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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 pub-id-type="doi">10.17586/2220-8054-2015-6-2-224-243</article-id><article-id custom-type="elpub" pub-id-type="custom">najo-927</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>PAPERS, PRESENTED AT THE CONFERENCE</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="ru"><subject>PAPERS, PRESENTED AT THE CONFERENCE</subject></subj-group></article-categories><title-group><article-title>Time-dependent quantum circular billiard</article-title><trans-title-group xml:lang="ru"><trans-title></trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="western" xml:lang="en"><surname>Babajanov</surname><given-names>D. B.</given-names></name></name-alternatives><bio xml:lang="en"><p>17. Niyazov Str., 100095, Tashkent</p></bio><email xlink:type="simple">d_babajanov@yahoo.com</email><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="western" xml:lang="en"><surname>Matrasulov</surname><given-names>D. U.</given-names></name></name-alternatives><bio xml:lang="en"><p>17. Niyazov Str., 100095, Tashkent</p></bio><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="western" xml:lang="en"><surname>Sobirov</surname><given-names>Z. A.</given-names></name></name-alternatives><bio xml:lang="en"><p>60A, Amir Temur Str., 100000 Tashkent</p></bio><xref ref-type="aff" rid="aff-2"/></contrib><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="western" xml:lang="en"><surname>Avazbaev</surname><given-names>S. K.</given-names></name></name-alternatives><bio xml:lang="en"><p>ARC Centre for Antimatter-Matter Studies, Department of Applied Physics</p><p>G.P.O. Box U1987, Perth 6845</p></bio><xref ref-type="aff" rid="aff-3"/></contrib><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="western" xml:lang="en"><surname>Karpova</surname><given-names>O. V.</given-names></name></name-alternatives><bio xml:lang="en"><p>17. Niyazov Str., 100095, Tashkent</p></bio><xref ref-type="aff" rid="aff-1"/></contrib></contrib-group><aff xml:lang="en" id="aff-1"><institution>National University of Uzbekistan; Turin Polytechnic University in Tashkent</institution><country>Uzbekistan</country></aff><aff xml:lang="en" id="aff-2"><institution>National University of Uzbekistan; Tashkent Financial Institute</institution><country>Uzbekistan</country></aff><aff xml:lang="en" id="aff-3"><institution>Curtin University</institution><country>Australia</country></aff><pub-date pub-type="collection"><year>2015</year></pub-date><pub-date pub-type="epub"><day>14</day><month>08</month><year>2025</year></pub-date><volume>6</volume><issue>2</issue><fpage>224</fpage><lpage>243</lpage><permissions><copyright-statement>Copyright &amp;#x00A9; Babajanov D.B., Matrasulov D.U., Sobirov Z.A., Avazbaev S.K., Karpova O.V., 2025</copyright-statement><copyright-year>2025</copyright-year><copyright-holder xml:lang="ru">Babajanov D.B., Matrasulov D.U., Sobirov Z.A., Avazbaev S.K., Karpova O.V.</copyright-holder><copyright-holder xml:lang="en">Babajanov D.B., Matrasulov D.U., Sobirov Z.A., Avazbaev S.K., Karpova O.V.</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/927">https://nanojournal.ifmo.ru/jour/article/view/927</self-uri><abstract><p>The motion of a quantum particle in a time-dependent circular billiard is studied on the basis of the Schr¨odinger equation with time-dependent boundary conditions. The cases of monotonically expanding (contracting), non-harmonically, harmonically breathing circles the case when billiard wall suddenly disappears are explored in detail. The exact analytical solutions for monotonically expanding and contracting circles are obtained. For all cases, the time-dependence of the quantum average energy is calculated. It is found that for an harmonically breathing circle, the average energy is time-periodic in the adiabatic regime with the same period as that of the oscillation. For intermediate frequencies which are comparable with the initial frequency of the particle in unperturbed billiard, such periodicity is broken. However, for very high frequencies, the average energy once again becomes periodic. A qualitative analysis of the border between adiabatic and non-adiabatic regimes is provided.</p></abstract><kwd-group xml:lang="en"><kwd>quantum billiards</kwd><kwd>Schr¨odinger equation</kwd></kwd-group><funding-group><funding-statement xml:lang="en">This work is supported in part by a grant of Volkswagen Foundation (Nr. I/82 136).</funding-statement></funding-group></article-meta></front><back><ref-list><title>References</title><ref id="cit1"><label>1</label><citation-alternatives><mixed-citation xml:lang="ru">St¨ockmann H.-J. Quantum Chaos: An Introduction. Cambridge University Press, Cambridge, UK (1999).</mixed-citation><mixed-citation xml:lang="en">St¨ockmann H.-J. Quantum Chaos: An Introduction. Cambridge University Press, Cambridge, UK (1999).</mixed-citation></citation-alternatives></ref><ref id="cit2"><label>2</label><citation-alternatives><mixed-citation xml:lang="ru">Eckhardt B. Quantum mechanics of classically non-integrable systems. Phys. 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