.
Article
Mathematics
Enrico Celeghini, Manuel Gadella, Mariano A. del Olmo
Summary: This paper reviews the generalization of Euclidean and pseudo-Euclidean groups in quantum mechanics. The study finds that these groups give rise to a more general family of groups, with Euclidean and pseudo-Euclidean groups as subgroups. The paper also constructs generalized Hermite functions on multidimensional spaces and investigates their transformation laws under Fourier transform.
Article
Physics, Multidisciplinary
Manuel Gadella, Sebastian Fortin, Juan Pablo Jorge, Marcelo Losada
Summary: This article reviews some results in the theory of non-relativistic quantum unstable systems, focusing on quantum resonances and Gamow states. By introducing the properties and construction of Gamow states, as well as resonance models like the Friedrichs model, the characteristics and applications of Gamow states are explored. Additional properties of Gamow states and their potential explanations for phenomena such as the Loschmidt echo are also discussed.
Article
Mathematics, Applied
Manuel Gadella, Luis Pedro Lara
Summary: In this article, we propose a method that utilizes truncated Fourier series with variable coefficients as approximate solutions to obtain local analytic approximate solutions for ordinary differential equations and some nonlinear equations. We show that this method is equivalent to the Picard-Lindelof method under certain restrictive conditions. Through numerical experiments, we demonstrate the efficiency and excellent precision of our method, even with low iterations, when applied to equations of interest in physics.
MATHEMATICAL METHODS IN THE APPLIED SCIENCES
(2023)
Article
Multidisciplinary Sciences
Manuel Gadella, Carlos San Millan
Summary: In this paper, we classify the self adjoint extensions of the differential operator -d(2)/dx(2) and obtain the complete list of Supersymmetric (SUSY) partners with strictly positive energy. We also study the cases where the ground state has degeneracy and provide examples of their SUSY partners. The use of self adjoint determinations with ground state wave function nodes produces formal SUSY partners with finite eigenvalues or purely continuous spectrum.
Article
Mathematics
Silvestro Fassari, Manuel Gadella, Luis M. Nieto, Fabio Rinaldi
Summary: In this note, the authors evaluate and achieve an accurate approximation of a scalar product that plays a crucial role in determining the ground state energy in a two-dimensional quantum model. The calculation involves an integral operator defined in terms of the eigenfunctions of the harmonic oscillator expressed in Hermite polynomials, requiring sophisticated mathematical tools.
Article
Mathematics, Applied
Manuel Gadella, Luis Pedro Lara
Summary: We propose a modification of a Fourier analysis based method to obtain the Floquet characteristic exponents for periodic homogeneous linear systems with high precision. This modification uses a variational principle to find the correct Floquet exponents among the solutions of an algebraic equation. Once the Floquet exponents are obtained, explicit approximated solutions are determined. The accuracy of our method is verified by testing on systems with known exact solutions, including one-dimensional periodic potentials of interest in quantum physics. We also study approximate solutions for homogeneous linear equations with periodic coefficients using the equivalent linear system.
MATHEMATICAL METHODS IN THE APPLIED SCIENCES
(2023)
Article
Mathematics
Sebastian Fortin, Manuel Gadella, Federico Holik, Juan Pablo Jorge, Marcelo Losada
Summary: This review presents a rigorous algebraic method for constructing quantum unstable states, also known as Gamow states. Traditionally, these states are associated with vector states called Gamow vectors, but there are difficulties in doing so. The authors present Gamow states as functionals on algebras in a consistent way and propose a possible method for constructing averages of observables on Gamow states.
Article
Physics, Multidisciplinary
Carlos San Millan, Manuel Gadella, Senguel Kuru, Javier Negro
Summary: This paper mainly studies the scattering matrix and properties of supersymmetric transformations for one-dimensional solvable Hamiltonians with Rosen-Morse II potential.
EUROPEAN PHYSICAL JOURNAL PLUS
(2023)
