Article
Physics, Multidisciplinary
C. Garcion, N. Fabre, H. Bricha, F. Perales, S. Scheel, M. Ducloy, G. Dutier
Summary: At nanometer separation, the dominant interaction between an atom and a material surface is the fluctuation-induced Casimir-Polder potential. Slow atoms crossing a silicon nitride transmission nanograting are a remarkably sensitive probe for that potential, with a discernible 15% difference between nonretarded and retarded potentials at distances smaller than 51 nm. The study discusses the relative influence of various theoretical and experimental parameters on the potential in detail, paving the way for high-precision measurement of the Casimir-Polder potential for applications in quantum-enhanced sensing.
PHYSICAL REVIEW LETTERS
(2021)
Article
Physics, Multidisciplinary
Jamison Sloan, Nicholas Rivera, John D. Joannopoulos, Marin Soljacic
Summary: Time-varying optical media with actively modulated dielectric properties introduce novel effects in light propagation and are of current interest. In the quantum domain, time-dependent media can convert vacuum fluctuations into real photons. Despite being weak, these dynamical vacuum effects (DVEs) can be enhanced through nanophotonics techniques. This study presents a theory of weakly modulated DVEs in arbitrary nanostructured systems, incorporating time-modulation and dispersion through time-translation-breaking linear response theory. An efficient scheme for generating entangled surface polaritons is proposed based on time-modulation of the optical phonon frequency of a polar insulator.
PHYSICAL REVIEW LETTERS
(2021)
Article
Environmental Sciences
Xue Bai, Martin Fuellekrug
Summary: Traditional lightning detection and location networks use the time of arrival (TOA) technique to locate lightning events, but this study introduces a new interferometric method that expands the data use by mapping lightning events into an area using coherency. The study tests the interferometric method using an amplitude waveform bank and further develops it by using both amplitude and phase coherency of the analytic signal. To avoid interference from skywaves, two solutions are proposed: using a small receiver network or applying an impulse response function to the recorded waveforms.
Article
Biochemistry & Molecular Biology
Dhisa Minerva, Nuha Loling Othman, Takashi Nakazawa, Yukinobu Ito, Makoto Yoshida, Akiteru Goto, Takashi Suzuki
Summary: Chemotaxis plays an important role in angiogenesis, but in arterial patch grafting-induced angiogenesis, the VEGFA concentration gradient is decreasing. The formation of new blood vessels shows twisted and congested morphology, distinguishable from non-pathological vessels. Through a mathematical model and numerical simulations, we found that the growth speed of new vessels oscillates and observed crowded and congested blood vessel formation.
INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
(2022)
Article
Astronomy & Astrophysics
Philippe Brax, Anne-Christine Davis, Benjamin Elder
Summary: This paper calculates bounds and forecasts for screened modified gravity theories, focusing on the chameleon model in Casimir force experiments. Numerical simulations are compared to analytical approximations, specifically the proximity force approximation (PFA) and the screening factor approximation. Results show that the PFA does not accurately reproduce the numerical results for the chameleon model, but the screening factor approximation fares better in extracting constraints and forecasts from data.
Article
Nanoscience & Nanotechnology
Josh Javor, Zhancheng Yao, Matthias Imboden, David K. Campbell, David J. Bishop
Summary: The Casimir force, a quantum mechanical effect, has been observed in MEMS platforms and proposed as a avenue for quantum metrology. A new Casimir-driven metrology platform using time-delay-based parametric amplification technique was designed to detect weak, low-frequency gradient magnetic fields. With a reported 10,000-fold improvement in resolution for MEMS single-point gradiometers, this design has the potential to revolutionize metrology, particularly in monitoring biomagnetic fields in ambient conditions.
MICROSYSTEMS & NANOENGINEERING
(2021)
Article
Spectroscopy
Jialing Shi, Lili Ju, Xin Zhang, Yingzhou Huang, Yurui Fang
Summary: Nanogaps in nanooptics play a crucial role in enhancing electromagnetic field redistribution, which leads to various applications such as light manipulation, light harvesting, and surface enhanced spectrum. The study on gap modes of dielectric nanoparticle dimer on metal film provides insights into abnormal electric field enhancement and is further analyzed using mode hybridization theory. Experimental demonstration through surface enhanced Raman spectroscopy validates the theoretical analyses.
