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Filaments are confined in two dimensions and immersed in a fluid described by the Brownian multiparticle collision dynamics approach. The applied shear flow causes conformational changes in a polymer, aligns it along the flow direction, and induces a tumbling motion at high flow rates. In an intermediate, activity-dependent shear-rate regime, a characteristic scaling exponent for the mean-square end-to-end distance along the gradient direction is observed. This exponent appears to be determined by the semiflexibility of the polymer. The tumbling dynamics exhibits a characteristic time, with a stronger dependence on the Weissenberg number than that of flexible active or passive polymers. Activity strongly impacts the rheological properties of semiflexible polymers and even implies a negative viscosity for weak flows. At very large values of the shear rate, shear dominates over activity, and passive-polymer behavior is assumed.<\/jats:p>","DOI":"10.1063\/5.0315709","type":"journal-article","created":{"date-parts":[[2026,4,22]],"date-time":"2026-04-22T11:24:25Z","timestamp":1776857065000},"update-policy":"https:\/\/doi.org\/10.1063\/aip-crossmark-policy-page","source":"Crossref","is-referenced-by-count":0,"title":["Two-dimensional active polar semiflexible polymer under shear flow"],"prefix":"10.1063","volume":"164","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-6267-4957","authenticated-orcid":false,"given":"A.","family":"Lamura","sequence":"first","affiliation":[{"name":"Istituto Applicazioni Calcolo, CNR 1 , Via Amendola 122\/D, 70126 Bari,","place":["Italy"]}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-7513-0796","authenticated-orcid":false,"given":"R. 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