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We investigate the excitonic properties of a core-multishell semiconductornanowire with type-II band mismatch, i.e. with spatially separated electronsand holes, under an external magnetic field. Our results demonstrate that,depending on the core wire radius, the carrier in the type-II band exhibitseither a quantum dot-like or a quantum ring-like energy spectrum, correspondingto a carrier confinement in the core wire or in the outer shell, respectively.In the latter, a shell-to-core confinement transition can be induced byincreasing the magnetic field intensity, which may lead to interestingphotocurrent properties of these confining structures, tunable by the externalfield.

Magnetic field induced shell-to-core confinement transition in type-II semiconductor quantum wires