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Applied Sciences
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Radiative Processes in Quantum Electrodynamics: Theory, Experiments and Applications II
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Radiative Processes in Quantum Electrodynamics: Theory, Experiments and Applications II

A special issue of Applied Sciences (ISSN 2076-3417). This special issue belongs to the section "Quantum Science and Technology".

Deadline for manuscript submissions: closed (20 July 2022) | Viewed by 3921

Special Issue Editor

Dr. Lucia Rizzuto

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Guest Editor
Dipartimento di Fisica e Chimica – E. Segrè, Università degli Studi di Palermo, Via Archirafi 36, I-90123 Palermo, Italy
Interests: quantum electrodynamics; vacuum fluctuations; casimir effects; causality and non-locality in QED; radiative processes in static and dynamical structured environments; quantum field theory in accelerated frames; unruh effect; cosmological axions and dark matter
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

Vacuum fluctuations of the quantized electromagnetic field are at the origin of many observable phenomena, such as spontaneous emission of radiation by atoms or molecules, van der Waals, Casimir and Casimir–Polder forces between neutral objects, resonant interactions, and resonant energy transfer between atoms/molecules. These effects are present at the micro- and nanoscale and play a fundamental role in a variety of physical, chemical, and biological processes, as well in applications in micro- and nanotechnologies. Recent theoretical studies and advances in experimental techniques and in material science have shown that radiative properties of atoms/molecules can be tailored and controlled through nontrivial environments (such as photonic crystals, waveguide, cavities) or in dynamical situations (for example, dynamical boundary conditions or dynamical environments). 

The main aim of this Special Issue is to give an overview of new theoretical and experimental progresses on radiative processes by atoms or molecules, such as resonant and dispersion van der Waals/Casimir interactions, resonant energy transfer, and collective spontaneous emission, both in static and dynamical situations. Applications to nanotechnologies will be also considered.

Topics will include:

  • Van der Waals and Casimir dispersion interactions (theory and applications);
  • Dynamical Casimir and Casimir–Polder effect;
  • Resonant interactions and resonant energy transfer in structured environment (such as photonic crystals, waveguides, cavities, and nanostructured materials);
  • Collective spontaneous emission of atoms in structured environments;
  • Radiative processes in dynamical structured environments;
  • Casimir effects out of thermal equilibrium;
  • Casimir forces in micro- and nano-electromechanical systems;
  • Dispersion and resonance interactions in biological systems. 
  • Optomechanical systems;
  • Casimir friction;   
  • Casimir torque;
  • Heat transfer.

Dr. Lucia Rizzuto
Guest Editor

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Applied Sciences is an international peer-reviewed open access semimonthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2400 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • vacuum fluctuations
  • static and dynamical Casimir effect
  • Casimir–Polder interactions
  • resonant energy transfer
  • spontaneous emissions
  • photonic crystals
  • micro-electromechanical systems (MEMS)
  • nano-electromechanical systems (NEMS)
  • quantum optomechanics
  • heat transfer

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Published Papers (2 papers)

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Research

13 pages, 1323 KiB  
Article
Controlling Electronic Energy Transfer: A Systematic Framework of Theory
by David L. Andrews and David S. Bradshaw
Appl. Sci. 2022, 12(17), 8597; https://doi.org/10.3390/app12178597 - 27 Aug 2022
Cited by 1 | Viewed by 1525
Abstract
The transport of electronic excitation energy (EET) between ions, atoms, molecules or chromophores is an important process that occurs in a wide range of physical systems. The tantalising prospect of effective experimental control over such transfer is, in principle, amenable to a variety [...] Read more.
The transport of electronic excitation energy (EET) between ions, atoms, molecules or chromophores is an important process that occurs in a wide range of physical systems. The tantalising prospect of effective experimental control over such transfer is, in principle, amenable to a variety of different kinds of approach. Several of the most promising, which are analysed and compared in this paper, involve the influence of externally applied static electric or electromagnetic fields, or the exploitation of local media effects. A quantum electrodynamical framework is used as a common basis to describe the corresponding mechanisms, illustrated by specially adapted Feynman diagrams. It becomes evident that energy transfer between polar species engages an additional pairwise interaction beyond the EET coupling. Such an effect may also play an important role in interatomic Coulombic decay (ICD), a process that has recently attracted fresh interest. The control of ICD, in which the photoionisation of two nearby atoms via energy transfer, is determined to have analogous characteristics to conventional forms of EET. Full article
(This article belongs to the Special Issue Radiative Processes in Quantum Electrodynamics: Theory, Experiments and Applications II)
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19 pages, 1270 KiB  
Article
Spectroscopy of Alkali Atoms in Solid Matrices of Rare Gases: Experimental Results and Theoretical Analysis
by Caterina Braggio, Roberto Calabrese, Giovanni Carugno, Giuseppe Fiscelli, Marco Guarise, Alen Khanbekyan, Antonio Noto, Roberto Passante, Lucia Rizzuto, Giuseppe Ruoso and Luca Tomassetti
Appl. Sci. 2022, 12(13), 6492; https://doi.org/10.3390/app12136492 - 27 Jun 2022
Cited by 5 | Viewed by 1932
Abstract
We present an experimental and theoretical investigation of the spectroscopy of dilute alkali atoms in a solid matrix of inert gases at cryogenic temperatures, specifically Rubidium atoms in a solid Argon or Neon matrix, and related aspects of the interaction energies between the [...] Read more.
We present an experimental and theoretical investigation of the spectroscopy of dilute alkali atoms in a solid matrix of inert gases at cryogenic temperatures, specifically Rubidium atoms in a solid Argon or Neon matrix, and related aspects of the interaction energies between the alkali atoms and the atoms of the solid matrix. The system considered is relevant for matrix isolation spectroscopy, and it is at the basis of a recently proposed detector of cosmological axions, exploiting magnetic-type transitions between Zeeman sublevels of alkali atoms in a magnetic field, tuned to the axion mass, assumed in the meV range. Axions are one of the supposed constituents of the dark matter (DM) of the Universe. This kind of spectroscopy could be also relevant for the experimental search of new physics beyond the Standard Model, in particular the search of violations of time-reversal or parity-charge-conjugation (CP) symmetry. In order to efficiently resolve the axion-induced transition in alkali-doped solid matrices, it is necessary to reduce as much as possible the spectral linewidth of the electronic transitions involved. The theoretical investigation presented in this paper aims to estimate the order of magnitude of the inhomogeneous contribution to the linewidth due to the alkali–matrix interactions (Coulomb/exchange and dispersion), and to compare the theoretical results with our experimental measurements of spectra of dilute Rubidium atoms in Argon and Neon solid matrix. The comparison of the expected or measured spectral linewidths will be important for selecting the most appropriate combination of alkali atoms and matrix inert elements to be used in the proposed axion detection scheme. It is finally suggested that dilute Lithium atoms diffused in a cold parahydrogen solid matrix could be, overall, a good system upon which the proposed detector could be based. Full article
(This article belongs to the Special Issue Radiative Processes in Quantum Electrodynamics: Theory, Experiments and Applications II)
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