Voltage-Controlled Optics of a Quantum Dot

Details Voltage-Controlled Optics of a Quantum Dot Voltage-Controlled Optics of a Quantum Dot

2004-08-04

arxiv.org/abs/cond-mat/0408089v3

Phys. Rev. Lett. 93, 217401 (2004)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

4 pages, 4 figures; content as published

Scientific paper

10.1103/PhysRevLett.93.217401

We show how the optical properties of a single semiconductor quantum dot can be controlled with a small dc voltage applied to a gate electrode. We find that the transmission spectrum of the neutral exciton exhibits two narrow lines with $\sim 2$ $\mu$eV linewidth. The splitting into two linearly polarized components arises through an exchange interaction within the exciton. The exchange interaction can be turned off by choosing a gate voltage where the dot is occupied with an additional electron. Saturation spectroscopy demonstrates that the neutral exciton behaves as a two-level system. Our experiments show that the remaining problem for manipulating excitonic quantum states in this system is spectral fluctuation on a $\mu$eV energy scale.

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