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Phys. Mater."],"published-print":{"date-parts":[[2026,9,1]]},"abstract":"Abstract<\/jats:title>\n \n Atomic substitution provides a controlled route to engineer lattice dynamics in low-symmetry two-dimensional materials. Here, by combining polarization-resolved Raman spectroscopy and first-principles calculations, we investigate the evolution of phonon characteristics in CrSBr\n \n \n \n <\/jats:tex-math>\n \n \n \n \n \n 1<\/mml:mn>\n \u2212<\/mml:mo>\n x<\/mml:mi>\n <\/mml:mrow>\n <\/mml:msub>\n <\/mml:mrow>\n <\/mml:math>\n <\/jats:inline-formula>\n Cl\n \n \n \n <\/jats:tex-math>\n \n \n \n \n \n x<\/mml:mi>\n <\/mml:mrow>\n <\/mml:msub>\n <\/mml:mrow>\n <\/mml:math>\n <\/jats:inline-formula>\n (\n \n \n \n <\/jats:tex-math>\n \n \n 0<\/mml:mn>\n \u2a7d<\/mml:mtext>\n x<\/mml:mi>\n \u2a7d<\/mml:mtext>\n \n \u223c<\/mml:mo>\n <\/mml:mrow>\n 0.5<\/mml:mn>\n <\/mml:mrow>\n <\/mml:math>\n <\/jats:inline-formula>\n ) upon partial substitution of Br with Cl atoms. Progressive Cl substitution of Br induces systematic shifts of parent CrSBr out-of-plane\n \n \n \n <\/jats:tex-math>\n \n \n \n A<\/mml:mi>\n g<\/mml:mtext>\n <\/mml:msub>\n <\/mml:mrow>\n <\/mml:math>\n <\/jats:inline-formula>\n phonon modes and activates additional Raman features. These features persist across different polarization configurations and excitation energies, reflecting substitution-induced symmetry lowering and local lattice perturbations. Explicit supercell phonon calculations combined with Raman\n \n \n \n <\/jats:tex-math>\n \n \n \u0393<\/mml:mi>\n <\/mml:mrow>\n <\/mml:math>\n <\/jats:inline-formula>\n -density-of-states simulations identify these features as symmetry-lowered descendants of parent modes arising from alloy disorder. Complementary strain-dependent calculations reveal that anisotropic lattice compression plays a key role in renormalizing Cr\u2013S dominated phonons. Under near-resonant excitation, stimulated Raman scattering-like amplification remains observable with increasing Cl content, highlighting the resilience of anisotropic electron\u2013phonon coupling in this system.\n <\/jats:p>","DOI":"10.1088\/2515-7639\/ae7696","type":"journal-article","created":{"date-parts":[[2026,6,2]],"date-time":"2026-06-02T22:59:33Z","timestamp":1780441173000},"page":"035004","update-policy":"https:\/\/doi.org\/10.1088\/crossmark-policy","source":"Crossref","is-referenced-by-count":0,"title":["Robust phonon engineering and symmetry-selective lattice dynamics in CrSBr\n 1\u2013x<\/sub>\n Cl\n x<\/sub>"],"prefix":"10.1088","volume":"9","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-7306-1806","authenticated-orcid":true,"given":"Satyam","family":"Sahu","sequence":"first","affiliation":[{"name":"J. 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Published by IOP Publishing Ltd","name":"copyright_information","label":"Copyright Information"},{"value":"2026-02-01","name":"date_received","label":"Date Received","group":{"name":"publication_dates","label":"Publication dates"}},{"value":"2026-06-01","name":"date_accepted","label":"Date Accepted","group":{"name":"publication_dates","label":"Publication dates"}},{"value":"2026-06-16","name":"date_epub","label":"Online publication date","group":{"name":"publication_dates","label":"Publication dates"}}]}}