TY - JOUR

T1 - Spatially-resolved emission of GaAs/AlGaAs quantum dots grown by nanohole-filled droplet epitaxy

AU - Дерибина, Екатерина Игоревна

AU - Мурзин, Алексей Олегович

AU - Башегурова, Елена Александровна

AU - Самсонова, Анна Юрьевна

AU - Ложкин, Максим Сергеевич

AU - Ловцюс, Вячеслав Альгердович

AU - Елисеев, Сергей Алексеевич

AU - Ефимов, Юрий Петрович

AU - Капитонов, Юрий Владимирович

PY - 2023/11/27

Y1 - 2023/11/27

N2 - GaAs/AlGaAs quantum dots created by the nanohole-filling droplet epitaxy are promising for applications in information photonics due to the low mechanical stress in these lattice-matched heterostructures. In this work, we have carried out a detailed study of the optical properties of such quantum dots using microphotoluminescence and reflection spectroscopy. For quantum dots grown by molecular beam epitaxy with a density of about 1 μm-2, the photoluminescence signal was scanned with a spatial resolution of about 1 μm. A correlation map was constructed for the spatial derivatives of the photoluminescence spectra in order to identify the emission bands that correlate with each other. It was found that QD A (E=1.56 eV), QD B1 (E=1.61eV), and QD B2 (E=1.65eV) bands originate from the same regions of the sample. The smaller width and the lower energy position of the QD A band allow it to be related to the central part of the quantum dot, while the QD B1 and the QD B2 bands' origins are smaller quantum-sized objects located around the same dot. All these bands are observed in anticorrelation with the signal from the heavy-hole exciton in the quantum well.

AB - GaAs/AlGaAs quantum dots created by the nanohole-filling droplet epitaxy are promising for applications in information photonics due to the low mechanical stress in these lattice-matched heterostructures. In this work, we have carried out a detailed study of the optical properties of such quantum dots using microphotoluminescence and reflection spectroscopy. For quantum dots grown by molecular beam epitaxy with a density of about 1 μm-2, the photoluminescence signal was scanned with a spatial resolution of about 1 μm. A correlation map was constructed for the spatial derivatives of the photoluminescence spectra in order to identify the emission bands that correlate with each other. It was found that QD A (E=1.56 eV), QD B1 (E=1.61eV), and QD B2 (E=1.65eV) bands originate from the same regions of the sample. The smaller width and the lower energy position of the QD A band allow it to be related to the central part of the quantum dot, while the QD B1 and the QD B2 bands' origins are smaller quantum-sized objects located around the same dot. All these bands are observed in anticorrelation with the signal from the heavy-hole exciton in the quantum well.

KW - квантовые точки

KW - молекулярно-пучковая эпитаксия

UR - https://www.mendeley.com/catalogue/87d9c1fa-6568-34f5-a42e-07867bbcff28/

U2 - 10.1103/physrevb.108.205305

DO - 10.1103/physrevb.108.205305

M3 - статья

VL - 108

JO - Physical Review B-Condensed Matter

JF - Physical Review B-Condensed Matter

SN - 1098-0121

IS - 20

M1 - 205305

ER -