Enable a facile size re-distribution of MBE-grown Ga-droplets via in situ pulsed laser shooting
in-situ pulsed laser
molecular beam epitaxy
Subject Categories::F361 Laser Physics
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AbstractA MBE-prepared Gallium (Ga)-droplet surface on GaAs (001) substrate is in situ irradiated by a single shot of UV pulsed laser. It demonstrates that laser shooting can facilely re-adjust the size of Ga-droplet and a special Ga-droplet of extremely broad size-distribution with width from 16 to 230 nm and height from 1 to 42 nm are successfully obtained. Due to the energetic inhomogeneity across the laser spot, the modification of droplet as a function of irradiation intensity (IRIT) can be straightly investigated on one sample and the correlated mechanisms are clarified. Systematically, the laser resizing can be perceived as: for low irradiation level, laser heating only expands droplets to make mergences among them, so in this stage, the droplet size distribution is solely shifted to the large side; for high irradiation level, laser irradiation not only causes thermal expansion but also thermal evaporation of Ga atom which makes the size-shift move to both sides. All of these size-shifts on Ga-droplets can be strongly controlled by applying different laser IRIT that enables a more designable droplet epitaxy in the future.
CitationGeng B, Shi Z, Chen C, Zhang W, Yang L, Deng C, Yang X, Miao L, Peng C (2021) 'Enable a facile size re-distribution of MBE-grown Ga-droplets via in situ pulsed laser shooting', Nanoscale research letters, 16 (126), pp.-.
JournalNanoscale research letters
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