Effect of initial crystallization temperature and surface diffusion on formation of GaAs multiple concentric nanoring structures by droplet epitaxy

Wang Yi^{1, 2}, Guo Xiang^{1, 2, 3}, Wei Jiemin², Yang Chen^{1, 3, 4}, Luo Zijiang^{1, 4}, Wang Jihong¹, Ding Zhao^{1, 2, 3, †}

(a) Schematic drawing of diffusion of gallium atoms and trapped arsenic atoms. (b) Schematic drawing of the formation process of CNRs. Definition of the third ring radii (r_c1); the second ring uadius (r_c); the inner ring radius (r_Ga); height of the inner ring (h_inner); height of the second ring (h_outer0); height of the third ring (h_outer1).