Epitaxial Displacement-etched GaAsSb Quantum Dots Emitting at Telecom Wavelengths

Sadhvikas Addamane; Sanghyeok Park; Quinn T. Campbell; Evan M. Anderson; Thomas Rotter; Darryl Shima; Julia Deitz; Paul Kotula; Ganesh Balakrishnan; Oleg Mitrofanov; Igal Brener; Prasad P. Iyer

arXiv · 2610.24768

Epitaxial Displacement-etched GaAsSb Quantum Dots Emitting at Telecom Wavelengths

Sadhvikas Addamane·Sanghyeok Park·Quinn T. Campbell·Evan M. Anderson·Thomas Rotter·Darryl Shima·Julia Deitz·Paul Kotula·Ganesh Balakrishnan·Oleg Mitrofanov·Igal Brener·Prasad P. Iyer

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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 (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.

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Sadhvikas Addamane, Sanghyeok Park, Quinn T. Campbell, Evan M. Anderson, Thomas Rotter, Darryl Shima, Julia Deitz, Paul Kotula, Ganesh Balakrishnan, Oleg Mitrofanov, Igal Brener, Prasad P. Iyer. 2026-10-17. Epitaxial Displacement-etched GaAsSb Quantum Dots Emitting at Telecom Wavelengths. https://arxiv.org/abs/2610.24768

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