Polarized excitons in nanorings and the optical Aharonov-Bohm effect
By A. Govorov, Sergio E. Ulloa, K. Karrai, R. J. Warburton. 2002
157 citations recorded by the source corpus.
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 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.
Subfields: Atomic and Molecular Physics, and Optics, Electrical and Electronic Engineering
View Paper: https://www.semanticscholar.org/paper/ccce84fe740f7c493b61a8c582ac0523cc059038
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In Atomic and Molecular Physics, and Optics
In Electrical and Electronic Engineering
Citations in the corpus
- Optical Properties of Semiconductor Quantum Dots (2008, background): “The AB effect can also be observed for an electron-hole pair (a neutral exciton) on condition that in a ring-like structure the electron and hole move over different paths, resulting in a nonzero electric dipole moment [117].”