Dark Exciton Preparation in a Quantum Dot by a Longitudinal Light Field Tuned to Higher Exciton States

摘要: Several important proposals to use semiconductor quantum dots in information technology rely on the control of dark exciton ground states, such as based qubits with a $\mu$s life time. In this paper, we present an efficient way occupy state by single short laser pulse. The scheme is optical excitation longitudinal field component featured by, e.g., radially polarized beams or certain Laguerre-Gauss Bessel beams. Utilizing component, show within configuration interaction approach that high-energy states composed light-hole excitons and higher heavy-hole can be addressed. When relaxes, its created.