Explanipedia

Obituary: Fernando Haas (1970–2024) Open

Giovanni Manfredi, Antoine Bret, Gert Brodin, I. Kourakis, M. Marklund , et al. · 2025

The plasma physics community mourns the loss of Professor Fernando Haas, a distinguished Brazilian physicist, who passed away on December 2, 2024. For the last 25 years, Fernando was a highly active researcher in the field of theoretical q…

Resonant Axion-Plasmon Conversion in Neutron Star Magnetospheres Open

Hugo Terças, J. T. Mendonça, R. Bingham · 2025

Resonant axion-plasmon conversion in the magnetospheres of magnetars may substantially impact the landscape of dark-matter axion detection. This Letter explores how resonant axion-plasmon conversion modify the expected radio signals from a…

Resonant axion-plasmon conversion in neutron star magnetospheres Open

Hugo Terças, J. T. Mendonça, R. Bingham · 2025

Resonant axion-plasmon conversion in the magnetospheres of magnetars may substantially impact the landscape of dark-matter axion detection. This work explores how resonant axion-plasmon conversion, through a mechanism that is analogous to …

Temporal Faraday and Other Magneto-Optic Effects Open

J. T. Mendonça · 2025

We consider temporal optical effects in the presence of static fields, and more generally in anisotropic optical media, such as magnetized materials. Magneto-optical effects are due not just to phase shifts between the different eigenmodes…

Quantum kinetic theory of light-matter interactions in degenerate plasmas Open

J. L. Figueiredo, J. T. Mendonça, Hugo Terças · 2024

A rigorous treatment of light-matter interactions typically requires an interacting quantum field theory. However, most applications of interest are handled using classical or semiclassical models, which are valid only when quantum-field f…

Temporal Magneto-Optics Open

J. T. Mendonça · 2024

We consider temporal optical effects in the presence of static fields, and more general, in anisotropic optical materials. We show that magneto-optical effects can occur due to temporal variations of the refractive index. Faraday rotations…

Time-Refraction and Spacetime Optics Open

J. T. Mendonça · 2024

A review of recent advances in spacetime optics is given, with special emphasis on time-refraction. This is a basic optical process, occurring at a temporal discontinuity or temporal boundary, that is able to produce various different effe…

TIME REFRACTION and SPACETIME OPTICS Open

J. T. Mendonça · 2024

A review of recent advances in spacetime optics is given, with special emphasis on time refraction. This is a basic optical process, occurring at a temporal discontinuity or temporal boundary, which is able to produce various different eff…

Time-Refraction and Spacetime Optics Open

J. T. Mendonça · 2024

A review of recent advances in spacetime optics is given, with special emphasis on time-refraction. This is a basic optical process, occurring at a temporal discontinuity ou temporal boundary, that is able to produce various different effe…

Penrose Scattering in Quantum Vacuum Open

J. T. Mendonça · 2024

This paper considers the scattering of a probe laser pulse by an intense light spring in a QED vacuum. This new scattering configuration can be seen as the vacuum equivalent to the process originally associated with the scattering of light…

Penrose Scattering in Quantum Vacuum Open

J. T. Mendonça · 2024

Scattering of a probe laser pulse by an intense light spring in QED vacuum is considered. This new scattering configuration can be seen as the vacuum equivalent to the process originally associated with scattering of light by a rotating bl…

Ophthalmopathies in Dogs with Visceral Leishmaniasis - Treatment with Allopurinol and Diagnosis by qPCR and Cytology Open

S. Carvalho, Karina Mescouto de Melo, J. T. Mendonça, Luana Dias de Moura, Elyse Medeiros Olimpio Bomfim , et al. · 2024

Background: Canine visceral leishmaniasis (CVL) is an infectious parasitic zoonotic disease endemic to several countries. Among the most common clinical symptoms of CVL are eye symptoms. The association between clinical, epidemiological an…

Photon Acceleration by Superluminal Ionization Fronts Open

J. T. Mendonça · 2024

This paper explores the use of superluminal ionization fronts to accelerate and amplify electromagnetic radiation. These fronts are defined as optical boundaries between two regions of a gas, the neutral region and the plasma region, chara…

Information compression at the turbulent phase transition in cold-atom gases Open

Ruggero Giampaoli, J. L. Figueiredo, João D. Rodrigues, J. A. Rodrigues, Hugo Terças , et al. · 2023

The statistical properties of physical systems in thermal equilibrium are blatantly different from their far-from-equilibrium counterparts. In the latter, fluctuations often dominate the dynamics and might cluster in ordered patterns in th…

