Journal Article

PUBDB-2022-05258

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Culling a self-assembled quantum dot as a single-photon source using X-ray microscopy

Dey, A. B. (Corresponding author)DESY* ; Sanyal, M. (Corresponding author)Extern* ; Schropp, A.XFEL.EU*DESY* ; Achiles, S. ; Keller, T. F.XFEL.EU*DESY* ; Farrer, I.Extern* ; Ritchie, D. A. ; Bertram, F.DESY* ; Schroer, C.XFEL.EU*DESY* ; Seeck, O.DESY*

2023
Soc. Washington, DC

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Please use a persistent id in citations: doi:10.1021/acsnano.3c04835  doi:10.3204/PUBDB-2022-05258

Abstract: Epitaxially grown self-assembled semiconductor quantum dots (QDs) with atom-like optical properties, have emerged as the best choice for single photon sources required for the development of quantum technology and quantum networks. Nondestructive selection of a single QD having desired structural, compositional, and optical characteristics is essential to obtain noise-free, fully indistinguishable single or entangled photons out of single-photon emitters. Here, we show that the structural-orientations and local compositional-inhomogeneities within a single QD and the surrounding wet-layer can be probed in a screening fashion by scanning X-ray diffraction microscopy (SXDM) and X-ray fluorescence (XRF) with a few tens of nanometers-sized synchrotron radiation-beam. The presented measurement protocol can be used to cull the best single QD from the enormous number of self-assembled dots grown simultaneously. The results obtained show that the elemental composition and resultant strain profiles of a QD are sensitive to in-plane crystallographic directions. We also observe that lattice expansion after a certain composition-limit introduces shear strain within a QD, enabling the possibility of controlled chiral-QD formation. Nanoscale-chirality and compositional-anisotropy, contradictory to common assumption, need to be incorporated into existing theoretical models to predict the optical properties of single-photon sources and to further tune the epitaxial growth process of self-assembled quantum structures.

Note: The paper is published in "ASAP" category, the volume number and page number are yet to come. The DOI number is already assigned.

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Contributing Institute(s):

1. PETRA-D (FS-PETRA-D)
2. Nanolab (FS-NL)
3. DOOR-User (DOOR ; HAS-User)
4. FS-PETRA (FS-PETRA)

Research Program(s):

1. 632 - Materials – Quantum, Complex and Functional Materials (POF4-632) (POF4-632)
2. 6G3 - PETRA III (DESY) (POF4-6G3) (POF4-6G3)
3. NEP - Nanoscience Foundries and Fine Analysis - Europe|PILOT (101007417) (101007417)
4. INDIA-DESY - INDIA-DESY Collaboration (2020_Join2-INDIA-DESY) (2020_Join2-INDIA-DESY)

Experiment(s):

1. PETRA Beamline P06 (PETRA III)
2. PETRA Beamline P08 (PETRA III)

Appears in the scientific report 2023

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Database coverage:
; ; ; Clarivate Analytics Master Journal List ; Current Contents - Physical, Chemical and Earth Sciences ; Essential Science Indicators ; IF >= 15 ; JCR ; SCOPUS ; Science Citation Index Expanded ; Web of Science Core Collection

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