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<article article-type="research-article" dtd-version="1.3" 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" xml:lang="en"><front><journal-meta><journal-id journal-id-type="publisher-id">najo</journal-id><journal-title-group><journal-title xml:lang="en">Nanosystems: Physics, Chemistry, Mathematics</journal-title><trans-title-group xml:lang="ru"><trans-title>Наносистемы: физика, химия, математика</trans-title></trans-title-group></journal-title-group><issn pub-type="ppub">2220-8054</issn><issn pub-type="epub">2305-7971</issn><publisher><publisher-name>Университет ИТМО</publisher-name></publisher></journal-meta><article-meta><article-id custom-type="elpub" pub-id-type="custom">najo-1273</article-id><article-categories><subj-group subj-group-type="heading"><subject>Research Article</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="en"><subject>PHYSICS</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="ru"><subject>ФИЗИКА</subject></subj-group></article-categories><title-group><article-title>“Superradiant” phase transition in the presence of optical collisions</article-title><trans-title-group xml:lang="ru"><trans-title>«Сверхизлучательный» фазовый переход в условиях оптических столкновений</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Честнов</surname><given-names>И. Ю.</given-names></name><name name-style="western" xml:lang="en"><surname>Chestnov</surname><given-names>I. Yu.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Честнов Игорь Юрьевич, аспирант кафедры Физики и прикладной математики,</p><p>г. Владимир.</p></bio><bio xml:lang="en"><p>Chestnov Igor Yu., PhD Student,</p><p>Vladimir.</p></bio><email xlink:type="simple">igor_chestnov@mail.ru</email><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Алоджанц</surname><given-names>А. П.</given-names></name><name name-style="western" xml:lang="en"><surname>Alodjants</surname><given-names>A. P.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Алоджанц Александр Павлович, доктор ф.-м. наук, доцент, профессор кафедры Физики и прикладной математики,</p><p>г. Владимир.</p></bio><bio xml:lang="en"><p>Alodjants Alexander P., Doctor of Science, Associate Professor, Professor,</p><p>Vladimir.</p></bio><email xlink:type="simple">alexander_ap@list.ru</email><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Аракелян</surname><given-names>С. М.</given-names></name><name name-style="western" xml:lang="en"><surname>Arakelian</surname><given-names>S. M.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Аракелян Сергей Мартиросович, доктор ф.-м. наук, профессор, профессор кафедры Физики и прикладной математики,</p><p>г. Владимир.</p></bio><bio xml:lang="en"><p>Arakelian Sergei M., Doctor of Science, Professor, Professor, </p><p>Vladimir.</p></bio><email xlink:type="simple">arak@vlsu.ru</email><xref ref-type="aff" rid="aff-1"/></contrib></contrib-group><aff-alternatives id="aff-1"><aff xml:lang="ru"><institution>Владимирский государственный университет имени А. Г. и Н. Г. Столетовых</institution></aff><aff xml:lang="en"><institution>Vladimir State University named after A. G. and N. G. Stoletovs</institution></aff></aff-alternatives><pub-date pub-type="collection"><year>2012</year></pub-date><pub-date pub-type="epub"><day>20</day><month>08</month><year>2025</year></pub-date><volume>3</volume><issue>2</issue><fpage>73</fpage><lpage>84</lpage><permissions><copyright-statement>Copyright &amp;#x00A9; Chestnov I.Y., Alodjants A.P., Arakelian S.M., 2025</copyright-statement><copyright-year>2025</copyright-year><copyright-holder xml:lang="ru">Честнов И.Ю., Алоджанц А.П., Аракелян С.М.</copyright-holder><copyright-holder xml:lang="en">Chestnov I.Y., Alodjants A.P., Arakelian S.M.</copyright-holder><license xml:lang="ru" license-type="creative-commons-attribution" xlink:href="https://creativecommons.org/licenses/by/4.0/" xlink:type="simple"><license-p>Данная работа распространяется под лицензией Creative Commons Attribution 4.0.</license-p></license><license xml:lang="en" license-type="creative-commons-attribution" xlink:href="https://creativecommons.org/licenses/by/4.0/" xlink:type="simple"><license-p>This work is licensed under a Creative Commons Attribution 4.0 License.</license-p></license></permissions><self-uri xlink:href="https://nanojournal.ifmo.ru/jour/article/view/1273">https://nanojournal.ifmo.ru/jour/article/view/1273</self-uri><abstract><p>A problem of high-temperature phase transitions for coupled (dressed) atom-light states and polaritons is considered. An achievement of thermodynamically equilibrium phase for such a states is possible under interaction between rubidium atoms and quantum irradiation in the presence of optical collisions (OCs) with ultra-high pressure buffer gas particles being under high temperatures (up to 530 K). Special metallic  micro-waveguides permitting  photon trapping are proposed for purpose of the enhancement of atom-field interaction. A photonic phase transition to the superradiant state, determined by the equilibrium state of coupled system, was theoretically predicted. It have been  shown that under large negative atom-light detunings and certain waveguide parameters photon-like low branch (LB) polaritons undergo high-temperature phase transition to  condensate (superfluid) state.</p></abstract><trans-abstract xml:lang="ru"><p>Рассмотрена проблема высокотемпературных фазовых переходов для связанных атомно-оптических (одетых) состояний и поляритонов. На примере атомов рубидия показано, что достижение термодинамического равновесия для таких состояний оказывается возможным при взаимодействии атомов с не резонансным квантовым излучением в присутствии оптических столкновений (ОС) с атомами буферного газа сверхвысокого давления, а также находящихся при высоких температурах (до 530К). Для увеличения эффективности атомно-оптического взаимодействия рассмотрены специальные металлические микроволноводы, осуществляющие удержание (trapping) фотонов. В этом случае теоретически предсказан фотонный фазовый переход в сверхизлучательное состояние, обусловленный равновесным состоянием среды и поля. Показано, что при относительно больших отрицательных значениях атомно-оптической отстройки, а также при определенных параметрах волновода фотоноподобные поляритоны нижней дисперсионной ветви (НДВ) претерпевают высокотемпературный фазовый переход в конденсированное (сверхтекучее) состояние.</p></trans-abstract><kwd-group xml:lang="ru"><kwd>оптические столкновения</kwd><kwd>фазовые переходы</kwd><kwd>одетые состояния</kwd><kwd>поляритоны</kwd></kwd-group><kwd-group xml:lang="en"><kwd>optical collisions</kwd><kwd>phase transitions</kwd><kwd>dressed states</kwd><kwd>polaritons</kwd></kwd-group><funding-group><funding-statement xml:lang="ru">Работа поддержана грантами РФФИ  № 10-02-13300,  11-02-97513, а также программами Министерства образования и науки РФ - 16.518.11.7030,  2.4053. 2011 и НШ-3088.2012.2. 	Авторы благодарны профессору Т. А. 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