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Metasurfaces Meet Two-Dimensional Materials

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

Deadline for manuscript submissions: closed (20 September 2023) | Viewed by 2158

Special Issue Editor

Department of Electronic Engineering, City University of Hong Kong, Kowloon Tong, Hong Kong
Interests: metasurfaces; bound states in the continuum; surface lattice resonances; 2D ma-terials; full Stokes polarization; integrated photonics; plasmonics; functional photonic devices; meta-devices

Special Issue Information

Dear Colleagues,

In the last two decades, metasurfaces and two-dimensional (2D) materials are two exciting fields that have been undergoing independent development. Recently, these fields have started to overlap.

As the planar version of metamaterials, metasurfaces consisting of subwavelength unit cells are known for their exceptional capacities in electromagnetic wave manipulation, such as polarization, amplitude, frequency, wavefront, and angular momenta. Additionally, since the discovery of graphene in 2004, researchers have predicted more than 600 potential 2D materials, offering new platforms for novel optoelectronic applications. Recently, these two research directions have intersected and inspired each other, leading to novel physical phenomena and applications. For example, layered 2D materials/metasurfaces with twisted magic angles have been shown to allow unprecedented control over photonic and electronic band structures. The combination of 2D materials and metasurfaces promises exotic meta-devices with active control, strong light-matter interaction, enhanced nonlinear effects, and entangled quantum emittance.

This Special Issue aims to highlight the latest achievements in metasurfaces and 2D materials, with a special focus on the novel theory, design, and application of 2D material metasurfaces, in an attempt to draw conclusions regarding the development trends in this interdisciplinary field.

You are invited to contribute to this Issue by submitting your original research articles or reviews. The scope of this Issue includes, but is not limited to, work related to nano-tailored 2D materials, metasurfaces, or both.

Dr. Yao Liang
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

  • metasurfaces
  • metamaterials
  • 2D materials
  • Moiré engineering metasurfaces or 2D materials
  • hybrid 2D materials metasurfaces
  • bound states in the continuum (BICs)
  • novel properties of 2D materials and functionalized metasurfaces
  • applications of metasurfaces/2D materials

Published Papers (1 paper)

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Research

17 pages, 3174 KiB  
Article
Bond-Orbital-Resolved Piezoelectricity in Sp2-Hybridized Monolayer Semiconductors
by Zongtan Wang, Yulan Liu and Biao Wang
Materials 2022, 15(21), 7788; https://doi.org/10.3390/ma15217788 - 4 Nov 2022
Viewed by 1278
Abstract
Sp2-hybridized monolayer semiconductors (e.g., planar group III-V and IV-IV binary compounds) with inversion symmetry breaking (ISB) display piezoelectricity governed by their σ- and π-bond electrons. Here, we studied their bond-orbital-resolved electronic piezoelectricity (i.e., the σ- and π-piezoelectricity). We formulated a tight-binding [...] Read more.
Sp2-hybridized monolayer semiconductors (e.g., planar group III-V and IV-IV binary compounds) with inversion symmetry breaking (ISB) display piezoelectricity governed by their σ- and π-bond electrons. Here, we studied their bond-orbital-resolved electronic piezoelectricity (i.e., the σ- and π-piezoelectricity). We formulated a tight-binding piezoelectric model to reveal the different variations of σ- and π-piezoelectricity with the ISB strength (Δ). As Δ varied from positive to negative, the former decreased continuously, but the latter increased piecewise and jumped at Δ=0 due to the criticality of the π-electrons’ ground-state geometry near this quantum phase-transition point. This led to a piezoelectricity predominated by the π-electrons for a small |Δ|. By constructing an analytical model, we clarified the microscopic mechanisms underlying the anomalous π-piezoelectricity and its subtle relations with the valley Hall effect. The validation of our models was justified by applying them to the typical sp2 monolayers including hexagonal silicon carbide, Boron-X (X = N, P, As, Ab), and a BN-doped graphene superlattice. Full article
(This article belongs to the Special Issue Metasurfaces Meet Two-Dimensional Materials)
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