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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-1182</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>MATHEMATICS</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="ru"><subject>МАТЕМАТИКА</subject></subj-group></article-categories><title-group><article-title>Threshold eigenfunctions and threshold resonances of some relativistic operators</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>Saitō</surname><given-names>Y.</given-names></name></name-alternatives><bio xml:lang="en"><p>Yoshimi Saitō – Emeritus Professor, Department of Mathematics</p><p>Birmingham</p></bio><email xlink:type="simple">saito@math.uab.edu</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>Umeda</surname><given-names>T.</given-names></name></name-alternatives><bio xml:lang="en"><p>Tomio Umeda – Department of Mathematical Sciences, Professor</p><p>Himeji</p></bio><email xlink:type="simple">umeda@sci.u-hyogo.ac.jp</email><xref ref-type="aff" rid="aff-2"/></contrib></contrib-group><aff-alternatives id="aff-1"><aff xml:lang="en">University of Alabama at Birmingham<country>United States</country></aff></aff-alternatives><aff-alternatives id="aff-2"><aff xml:lang="en">University of Hyogo<country>Japan</country></aff></aff-alternatives><pub-date pub-type="collection"><year>2011</year></pub-date><pub-date pub-type="epub"><day>18</day><month>08</month><year>2025</year></pub-date><volume>2</volume><issue>4</issue><fpage>71</fpage><lpage>77</lpage><permissions><copyright-statement>Copyright &amp;#x00A9; Saitō Y., Umeda T., 2025</copyright-statement><copyright-year>2025</copyright-year><copyright-holder xml:lang="ru">Saitō Y., Umeda T.</copyright-holder><copyright-holder xml:lang="en">Saitō Y., Umeda T.</copyright-holder><license 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/1182">https://nanojournal.ifmo.ru/jour/article/view/1182</self-uri><abstract><p>We give a review of recent developments on the study of threshold eigenfunctions and threshold resonances of magnetic Dirac operators and Pauli operators. Emphasis is placed on a proof of the non-existence of threshold resonances of the magnetic Dirac operators in a concise manner.</p></abstract><kwd-group xml:lang="en"><kwd>Dirac operators</kwd><kwd>magnetic potentials</kwd><kwd>threshold energies</kwd><kwd>threshold resonances</kwd><kwd>threshold eigenfunctions</kwd><kwd>zero modes</kwd></kwd-group><funding-group xml:lang="en"><funding-statement>TU is supported by Grant-in-Aid for Scientific Research (C) No. 21540193, Japan Society for the Promotion of Science.</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">Adam C., Muratori B., Nash C. Zero modes of the Dirac operator in three dimensions // Phys. Rev. D. — 1999. — V. 60. — 125001, 8 p.</mixed-citation><mixed-citation xml:lang="en">Adam C., Muratori B., Nash C. Zero modes of the Dirac operator in three dimensions // Phys. Rev. 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