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
(2022)
Article
Multidisciplinary Sciences
Haofeng Zang, Zheng Xi, Zhiyu Zhang, Yonghua Lu, Pei Wang
Summary: This research demonstrates the first prototype polarization-encoded metasurface for ultrasensitive long-range transverse displacement metrology, achieving nanometer displacement resolution and a measurement range of 200 micrometers.
Article
Materials Science, Multidisciplinary
Gideon Lee, Aleksandr Rodin
Summary: The study introduces a general method for calculating the Helmholtz free energy due to vibrational modes in systems of varying dimensionality and composition, enabling the extraction of defect interaction energy between different defect configurations at different temperatures. The effectiveness of the approach is demonstrated through numerical calculations and validation using exact diagonalization.
Article
Chemistry, Physical
Youngsin Park, Guanhua Ying, Atanu Jana, Vitaly Osokin, Claudius C. Kocher, Tristan Farrow, Robert A. Taylor, Kwang S. Kim
Summary: This study focuses on the observation and control of transverse electromagnetic (TEM) modes in inorganic perovskite lasers, demonstrating the tuning of emission wavelength through pump power and temperature. The research highlights the ability to maintain a constant full width at half maximum (FWHM) without mode-hopping over the entire tuning range.
Article
Physics, Multidisciplinary
Thorsten Emig, Giuseppe Bimonte
Summary: Recent measurements of Casimir forces have shown that quantum fluctuations of the electromagnetic field undergo intricate modifications in complex geometries. In this paper, a multiple scattering description is introduced for calculating Casimir interactions between bodies of arbitrary shape and material composition. This approach allows for the calculation of interactions in complex geometries using just a few wave scatterings, without any prior knowledge of the scattering amplitudes of the bodies. Some initial applications demonstrate the efficacy of this method.
PHYSICAL REVIEW LETTERS
(2023)
Article
Materials Science, Multidisciplinary
K. Driscoll, A. Ralko, S. Fratini
Summary: In correlated electron systems, the metallic character of a material can be strongly suppressed near an integer concentration of conduction electrons as a result of Coulomb interactions forbidding double occupancy of local atomic orbitals. A new general route for obtaining correlated behavior, different from the Mott-Hubbard mechanism, is explored here, relying on unscreened, long-range Coulomb interactions to create a pseudogap metal phase characterized by divergent quasiparticle mass and a Coulomb pseudogap in the electronic spectrum. The Fermi-liquid state is destroyed due to the frustrating nature of long-range potentials slowing down collective charge rearrangements in the nearly frozen, disordered charge background.
Article
Chemistry, Physical
R. Kevin Kessing, Pei-Yun Yang, Salvatore R. Manmana, Jianshu Cao
Summary: In this study, the influence of a linear energy bias on nonequilibrium excitation in a chain of molecules was investigated using a random-walk rate kernel theory and a nonperturbative, massively parallelized adaptive-basis algorithm. The research uncovered structured and discrete vibronic resonance behavior, showing resonance at not only integer but also fractional ratios, which could have implications for molecular electronics and coherent quantum transport. The observations were reproduced in a model calculation of a Cy3 system, with considerations for non-nearest-neighbor coupling and initial vibrational relaxation states.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2022)
Article
Optics
Shengjie Wu, Wange Song, Zhiyuan Lin, Chen Chen, Shining Zhu, Tao LI
Summary: This study demonstrates the possibility of generating nontrivial Floquet topological phase and photonic rt modes through long-range coupling in a one-dimensional periodically driven optical lattice. Analyzing the replica bands, we reveal the quasienergies band crossing and reopening of new nontrivial rt gaps due to the long-range coupling. These results offer a new route in manipulating optical topological modes by Floquet engineering with long-range coupling.
Article
Chemistry, Multidisciplinary
Seunghyeon Cho, Kyunghun Jeon, Ki-Deok Lee, Chang-Wan Kim
Summary: In this study, the electromagnetic force induced structural vibration of a variable speed brushless direct current (BLDC) motor was analyzed using finite element analysis and experiments. A 3-D finite element model was used to predict the vibration characteristics of the motor, and the results were validated through comparison with experimental data. The study found that the 3-D finite element model accurately predicted the actual vibration characteristics of the motor under variable speed conditions.
