Monolithic axial InGaAs quantum dot emitters in GaAs-based nanowires via Sb-mediated facet engineering
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2026
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| author | Jeong, Hyowon W. Koulas-Simos, Aris Limame, Imad Döblinger, Markus Kim, Sang Kyu Palekar, Chirag C. Finley, Jonathan J. Reitzenstein, Stephan Koblmüller, Gregor |
| author_facet | Jeong, Hyowon W. Koulas-Simos, Aris Limame, Imad Döblinger, Markus Kim, Sang Kyu Palekar, Chirag C. Finley, Jonathan J. Reitzenstein, Stephan Koblmüller, Gregor |
| contents | GaAs-based nanowires hosting active quantum heterostructures provide a promising route toward monolithic integration of single-photon sources on silicon, a key requirement for scalable quantum photonics. However, ultrathin axial quantum-emitter formation is often hindered by facet-dependent growth dynamics and rotational twins, which induce lateral overgrowth and compromise interface abruptness. Here, we develop InGaAs-based quantum emitters by tailoring facet evolution via dilute Sb incorporation, which efficiently suppresses twins and promotes confined axial insertion at the growth-front facet. This approach significantly enhances the probability of obtaining abrupt, few-nanometer-thin quantum dots at the nanowire tip. Single-nanowire optical spectroscopy reveals intense, spatially localized emission from the active region with lifetimes as short as (0.51 $\pm$ 0.02) ns, and second-order photon-correlation measurements consistently exhibit pronounced antibunching with $g^{(2)}(0)<0.4$, confirming single-photon emission. These results establish a strong correlation between twin density and axial heterostructure formation, identifying defect control as a key factor in realizing monolithically integrated nanowire single-photon sources. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2605_13992 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Monolithic axial InGaAs quantum dot emitters in GaAs-based nanowires via Sb-mediated facet engineering Jeong, Hyowon W. Koulas-Simos, Aris Limame, Imad Döblinger, Markus Kim, Sang Kyu Palekar, Chirag C. Finley, Jonathan J. Reitzenstein, Stephan Koblmüller, Gregor Applied Physics Mesoscale and Nanoscale Physics Materials Science GaAs-based nanowires hosting active quantum heterostructures provide a promising route toward monolithic integration of single-photon sources on silicon, a key requirement for scalable quantum photonics. However, ultrathin axial quantum-emitter formation is often hindered by facet-dependent growth dynamics and rotational twins, which induce lateral overgrowth and compromise interface abruptness. Here, we develop InGaAs-based quantum emitters by tailoring facet evolution via dilute Sb incorporation, which efficiently suppresses twins and promotes confined axial insertion at the growth-front facet. This approach significantly enhances the probability of obtaining abrupt, few-nanometer-thin quantum dots at the nanowire tip. Single-nanowire optical spectroscopy reveals intense, spatially localized emission from the active region with lifetimes as short as (0.51 $\pm$ 0.02) ns, and second-order photon-correlation measurements consistently exhibit pronounced antibunching with $g^{(2)}(0)<0.4$, confirming single-photon emission. These results establish a strong correlation between twin density and axial heterostructure formation, identifying defect control as a key factor in realizing monolithically integrated nanowire single-photon sources. |
| title | Monolithic axial InGaAs quantum dot emitters in GaAs-based nanowires via Sb-mediated facet engineering |
| topic | Applied Physics Mesoscale and Nanoscale Physics Materials Science |
| url | https://arxiv.org/abs/2605.13992 |