Photon Acceleration by Superluminal Ionization Fronts Open

J. T. Mendonça · 2023

In this paper, we explore the use of superluminal ionization fronts to accelerate and amplify electromagnetic radiation. These fronts are defined as optical boundaries between two regions of a gas, the neutral region and the plasma region,…

Superdiffusion of vortices in two-component quantum fluids of light Open

M. Roldão, J. L. Figueiredo, Pedro Monteiro, J. T. Mendonça, Hugo Terças · 2023

The quantum diffusion of a vortex in a two-component quantum fluid of light is investigated. In these systems, the Kerr nonlinearity promotes interactions between the photons, displaying features that are analogue of a Bose-Einstein conden…

Particle-pair creation by high-harmonic laser fields Open

J. T. Mendonça · 2023

We consider the dynamical pair-creation by intense electric fields in vacuum, based on exact solutions of the Dirac equation using the temporal Klein process. This approach gives a simple interpretation of the QED processes associated with…

Compton Scattering of Plasmons Open

J. T. Mendonça, Fernando Haas · 2023

We extend de concept of Compton scattering to the case of plasmons. This concept was originally applied to electrons in vacuum. Here, we consider electrons in a plasma, and study the scattering properties of photon-plasmon interactions. We…

Plasmon dispersion and Landau damping in the nonlinear quantum regime Open

Fernando Haas, J. T. Mendonça, Hugo Terças · 2023

We study the dispersion properties of electron plasma waves, or plasmons, which can be excited in quantum plasmas in the nonlinear regime. In order to describe nonlinear electron response to finite amplitude plasmons, we apply the Volkov a…

Landau damping and particle trapping in the quantum regime Open

J. T. Mendonça · 2023

We review research on electron plasma waves and Landau damping in the quantum regime. Quantum kinetic equations are also briefly reviewed. Particle trapping, harmonic fields, Volkov states in plasmas and other nonlinear effects are discuss…

Compton scattering of plasmons Open

J. T. Mendonça, Fernando Haas · 2023

We extend de concept of Compton scattering to the case of plasmons. This concept was originally applied to electrons in vacuum. Here, we consider electrons in a plasma, and study the scattering properties of photon-plasmon interactions. We…

Bose-Einstein condensation of photons in microcavity plasmas Open

J. L. Figuiredo, Hugo Terças, J. T. Mendonça · 2022

Bose--Einstein condensation of a finite number of photons propagating inside a plasma-filled microcavity is investigated. The nonzero chemical potential is provided by the electrons, which induces a finite photon mass allowing condensation…

Particle acceleration by twisted laser beams Open

J. T. Mendonça, J. Vieira, Camilla Willim, R. Fedele · 2022

We consider particle acceleration in plasmas, using twisted laser beams, or beams with orbital angular momentum. We discuss different acceleration processes using two LG laser modes, which include donut wakefield, beat-wave and self-torque…

Magnetic properties of twisted plasmons Open

J. T. Mendonça · 2022

We consider the linear and nonlinear properties of twisted plasmons propagating in a magnetized plasma. Twisted plasmons are electron plasma waves with a finite amount of angular momentum. In contrast with plane plasma waves, which propaga…

Quasi-Static and Dynamic Photon Bubbles in Cold Atom Clouds Open

João D. Rodrigues, Ruggero Giampaoli, J. A. Rodrigues, António V. Ferreira, Hugo Terças , et al. · 2022

Turbulent radiation flow is ubiquitous in many physical systems where light–matter interaction becomes relevant. Photon bubble instabilities, in particular, have been identified as a possible source of turbulent radiation transport in astr…

Twisted Waves near a Plasma Cutoff Open

J. T. Mendonça, Camilla Willim, J. Vieira · 2022

This work considers twisted wave propagation in inhomogeneous and unmagnetised plasma, and discusses the wave properties in the cutoff region. The qualitative differences between twisted waves described by a single Laguerre–Gauss (LG) mode…

Dark Solitons in a Paraxial Superfluid of Light Open

S. Ali, J. T. Mendonça, I. Kourakis · 2022

Controlled beat-wave Brillouin scattering in the ionosphere Open

Bengt Eliasson, A. Senior, M. T. Rietveld, A. D. R. Phelps, R. A. Cairns , et al. · 2021

Temporal Klein Model for Particle-Pair Creation Open

J. T. Mendonça · 2021

This work considers the creation of electron-positron pairs from intense electric fields in vacuum, for arbitrary temporal field variations. These processes can be useful to study quantum vacuum effects with ultra-intense lasers. We use th…

Schrödinger–Newton Model with a Background Open

J. T. Mendonça · 2021

This paper considers the Schrödinger–Newton (SN) equation with a Yukawa potential, introducing the effect of locality. We also include the interaction of the self-gravitating quantum matter with a radiation background, describing the effec…

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