title: Spatial carrier confinement in core-shell and multishell nanowire heterostructures.
abstract: We have derived an analytical effective-mass model and employed first-principles density functional theory to study the spatial confinement of carriers in core-shell and multishell structured semiconductor nanowires. The band offset effect is analyzed based on the subband charge density distributions, which is strongly dependent upon the strain relaxation. First-principles calculation results for spatially confined Si/Ge and GaN/GaP nanowires indicate accumulation of a Ge-core hole gas and a GaN-core electron gas, respectively, in agreement with experimental observations.
authors.affiliation: Department of Physics and Center for Functional Nanoscale Materials, Clark Atlanta University, Atlanta, Georgia 30314, USA.
authors.forename: A
authors.initials: A
authors.lastname: Nduwimana
authors.forename: R N
authors.initials: RN
authors.lastname: Musin
authors.forename: A M
authors.initials: AM
authors.lastname: Smith
authors.forename: Xiao-Qian
authors.initials: XQ
authors.lastname: Wang