APPLIED SCIENCES-BASEL
(2022)
Article
Physics, Multidisciplinary
C. D. Fosco, F. C. Lombardo, F. D. Mazzitelli
Article
Physics, Particles & Fields
Diana Lopez Nacir, Francisco D. Mazzitelli, Leonardo G. Trombetta
JOURNAL OF HIGH ENERGY PHYSICS
(2019)
Article
Physics, Particles & Fields
Ezequiel Alvarez, Federico Lamagna, Manuel Szewc
JOURNAL OF HIGH ENERGY PHYSICS
(2020)
Article
Education, Scientific Disciplines
Francisco D. Mazzitelli
EUROPEAN JOURNAL OF PHYSICS
(2020)
Article
Multidisciplinary Sciences
Ezequiel Alvarez, Daniela Obando, Sebastian Crespo, Enio Garcia, Nicolas Kreplak, Franco Marsico
Summary: The article proposes an algorithm to estimate the number of COVID-19 cases in real-time using data from telephone calls to a COVID-line, with validation in Buenos Aires, Argentina. The algorithm can help track the epidemic spread in real-time and provide an Early Outbreak Alarm system to detect outbreaks in advance. The key lies in the detailed tracking of uncertainties in estimations to detect anomalies.
ROYAL SOCIETY OPEN SCIENCE
(2021)
Article
Astronomy & Astrophysics
Cesar D. Fosco, Fernando C. Lombardo, Francisco D. Mazzitelli
Summary: By studying the emission probability of an atom in non-relativistic motion and its interaction with a static graphene plate, we found that the emission probability increases when the atom is near the plate and oscillating perpendicular to it, while there is a suppression for parallel oscillations. We also explored the phenomenon of quantum friction on an atom moving parallel to the plate, showing that friction only occurs when the atom's velocity exceeds the Fermi velocity of electrons in graphene.
Article
Computer Science, Interdisciplinary Applications
Ezequiel Alvarez, Mariel Estevez, Rosa Maria Sanda Seoane
Summary: Building new physics models requires extensive cross-checks with experimental results. The Z'-explorer software provides an easy way to explore available decay channels of Z' models and determine which parts are still allowed, which are to be explored soon, and which channel is the most sensitive in each parameter space region.
COMPUTER PHYSICS COMMUNICATIONS
(2021)
Article
Astronomy & Astrophysics
Ezequiel Lozano, Francisco Diego Mazzitelli
Summary: This paper considers a quantum mechanical system to model the effect of quantum fields on the early universe's evolution. The role of noise in the dynamics of the oscillator is emphasized, with the positive vacuum energy density leading to an oscillating universe instead of exponential expansion.
INTERNATIONAL JOURNAL OF MODERN PHYSICS D
(2021)
Article
Astronomy & Astrophysics
Ezequiel Alvarez, Barry M. Dillon, Darius A. Faroughy, Jernej F. Kamenik, Federico Lamagna, Manuel Szewc
Summary: Monte Carlo generators are essential for data analysis in particle collider experiments. This study proposes a novel statistical method that can distinguish the 4-top signal from background in the same-sign dilepton channel and correct for potential MC simulation errors.
Article
Astronomy & Astrophysics
S. A. Franchino-Vinas, F. D. Mazzitelli
Summary: The study examines vacuum fluctuations of a quantum scalar field in the presence of a thin and inhomogeneous mirror, demonstrating that divergences can be absorbed by a local counterterm. The remaining finite part is generally a nonlocal functional of the inhomogeneities, explicitly computed for massless fields in D = 4 dimensions. This analysis provides insights into the Casimir self-energy for partially transmitting mirrors and the probability of particle creation due to the dynamic Casimir effect with time-dependent inhomogeneities.
Article
Astronomy & Astrophysics
C. D. Fosco, F. D. Mazzitelli
Article
Astronomy & Astrophysics
M. Belen Farias, C. D. Fosco, Fernando C. Lombardo, Francisco D. Mazzitelli
Article
Astronomy & Astrophysics
Ezequiel Alvarez, Manuel Szewc
Article
Optics
F. C. Lombardo, F. D. Mazzitelli, A. Soba, P. I. Villar
Article
Astronomy & Astrophysics
Francisco D. Mazzitelli, Leonardo G. Trombetta
