Zobrazeno 1 - 10
of 551
pro vyhledávání: '"Paulo A. Maia"'
Autor:
Aroaldo S. Santos, Pedro H. Pereira, Patrícia P. Abrantes, Carlos Farina, Paulo A. Maia Neto, Reinaldo de Melo e Souza
Publikováno v:
Entropy, Vol 26, Iss 6, p 527 (2024)
In this paper, we present a systematic approach to building useful time-dependent effective Hamiltonians in molecular quantum electrodynamics. The method is based on considering part of the system as an open quantum system and choosing a convenient u
Externí odkaz:
https://doaj.org/article/2588724a8b06420d8aead17f18fcb84b
Autor:
Lucas Alonso, Guilherme C. Matos, François Impens, Paulo A. Maia Neto, Reinaldo de Melo e Souza
Publikováno v:
Entropy, Vol 26, Iss 3, p 251 (2024)
A mirror subjected to a fast mechanical oscillation emits photons out of the quantum vacuum—a phenomenon known as the dynamical Casimir effect (DCE). The mirror is usually treated as an infinite metallic surface. Here, we show that, in realistic ex
Externí odkaz:
https://doaj.org/article/e3f1e34c464e493bb89f5b93985d056b
The Dzyaloshinskii-Lifshitz-Pitaevskii (DLP) theory of Casimir forces predicts a repulsion between two material surfaces separated by a third medium with an intermediate dielectric function. This DLP repulsion paradigm constitutes an important exampl
Externí odkaz:
http://arxiv.org/abs/2410.18961
Autor:
Diniz, Kainã, Schoger, Tanja, Fonseca, Arthur L., Dutra, Rafael S., Ether Jr, Diney S., Ingold, Gert-Ludwig, Pinheiro, Felipe A., Viana, Nathan B., Neto, Paulo A. Maia
When microspheres are illuminated by tightly focused vortex beams, they can be trapped in a non-equilibrium steady state where they orbit around the optical axis. By using the Mie-Debye theory for optical tweezers, we demonstrate that the orbital per
Externí odkaz:
http://arxiv.org/abs/2409.03724
Autor:
Diniz, Kainã, Schoger, Tanja, Moura, Guilherme T., Fonseca, Arthur L., Ether Jr, Diney S., Dutra, Rafael S., Ingold, Gert-Ludwig, Viana, Nathan B., Neto, Paulo A. Maia
Publikováno v:
Phys. Rev. A 110, 013513 (2024)
We demonstrate a new method for determining the radius of micron-sized particles trapped by a vortex laser beam. The technique is based on measuring the rotation experienced by the center of mass of a microsphere that is laterally displaced by a Stok
Externí odkaz:
http://arxiv.org/abs/2312.17332
Publikováno v:
Universe, Vol 7, Iss 5, p 129 (2021)
We consider the Casimir interaction energy between a plane and a sphere of radius R at finite temperature T as a function of the distance of closest approach L. Typical experimental conditions are such that the thermal wavelength λT=ℏc/kBT satisfi
Externí odkaz:
https://doaj.org/article/316d715a0c50428386a326152660a63b
Autor:
Renan O. Nunes, Benjamin Spreng, Reinaldo de Melo e Souza, Gert-Ludwig Ingold, Paulo A. Maia Neto, Felipe S. S. Rosa
Publikováno v:
Universe, Vol 7, Iss 5, p 156 (2021)
We investigate the Casimir interaction between two dielectric spheres immersed in an electrolyte solution. Since ionized solutions typically correspond to a plasma frequency much smaller than kBT/ħ at room temperature, only the contribution of the z
Externí odkaz:
https://doaj.org/article/38279f72058749d49d4590c3f480fa4c
Autor:
Giuseppe Bimonte, Benjamin Spreng, Paulo A. Maia Neto, Gert-Ludwig Ingold, Galina L. Klimchitskaya, Vladimir M. Mostepanenko, Ricardo S. Decca
Publikováno v:
Universe, Vol 7, Iss 4, p 93 (2021)
We present results on the determination of the differential Casimir force between an Au-coated sapphire sphere and the top and bottom of Au-coated deep silicon trenches performed by means of the micromechanical torsional oscillator in the range of se
Externí odkaz:
https://doaj.org/article/2d4a6486c28c4d0daf76f27a581379f0
Autor:
da Fonseca, Arthur Luna, Diniz, Kainã, Monteiro, Paula Borges, Pires, Luís Barbosa, Moura, Guilherme Tenório, Borges, Mateus, Dutra, Rafael de Sousa, Ether Jr, Diney Soares, Viana, Nathan Bessa, Neto, Paulo Américo Maia
We demonstrate a bistable optical trap by tightly focusing a vortex laser beam. The optical potential has the form of a Mexican hat with an additional minimum at the center. The bistable trapping corresponds to a non-equilibrium steady state (NESS),
Externí odkaz:
http://arxiv.org/abs/2311.04737
Autor:
Spreng, Benjamin, Berthoumieux, Hélène, Lambrecht, Astrid, Bitbol, Anne-Florence, Neto, Paulo A. Maia, Reynaud, Serge
Publikováno v:
2024 New J. Phys. 26 013009
The electromagnetic Casimir interaction between dielectric objects immersed in salted water includes a universal contribution that is not screened by the solvent and therefore long-ranged. Here, we study the geometry of two parallel dielectric cylind
Externí odkaz:
http://arxiv.org/abs/2306.14059