Communications in Physics <p><em>Communications in Physics </em>is a peer reviewed journal<em>, </em>published by the Vietnam Academy of Science and Technology. </p> <p>The journal <em>has </em>ISSN 0886-3166 (print), ISSN 2815-5947 (online) and website: <a href=""></a>.</p> <p><em>Communications in Physics </em>is published quarterly, 4 issues per year, in March, June, September, and December. The journal publications have DOI. </p> <p>The object of <em>Communications in Physics</em> is the publication of high-quality articles on fundamental, applied and interdisciplinary physics. Moreover, topical reviews are also welcome upon an invitation from the editorial board. </p> <p>The members of the editorial board are recognized experts in the fields, covered by the journal, and clearly identified in the journal’s website. All editorial decisions are made by a team of professional editors.</p> <p>The journal has the policies on publishing ethics. The journal’s website clearly provides its publication ethics, process for identification of and dealing with allegation of research misconduct, and copyright and licensing information…</p> <p>All manuscripts are submitted online via the online system:</p> <p>There are no author submission fees or other publication-related charges.</p> <ul> <li><a title="Aims and Scope" href="">Aims and Scope</a></li> <li><a title="Editorial Board" href="">Editorial Board</a></li> <li><a title="Peer Review Process" href="">Peer Review Process</a></li> <li><a title="Open Access Policy" href="">Open Access Policy</a></li> <li><a title="Copyright &amp; Licensing" href="">Copyright &amp; Licensing</a></li> <li><a title="Plagiarism Detection" href="">Plagiarism Detection</a></li> <li><a title="Article Processing Charge" href="">Article Processing Charge</a></li> <!-- <li><a title="Journal History" href="">Journal History</a></li> --> <li><a title="Sponsors" href="">Sponsors</a></li> </ul> en-US Authors who publish with CIP agree with the following terms: <br /><ol><li>The manuscript is not under consideration for publication elsewhere. When a manuscript is accepted for publication, the author agrees to automatic transfer of the copyright to the editorial office.</li><li>The manuscript should not be published elsewhere in any language without the consent of the copyright holders. Authors have the right to enter into separate, additional contractual arrangements for the non-exclusive distribution of the journal’s published version of their work (e.g., post it to an institutional repository or publish it in a book), with an acknowledgement of its initial publication in this journal.</li><li>Authors are encouraged to post their work online (e.g., in institutional repositories or on their websites) prior to or during the submission process, as it can lead to productive exchanges or/and greater number of citation to the to-be-published work (See The Effect of Open Access).</li></ol> (Nguyen Xuan Giao) (Nguyen Xuan Giao) Sat, 18 May 2024 14:56:10 +0700 OJS 60 Structural prediction of carbon cluster isomers with machine-learning potential <p>Structural prediction of low-energy isomers of carbon twelve-atom clusters is carried out using the recently developed machine-learning potential GAP-20. The GAP-20 agrees with density-functional theory calculations regarding geometric structures and average C-C bond lengths for most isomers. However, the GAP-20 substantially lowers the energies of cage-like structures, resulting in a wrong ground state. A comparison of the cohesive energies with the density-functional theory points out that the GAP-20 only gives good results for monocyclic rings. Two multicyclic rings appear as new low-energy isomers, which have yet to be discovered in previous research.</p> Duy Huy Nguyen Copyright (c) 2024 Communications in Physics Tue, 11 Jun 2024 00:00:00 +0700 Hybridization of an s-wave impurity with graphene lattice <p>Hybridization function is a quantity characterizing electron hoppings between an impurity and a host material in which the impurity resides, a full understandinging of it is crucial for studying correlation effects in various impurity problems. This work studies the hybridization function for the Anderson impurity model describing a single-orbital impurity on a honeycomb lattice simulating graphene and presents a calculation approach to obtain this function at low energy. Within this approach, the general form of the hybridization function in graphene is presented and analytical expressions of low-energy hybridization spectrum are obtained. The results quantitatively match numerical solutions for different impurity positions on the lattice. The effect of the low-energy hybridization spectrum and the capability to predict the correlated effects of the impurity problem are discussed thoroughly, suggesting that different types of pseudogap Kondo effect may occur at different impurity positions.</p> Hoa T. M. Nghiem, Tien-Lam Pham, Ngoc-Linh Nguyen, Hung T. Dang Copyright (c) 2024 Communications in Physics Tue, 11 Jun 2024 00:00:00 +0700 Dirac CP violation phase in the neutrino sector with A4 flavour symmetry <p>CP violation is one of the problems of the physics beyond the Standard Model. It can happen in both the quark and the lepton sectors. In the present paper, following the work arXiv:1602.07437 [hep-ph], this problem is re-considered in the lepton sector (neutrino subsector) within an extended Standard Model with an $A_4$ flavour discrete symmetry with a new and more convenient parametrization. As a result, a perturbative mixing matrix is derived. Then, the Dirac CP violation phase \(\delta_{CP}\equiv \delta\) and the Jarlskog invariant \(J_{CP}\equiv J\) are analytically obtained from theoretically derived equations leading to the solutions \(\delta= \pm {1\over 2}\pi\) . Between the two solutions, the solution \(\delta=-{1\over 2}\pi\) (i.e., \({3\over 2}\pi\)) is more preferable as it is more consistent with the experimental data for the inverted ordering of the neutrino masses for the gobal fit [PDG] or the normal ordering [T2K, NO\(\nu\)A]). A relation between $\delta$ and $J$ is also given in terms of new parameters. The maximum value of Jarlskog invariant \(|J^{max}|\) is found in the range $0.0237 &lt; |J^{max}| &lt; 0.034$, covering the 2022-2023 global fit values [PDG]: \(|J_{PDG}^{max}|= 0.0336\pm 0.0006 ~(\pm 0.0019)\) at \(1\sigma ~(3\sigma\)). Other values of J can be determined by the ralation \(J (\delta)\) and approximated by Fig. 2. between two solutions.</p> Phi Quang Van, Nguyen Anh Ky, Tien Manh Tran Copyright (c) 2024 Communications in Physics Tue, 11 Jun 2024 00:00:00 +0700