Epitaxial Displacement-etched GaAsSb Quantum Dots Emitting at Telecom Wavelengths
Abstract
Semiconductor quantum dots (QDs) are essential components for integrated photonic and quantum information systems, yet current epitaxial growth techniques face significant limitations in complexity of growth, material selection, and density tunability. Here we report a displacement etch technique that enables controlled formation of GaAsSb QDs with emission at telecommunications wavelengths. Our approach uses arsenic molecular flux (As2) to react with antimonide surfaces through thermodynamically favorable displacement reactions, creating three-dimensional quantum confined nanostructures without requiring strain-driven growth or complex droplet-based processes. Density functional theory shows the two competing As-for-Sb exchange pathways to be nearly equivalent in both reaction energy and activation barrier, which places morphological control in the subsequent adatom kinetics rather than in the surface reaction itself. A single process parameter, the As2 exposure, sets the QD areal density across three orders of magnitude, from 102 to 105 μm−2, covering both isolated emitters and dense gain media. Structural analysis reveals well-defined GaAsSb QDs with a mixed GaAs/GaSb composition and no extended defects. Temperature-dependent photoluminescence measurements confirm emission at 1550 nm (0.8 eV) within the telecommunications C-band, with characteristic QD-like temperature dependence. Because the QDs form on a lattice-matched GaSb surface in a single growth step, the technique offers a practical route to C-band emitters built into the GaSb/AlGaSb device family already used for mid-infrared sources and detectors.
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BibTeX
@misc{addamane2026epitaxial,
title = {{Epitaxial Displacement-etched GaAsSb Quantum Dots Emitting at Telecom Wavelengths}},
author = {Sadhvikas Addamane and Sanghyeok Park and Quinn T. Campbell and Evan M. Anderson and Thomas Rotter and Darryl Shima and Julia Deitz and Paul Kotula and Ganesh Balakrishnan and Oleg Mitrofanov and Igal Brener and Prasad P. Iyer},
howpublished = {arXiv},
year = {2026},
month = oct,
doi = {10.48550/arxiv.2610.24768},
eprint = {2610.24768},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2610.24768},
}
RIS
TY - UNPB
TI - Epitaxial Displacement-etched GaAsSb Quantum Dots Emitting at Telecom Wavelengths
AU - Sadhvikas Addamane
AU - Sanghyeok Park
AU - Quinn T. Campbell
AU - Evan M. Anderson
AU - Thomas Rotter
AU - Darryl Shima
AU - Julia Deitz
AU - Paul Kotula
AU - Ganesh Balakrishnan
AU - Oleg Mitrofanov
AU - Igal Brener
AU - Prasad P. Iyer
PY - 2026
DA - 2026/10/17
PB - arXiv
DO - 10.48550/arxiv.2610.24768
UR - https://arxiv.org/abs/2610.24768
AB - Semiconductor quantum dots (QDs) are essential components for integrated photonic and quantum information systems, yet current epitaxial growth techniques face significant limitations in complexity of growth, material selection, and density tunability. Here we report a displacement etch technique that enables controlled formation of GaAsSb QDs with emission at telecommunications wavelengths. Our approach uses arsenic molecular flux (As_2) to react with antimonide surfaces through thermodynamically favorable displacement reactions, creating three-dimensional quantum confined nanostructures without requiring strain-driven growth or complex droplet-based processes. Density functional theory shows the two competing As-for-Sb exchange pathways to be nearly equivalent in both reaction energy and activation barrier, which places morphological control in the subsequent adatom kinetics rather than in the surface reaction itself. A single process parameter, the As_2 exposure, sets the QD areal density across three orders of magnitude, from 10^2 to 10^5 μm^−2, covering both isolated emitters and dense gain media. Structural analysis reveals well-defined GaAsSb QDs with a mixed GaAs/GaSb composition and no extended defects. Temperature-dependent photoluminescence measurements confirm emission at 1550 nm (0.8 eV) within the telecommunications C-band, with characteristic QD-like temperature dependence. Because the QDs form on a lattice-matched GaSb surface in a single growth step, the technique offers a practical route to C-band emitters built into the GaSb/AlGaSb device family already used for mid-infrared sources and detectors.
ER -