{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,9,16]],"date-time":"2026-09-16T09:08:20Z","timestamp":1789549700097,"version":"build-2803163510"},"reference-count":50,"publisher":"MDPI AG","issue":"18","license":[{"start":{"date-parts":[[2026,9,14]],"date-time":"2026-09-14T00:00:00Z","timestamp":1789344000000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"DOI":"10.13039\/100000001","name":"Designing Materials to Revolutionize and Engineer our Future (DMREF) program","doi-asserted-by":"publisher","award":["DMR-2323669"],"award-info":[{"award-number":["DMR-2323669"]}],"id":[{"id":"10.13039\/100000001","id-type":"DOI","asserted-by":"publisher"}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Nanomaterials"],"abstract":"<jats:p>We investigate the optical and electronic properties of a spherical AlSb\/InAs\/AlSb core\/shell\/shell quantum dot (QD) under the combined effects of size confinement and an external magnetic field. The system contains a centrally located hydrogenic donor impurity whose attractive Coulomb interaction affects the distribution of electronic energy levels, their corresponding wavefunctions, and their optical responses. The total optical absorption coefficients and refractive index changes are analyzed as functions of incident photon energy by systematically varying the core radius and the applied magnetic field. The results reveal a tunable optical absorption resonance associated with the E1\u2192E2 intersubband transition, whose spectral position and amplitude are strongly modified by the core radius, magnetic-field strength, and presence of the hydrogenic impurity. Increasing the magnetic field intensity from 0 to 30 T redshifts the optical absorption and refractive index peaks by 20\u201360 meV, reflecting the predominance of magnetic effects in the total confining potential. In contrast, expanding the internal quantum dot radius (core radius) also leads to a redshift, but in a lower-energy range of incident photons (0\u201320 meV), governed primarily by the quantum-size confinement effect. This net distinction in energy-shift ranges indicates that applying a magnetic field offers a broader tuning mechanism than quantum-size effects in the proposed core\/shell\/shell QDs. Furthermore, the coexistence of two distinct absorption ranges underscores the potential of AlSb\/InAs\/AlSb spherical QDs for various technological applications, including multi-band, magnetically tunable infrared and THz-infrared optical photodetectors.<\/jats:p>","DOI":"10.3390\/nano16181152","type":"journal-article","created":{"date-parts":[[2026,9,14]],"date-time":"2026-09-14T14:15:04Z","timestamp":1789395304000},"page":"1152","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Linear and Nonlinear Optical Properties of an AlSb\/InAs\/AlSb Spherical Quantum Dot in a Magnetic Field"],"prefix":"10.3390","volume":"16","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-1004-4109","authenticated-orcid":false,"given":"Sake","family":"Wang","sequence":"first","affiliation":[{"name":"College of Science, Jinling Institute of Technology, 99 Hongjing Avenue, Nanjing 211169, China"}],"role":[{"vocabulary":"crossref","role":"author"},{"role":"writing-review-editing","vocabulary":"credit"},{"role":"writing-original-draft","vocabulary":"credit"},{"role":"validation","vocabulary":"credit"},{"role":"formal-analysis","vocabulary":"credit"},{"role":"investigation","vocabulary":"credit"},{"role":"visualization","vocabulary":"credit"}]},{"given":"Hassen","family":"Dakhlaoui","sequence":"additional","affiliation":[{"name":"Physics Department, Nanomaterials Technology Unit, Basic and Applied Scientific Research Center (BASRC), College of Science of Dammam, Imam Abdulrahman Bin Faisal University, Dammam 31441, Saudi Arabia"}],"role":[{"vocabulary":"crossref","role":"author"},{"role":"conceptualization","vocabulary":"credit"},{"role":"investigation","vocabulary":"credit"},{"role":"visualization","vocabulary":"credit"},{"role":"methodology","vocabulary":"credit"},{"role":"writing-original-draft","vocabulary":"credit"},{"role":"writing-review-editing","vocabulary":"credit"},{"role":"formal-analysis","vocabulary":"credit"},{"role":"validation","vocabulary":"credit"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-3477-8043","authenticated-orcid":false,"given":"Bryan M.","family":"Wong","sequence":"additional","affiliation":[{"name":"Department of Chemistry, Department of Physics & Astronomy, and Materials Science & Engineering Program, University of California-Riverside, Riverside, CA 92521, USA"}],"role":[{"vocabulary":"crossref","role":"author"},{"role":"writing-review-editing","vocabulary":"credit"},{"role":"writing-original-draft","vocabulary":"credit"},{"role":"funding-acquisition","vocabulary":"credit"},{"role":"validation","vocabulary":"credit"},{"role":"formal-analysis","vocabulary":"credit"},{"role":"project-administration","vocabulary":"credit"},{"role":"supervision","vocabulary":"credit"},{"role":"resources","vocabulary":"credit"}]}],"member":"1968","published-online":{"date-parts":[[2026,9,14]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"113903","DOI":"10.1016\/j.physe.2019.113903","article-title":"Exciton phonon properties in cylindrical quantum dot with parabolic confinement potential under electric field","volume":"118","author":"Mommadi","year":"2020","journal-title":"Phys. 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