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<!DOCTYPE article PUBLIC "-//NLM//DTD JATS (Z39.96) Journal Archiving and Interchange DTD with OASIS Tables with MathML3 v1.4 20241031//EN" "https://jats.nlm.nih.gov/archiving/1.4/JATS-archive-oasis-article1-4-mathml3.dtd">
<article xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:ali="http://www.niso.org/schemas/ali/1.0/" dtd-version="1.4" article-type="research-article" xml:lang="en"><front><journal-meta><journal-title-group><journal-title xml:lang="ru">Математическая физика и компьютерное моделирование</journal-title></journal-title-group><issn publication-format="print">2587-6325</issn><issn publication-format="electronic">2587-6902</issn></journal-meta><article-meta><article-id pub-id-type="doi">10.15688/mpcm.jvolsu.2025.2.7</article-id><article-categories><subj-group><subject>Other</subject></subj-group></article-categories><title-group><article-title xml:lang="ru">ОСОБЕННОСТИ ТОКА СМЕЩЕНИЯ ФЛУКСОНА В НЕУПОРЯДОЧЕННОМ S-I-S-ТУННЕЛЬНОМ КОНТАКТЕ</article-title><trans-title-group xml:lang="en"><trans-title>PECULIARITIES OF FLUXON SHIFT CURRENT IN A DISORDERED S-I-S-TUNNEL JUNCTION</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author"><name-alternatives><name xml:lang="ru"><surname>Лозин</surname><given-names>Олег Игоревич</given-names></name><name xml:lang="en"><surname>Lozin</surname><given-names>Oleg</given-names></name></name-alternatives><xref ref-type="aff" rid="aff1"/><email>oleg.lozin@mail.ru</email><contrib-id contrib-id-type="orcid">0000-0003-0740-6479</contrib-id></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="ru"><surname>Вяткина</surname><given-names>Ирина Александровна</given-names></name><name xml:lang="en"><surname>Vyatkina</surname><given-names>Irina</given-names></name></name-alternatives><xref ref-type="aff" rid="aff1"/><email>irinka.vyatkina@mail.ru</email><contrib-id contrib-id-type="orcid">0000-0001-8956-570X</contrib-id></contrib><aff-alternatives id="aff1"><aff xml:lang="en"><institution>Platov South-Russian State Polytechnic University (NPI)</institution></aff><aff xml:lang="ru"><institution>Южно-Российский государственный политехнический университет (НПИ) им. М.И. Платова</institution></aff></aff-alternatives></contrib-group><pub-date pub-type="epub" iso-8601-date="2025-08-07"><day>07</day><month>08</month><year>2025</year></pub-date><volume>28</volume><issue>2</issue><fpage>81</fpage><lpage>95</lpage><history><date date-type="received" iso-8601-date="2025-03-03"><day>03</day><month>03</month><year>2025</year></date><date date-type="accepted" iso-8601-date="2025-04-16"><day>16</day><month>04</month><year>2025</year></date></history><permissions><license xlink:href="https://creativecommons.org/licenses/by/4.0/" xlink:title="CC BY 4.0"><ali:license_ref>https://creativecommons.org/licenses/by/4.0/</ali:license_ref><license-p xml:lang="ru">CC BY 4.0</license-p></license></permissions><self-uri xlink:href="https://mp.jvolsu.com/index.php/ru/archive-ru/513-mathematical-physics-and-computer-simulation-2025-vol-28-no-2/fizika-i-astronomiya/1152-lozin-o-i-vyatkina-i-a-osobennosti-toka-smeshcheniya-fluksona-v-neuporyadochennom-s-i-s-tunnelnom-kontakte" xlink:title="https://mp.jvolsu.com/index.php/ru/archive-ru/513-mathematical-physics-and-computer-simulation-2025-vol-28-no-2/fizika-i-astronomiya/1152-lozin-o-i-vyatkina-i-a-osobennosti-toka-smeshcheniya-fluksona-v-neuporyadochennom-s-i-s-tunnelnom-kontakte">https://mp.jvolsu.com/index.php/ru/archive-ru/513-mathematical-physics-and-computer-simulation-2025-vol-28-no-2/fizika-i-astronomiya/1152-lozin-o-i-vyatkina-i-a-osobennosti-toka-smeshcheniya-fluksona-v-neuporyadochennom-s-i-s-tunnelnom-kontakte</self-uri><abstract xml:lang="ru"><p>Проведено численно-аналитическое исследование поведения тока смещения джозефсоновского вихря (флуксона) в длинном S-I-S (S – сверхпроводник, I – изолятор) туннельном контакте со слабым (малые концентрации примеси) структурным беспорядком в I-слое. Показано, что в пространстве параметров (δ, c), где параметр δ равен отклонению уровня Ферми контакта от энергии квазилокального электронного состояния на примеси в I-слое, а c – безразмерная концентрация примеси, зависимость тока смещения от δ при разных 𝑐 имеет качественно разный вид.</p></abstract><abstract xml:lang="en" abstract-type="summary"><p>When a Josephson vortex (fluxon) moves in a tunnel S-IS (S – superconductor, I – insulator) contact, in the I-layer of which there are random inhomogeneities, the radiation friction of the vortex against these inhomogeneities leads to a slowdown in its movement. To control the speed of the fluxon, a current can be introduced into the contact – the so-called fluxon shift current. In the article, the behavior of the fluxon shift current in a long S-I-S-tunnel junction with weak (low impurity concentrations) structural disorder in the I-layer is studied using a numerical-analytical method. Quantum resonant percolation trajectories (QRPTs), also called Lifshitz-Kirpichenkov trajectories, which are randomly formed in the I-layer containing impurity atoms, are considered as an inhomogeneity that influences the vortex dynamics. The fluxon shift current was considered in the parameter space (δ, c), where δ = µ − ε0 is the deviation of the Fermi level of the junction from the local single-electron impurity level. It is shown that there are physically significant concentration values at which the dependence of the shift current on δ has features (additional maxima) caused by the contributions of the QRPTs passing through different numbers of impurities. Not only quantitative but also qualitative (appearance and disappearance of features) changes in the dependence of the fluxon shift current on δ were also revealed. The results obtained can be useful in interpreting experimental data, as well as in creating technical devices based on disordered S-I-S-contacts.</p></abstract><kwd-group xml:lang="ru"><kwd>неупорядоченный туннельный контакт</kwd><kwd>джозефсоновский вихрь</kwd><kwd>квантовые резонансно-перколяционные траектории</kwd><kwd>динамика флуксона</kwd><kwd>численно-аналитический метод</kwd></kwd-group><kwd-group xml:lang="en"><kwd>parallel computing</kwd><kwd>gravitational systems</kwd><kwd>OpenMP</kwd><kwd>processor architecture</kwd><kwd>Hyper-Threading technology</kwd></kwd-group></article-meta></front><back><ref-list><ref id="ref1"><mixed-citation publication-type="other" xml:lang="ru">Абрикосов, А. А. Введение в теорию металлов / А. А. Абрикосов. — М. : ФИЗМАТЛИТ, 2009. — 600 c.</mixed-citation></ref><ref id="ref2"><mixed-citation publication-type="other" xml:lang="ru">Бароне, А. Эффект Джозефсона: Физика и применения / А. Бароне, Дж. 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