title: Influence of substrate orientation on exciton fine structure splitting of InAs/InP nanowire quantum dots.
abstract: : In this paper, we use an atomistic approach to investigate strain distributions, single particle and many body electronic properties of InAs/InP nanowire quantum dots with substrate orientation varying from [111] to high-index [119], and compared with [001] case. We show that single particle gap for high-index [11k] substrates is increased with respect to [111] and [001] cases, and oscillates with the substrate index due to faceting effects. Surprisingly, the overall shell-like structure of single particle states is preserved even for highly facetted, high-index substrates. On the contrary, we demonstrate that besides two limiting high-symmetry cases, [001] and [111], the bright exciton splitting varies strongly with substrate orientation. For [112]-oriented substrate, the fine structure splitting reaches maximum due to crystal lattice anisotropy despite fully cylindrical isotropic shape of nanowire quantum dot.
authors.affiliation: Instytut Fizyki, UMK, Grudzia̧dzka 5, Toruń, 87-100, Poland. mzielin@fizyka.umk.pl.
authors.forename: Michał
authors.initials: M
authors.lastname: Zieliński