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<article xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:ali="http://www.niso.org/schemas/ali/1.0/" article-type="research-article" dtd-version="1.2" xml:lang="en"><front><journal-meta><journal-id journal-id-type="publisher-id">Discrete and Continuous Models and Applied Computational Science</journal-id><journal-title-group><journal-title xml:lang="en">Discrete and Continuous Models and Applied Computational Science</journal-title><trans-title-group xml:lang="ru"><trans-title>Discrete and Continuous Models and Applied Computational Science</trans-title></trans-title-group></journal-title-group><issn publication-format="print">2658-4670</issn><issn publication-format="electronic">2658-7149</issn><publisher><publisher-name xml:lang="en">Peoples' Friendship University of Russia named after Patrice Lumumba (RUDN University)</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="publisher-id">43672</article-id><article-id pub-id-type="doi">10.22363/2658-4670-2024-32-4-445-451</article-id><article-id pub-id-type="edn">DFMUXX</article-id><article-categories><subj-group subj-group-type="toc-heading" xml:lang="en"><subject>Physics and Astronomy</subject></subj-group><subj-group subj-group-type="toc-heading" xml:lang="ru"><subject>Физика</subject></subj-group><subj-group subj-group-type="article-type"><subject>Research Article</subject></subj-group></article-categories><title-group><article-title xml:lang="en">Superconductivity and special symmetry of twisted tri-layer graphene in chiral model</article-title><trans-title-group xml:lang="ru"><trans-title>Сверхпроводимость и особая симметрия скрученного трехслойного графена в киральной модели</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0002-7744-9725</contrib-id><contrib-id contrib-id-type="scopus">16454766600</contrib-id><contrib-id contrib-id-type="researcherid">S-4813-2018</contrib-id><name-alternatives><name xml:lang="en"><surname>Rybakov</surname><given-names>Yuri P.</given-names></name><name xml:lang="ru"><surname>Рыбаков</surname><given-names>Ю. П.</given-names></name></name-alternatives><bio xml:lang="en"><p>Professor, Doctor of Sciences in Physics and Mathematics, Professor at the Institute of Physical Research and Technologies</p></bio><email>rybakov-yup@rudn.ru</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Umar</surname><given-names>Medina</given-names></name><name xml:lang="ru"><surname>Умар</surname><given-names>М.</given-names></name></name-alternatives><bio xml:lang="en">Exchange student of the Institute of Physical Research and Technologies</bio><email>mails4medina@gmail.com</email><xref ref-type="aff" rid="aff1"/></contrib></contrib-group><aff-alternatives id="aff1"><aff><institution xml:lang="en">RUDN University</institution></aff><aff><institution xml:lang="ru">Российский университет дружбы народов</institution></aff></aff-alternatives><pub-date date-type="pub" iso-8601-date="2024-12-15" publication-format="electronic"><day>15</day><month>12</month><year>2024</year></pub-date><volume>32</volume><issue>4</issue><issue-title xml:lang="en">VOL 32, NO4 (2024)</issue-title><issue-title xml:lang="ru">ТОМ 32, №4 (2024)</issue-title><fpage>445</fpage><lpage>451</lpage><history><date date-type="received" iso-8601-date="2025-04-05"><day>05</day><month>04</month><year>2025</year></date></history><permissions><copyright-statement xml:lang="en">Copyright ©; 2024, Rybakov Y.P., Umar M.</copyright-statement><copyright-statement xml:lang="ru">Copyright ©; 2024, Рыбаков Ю.П., Умар М.</copyright-statement><copyright-year>2024</copyright-year><copyright-holder xml:lang="en">Rybakov Y.P., Umar M.</copyright-holder><copyright-holder xml:lang="ru">Рыбаков Ю.П., Умар М.</copyright-holder><ali:free_to_read xmlns:ali="http://www.niso.org/schemas/ali/1.0/"/><license><ali:license_ref xmlns:ali="http://www.niso.org/schemas/ali/1.0/">https://creativecommons.org/licenses/by-nc/4.0</ali:license_ref></license></permissions><self-uri xlink:href="https://journals.rudn.ru/miph/article/view/43672">https://journals.rudn.ru/miph/article/view/43672</self-uri><abstract xml:lang="en"><p>Superconducting properties of twisted tri-layer graphene (TTG) are studied within the scope of the chiral model based on using the unitary matrix <span class="math inline">\(U \in SU(2)\)</span> as an order parameter. To check the superconductor behavior of this system, the interaction with the external magnetic field <span class="math inline">\(B_0\)</span> oriented along the graphene sheets is switched on and the internal magnetic intensity in the center is calculated as the function of the twisting angle. Vanishing of this function, due to the Meissner effect, being the important feature of the superconductivity, the corresponding dependence of the magic twisting angle on <span class="math inline">\(B_0\)</span> is calculated. The unusual effect of re-entrant superconductivity for large values of <span class="math inline">\(B_0\)</span> is discussed.</p></abstract><trans-abstract xml:lang="ru"><p>Сверхпроводящие свойства скрученного трёхслойного графена изучаются в рамках киральной модели, основанной на использовании унитарной матрицы <span class="math inline">\(U \in SU(2)\)</span> в качестве параметра порядка. Для проверки сверхпроводящего поведения этой системы включается взаимодействие с внешним магнитным полем <span class="math inline">\(B_0\)</span>, ориентированным вдоль листа графена, и вычисляется внутренняя магнитная напряжённость в центре как функция угла закручивания. Обращение этой функции в нуль, вследствие эффекта Мейсснера, являющегося важной особенностью сверхпроводимости, вычисляется соответствующая зависимость магического угла закручивания от <span class="math inline">\(B_0\)</span>. Обсуждается необычный эффект возвратной сверхпроводимости при больших значениях <span class="math inline">\(B_0\)</span>.</p></trans-abstract><kwd-group xml:lang="en"><kwd>tri-layer graphene</kwd><kwd>chiral model</kwd><kwd>superconductivity</kwd></kwd-group><kwd-group xml:lang="ru"><kwd>трёхслойный графен</kwd><kwd>киральная модель</kwd><kwd>сверхпроводимость</kwd></kwd-group><funding-group/></article-meta></front><body></body><back><ref-list><ref id="B1"><label>1.</label><mixed-citation>Novoselov, K. S. et al. Electric field effect in atomically thin carbon films. Science 306, 666-669 (2004).</mixed-citation></ref><ref id="B2"><label>2.</label><mixed-citation>Geim, A. K. Graphine: status and prospects. Science 324, 1530-1534 (2009).</mixed-citation></ref><ref id="B3"><label>3.</label><mixed-citation>Lee, C. et al. Measurement of elastic properties and intrinsic strength of monolayer graphene. 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