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Applied Sciences
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Optical Properties of Confined Quantum Systems
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Optical Properties of Confined Quantum Systems

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

Deadline for manuscript submissions: closed (31 August 2019) | Viewed by 11622

Special Issue Editor

Dr. Serghei Klimin

E-Mail Website
Guest Editor
TQC, Universiteit Antwerpen, Universiteitsplein 1, B-2610 Antwerp, Belgium
Interests: condensed matter physics; quantum gases; polaron theory
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

Confined quantum systems embrace a wide variety of subjects, ranging from nanostructures—particularly quantum dots, quantum wires, and planar nanostructures including graphene-based systems—to quantum systems of microscopic scale, such as quantum atomic gases.

Advances in the science of quantum nanostructures over the course of more than twenty years are remarkable. As a result, confined nanoscale quantum systems already have an outstanding spectrum of applications in various important areas. More recently, studies of quantum phenomena in ultracold atomic gases have seen steadily growing progress and increasing interest, nontrivially involving subjects specific to many other research areas (e.g., polaron physics). Consequently, the optical properties of confined quantum systems represent a great experimental and theoretical interest for their characterization and getting a picture of intrinsic quantum states and collective excitations, which can have significance for potential practical realizations, including even such a fascinating perspective as quantum computing, which is still expecting a breakthrough.

The main goal of this Special Issue is to bring together experimental and theoretical studies on the dynamic response of various classes of confined quantum systems and to encourage an interchange of ideas between specialists in different topics of this comprehensive scientific area. The scope of the Issue includes review papers and new original experimental and theoretical results.

Dr. Serghei Klimin
Guest Editor

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Keywords

  • Optical response
  • Quantum dots
  • Nanostructures
  • Quantum gases

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Published Papers (3 papers)

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Research

11 pages, 1215 KiB  
Article
Resonant Terahertz Light Absorption by Virtue of Tunable Hybrid Interface Phonon–Plasmon Modes in Semiconductor Nanoshells
by Denis L. Nika, Evghenii P. Pokatilov, Vladimir M. Fomin, Josef T. Devreese and Jacques Tempere
Appl. Sci. 2019, 9(7), 1442; https://doi.org/10.3390/app9071442 - 6 Apr 2019
Cited by 4 | Viewed by 2749
Abstract
Metallic nanoshells have proven to be particularly versatile, with applications in biomedical imaging and surface-enhanced Raman spectroscopy. Here, we theoretically demonstrate that hybrid phonon-plasmon modes in semiconductor nanoshells offer similar advantages in the terahertz regime. We show that, depending on tm,n,nhe doping of [...] Read more.
Metallic nanoshells have proven to be particularly versatile, with applications in biomedical imaging and surface-enhanced Raman spectroscopy. Here, we theoretically demonstrate that hybrid phonon-plasmon modes in semiconductor nanoshells offer similar advantages in the terahertz regime. We show that, depending on tm,n,nhe doping of the semiconductor shells, terahertz light absorption in these nanostructures can be resonantly enhanced due to the strong coupling between interface plasmons and phonons. A threefold to fourfold increase in the absorption peak intensity was achieved at specific values of electron concentration. Doping, as well as adapting the nanoshell radius, allowed for fine-tuning of the absorption peak frequencies. Full article
(This article belongs to the Special Issue Optical Properties of Confined Quantum Systems)
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7 pages, 241 KiB  
Article
Self-Consistent Derivation of the Modified Gross–Pitaevskii Equation with Lee–Huang–Yang Correction
by Luca Salasnich
Appl. Sci. 2018, 8(10), 1998; https://doi.org/10.3390/app8101998 - 21 Oct 2018
Cited by 12 | Viewed by 3858
Abstract
We consider a dilute and ultracold bosonic gas of weakly-interacting atoms. Within the framework of quantum field theory, we derive a zero-temperature modified Gross–Pitaevskii equation with beyond-mean-field corrections due to quantum depletion and anomalous density. This result is obtained from the stationary equation [...] Read more.
We consider a dilute and ultracold bosonic gas of weakly-interacting atoms. Within the framework of quantum field theory, we derive a zero-temperature modified Gross–Pitaevskii equation with beyond-mean-field corrections due to quantum depletion and anomalous density. This result is obtained from the stationary equation of the Bose–Einstein order parameter coupled to the Bogoliubov–de Gennes equations of the out-of-condensate field operator. We show that, in the presence of a generic external trapping potential, the key steps to get the modified Gross–Pitaevskii equation are the semiclassical approximation for the Bogoliubov–de Gennes equations, a slowly-varying order parameter and a small quantum depletion. In the uniform case, from the modified Gross–Pitaevskii equation, we get the familiar equation of state with Lee–Huang–Yang correction. Full article
(This article belongs to the Special Issue Optical Properties of Confined Quantum Systems)
21 pages, 1104 KiB  
Article
Gaussian Quantum Trajectories for the Variational Simulation of Open Quantum-Optical Systems
by Wouter Verstraelen and Michiel Wouters
Appl. Sci. 2018, 8(9), 1427; https://doi.org/10.3390/app8091427 - 21 Aug 2018
Cited by 21 | Viewed by 4367
Abstract
We construct a class of variational methods for the study of open quantum systems based on Gaussian ansatzes for the quantum trajectory formalism. Gaussianity in the conjugate position and momentum quadratures is distinguished from Gaussianity in density and phase. We apply these methods [...] Read more.
We construct a class of variational methods for the study of open quantum systems based on Gaussian ansatzes for the quantum trajectory formalism. Gaussianity in the conjugate position and momentum quadratures is distinguished from Gaussianity in density and phase. We apply these methods to a driven-dissipative Kerr cavity where we study dephasing and the stationary states throughout the bistability regime. Computational cost proves to be similar to the Truncated Wigner Approximation (TWA) method, with at most quadratic scaling in system size. Meanwhile, strong correspondence with the numerically-exact trajectory description is maintained so that these methods contain more information on the ensemble constitution than TWA and can be more robust. Full article
(This article belongs to the Special Issue Optical Properties of Confined Quantum Systems)
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