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Low-Dimensional Materials for Quantum Science and Technology

A special issue of Materials (ISSN 1996-1944). This special issue belongs to the section "Quantum Materials".

Deadline for manuscript submissions: closed (20 January 2024) | Viewed by 4012

Special Issue Editor


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Guest Editor
Dipartimento di Fisica “Ettore Pancini”, Università degli Studi di Napoli “Federico II”, Napoli, Italy
Interests: Raman spectroscopy; photoluminescence spectroscopy; ultrafast spectroscopy; 2D materials; confocal microscopy; near-field optical microscopy; ultrafast electron and phonon dynamics; excitons; polaritons
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Special Issue Information

Dear Colleagues,

Low-dimensional materials such as zero-dimensional (0D) quantum dots and (1D) one-dimensional carbon nanotubes show an electronic wavefunction confined in one or more of their three dimensions. These spatial constraints lead to quantum size effects which strongly modify their electronic and optical properties with respect to their bulk counterparts.

Relevant examples of low-dimensional systems are two-dimensional (2D) materials such as graphene, transition metal dichalcogenides, and hexagonal boron nitride. These systems offer strong light–matter interactions, many-body effects, tunable band gaps, and novel excitonic effects at room temperature. Moreover, they are the building blocks from which are formed tailored van der Waals heterostructures, with control at the monolayer level. This offers unprecedented opportunities for engineering their bandgap for fundamental science and applications.

In recent years, quantum emitters with tailorable electronic band structure were found in various 2D materials, offering the prospect of their deterministic position control and integration into complex electronic and photonic devices. These 2D materials can be used as on-chip active elements to build new types of quantum sensors and detectors. For these reasons, these materials have become a key platform for applications in quantum technologies.

This Special Issue in envisioned as a forum for the discussion of the latest findings in the quantum optical and electronic properties of low-dimensional materials and of their applications in quantum technologies. Full research papers, short communications, and reviews are welcomed.

Dr. Felice Gesuele
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. Materials 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 2600 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

  • quantum dots
  • carbon nanotubes
  • 2D materials
  • van der waals heterostructures
  • excitons
  • charge and energy transfer
  • bandgap engineering
  • spin–valley coupling
  • polaritons
  • single-photon sources
  • quantum sensors
  • quantum detectors

Published Papers (2 papers)

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Research

12 pages, 625 KiB  
Article
Distribution of Electron Density in Self-Assembled One-Dimensional Chains of Si Atoms
by Mieczysław Jałochowski and Tomasz Kwapiński
Materials 2023, 16(17), 6044; https://doi.org/10.3390/ma16176044 - 2 Sep 2023
Viewed by 1046
Abstract
Scanning tunneling microscopy measurements of height profiles, along the chains of Si atoms on the terrace edges of a perfectly ordered Si(553)-Au surface, reveal an STM bias-dependent mixed periodicity with periods of one, two and one and a half lattice constants. The simple [...] Read more.
Scanning tunneling microscopy measurements of height profiles, along the chains of Si atoms on the terrace edges of a perfectly ordered Si(553)-Au surface, reveal an STM bias-dependent mixed periodicity with periods of one, two and one and a half lattice constants. The simple linear chain model usually observed with STM cannot explain the unexpected fractional periodicity in the height profile. It was found that the edge Si chain stands for, in fact, a zigzag structure, which is composed of two neighboring rows of Si atoms and was detected in the STM experiments. Tight-binding calculations of the local density of states and charge occupancy along the chain explain the voltage-dependent modulations of the STM profiles and show that oscillation periods are determined mainly by the surface and STM tip Fermi energies. Full article
(This article belongs to the Special Issue Low-Dimensional Materials for Quantum Science and Technology)
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15 pages, 2347 KiB  
Article
Quantum Oscillations of the Energy Loss Rate of Hot Electrons in Graphene at Strong Magnetic Fields
by Margarita Tsaousidou and Shrishail S. Kubakaddi
Materials 2023, 16(6), 2274; https://doi.org/10.3390/ma16062274 - 12 Mar 2023
Viewed by 2520
Abstract
We present a theoretical model for the calculation of the energy loss rate (ELR) of hot electrons in a monolayer graphene due to their coupling with acoustic phonons at high perpendicular magnetic fields. Electrons interact with both transverse acoustic (TA) and longitudinal acoustic [...] Read more.
We present a theoretical model for the calculation of the energy loss rate (ELR) of hot electrons in a monolayer graphene due to their coupling with acoustic phonons at high perpendicular magnetic fields. Electrons interact with both transverse acoustic (TA) and longitudinal acoustic (LA) phonons. Numerical simulations of the ELR are performed as a function of the magnetic field, the electron temperature, the electron density, and the Landau level broadening. We find robust oscillations of the ELR as a function of the filling factor ν that originate from the oscillating density of states at the Fermi level. Screening effects on the deformation potential coupling are taken into account, and it is found that they lead to a significant reduction of ELR, especially, at low electron temperatures, Te, and high magnetic fields. At temperatures much lower than the Bloch–Grüneisen temperature, the ELR shows a Te4 dependence that is related to the unscreened electron interaction with TA acoustic phonons. Finally, our theoretical model is compared with existing experimental results and a very good quantitative agreement is found. Full article
(This article belongs to the Special Issue Low-Dimensional Materials for Quantum Science and Technology)
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