Polarized excitons in nanorings and the `optical' Aharonov-Bohm effect

Details Polarized excitons in nanorings and the `optical' Aharonov-Bohm effect Polarized excitons in nanorings and the `optical' Aharonov-Bohm effect

2002-07-06

arxiv.org/abs/cond-mat/0207183v2

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

6 pages, 3 figures; Phys.Rev.B RC (accepted); e-mail: govorov@ohio.edu

Scientific paper

10.1103/PhysRevB.66.081309

The quantum nature of matter lies in the wave function phases that accumulate while particles move along their trajectories. A prominent example is the Aharonov-Bohm phase, which has been studied in connection with the conductance of nanostructures. However, optical response in solids is determined by neutral excitations, for which no sensitivity to magnetic flux would be expected. We propose a new mechanism for the topological phase of a neutral particle, a polarized exciton confined to a semiconductor quantum ring. We predict that this magnetic-field induced phase may strongly affect excitons in a system with cylindrical symmetry, resulting in switching between `bright' exciton ground states and novel `dark' states with nearly infinite lifetimes. Since excitons determine the optical response of semiconductors, the predicted phase can be used to tailor photon emission from quantum nanostructures.

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