Towards external-gate tuning of a single semiconductor quantum dot

In this work, a novel approach for tuning a single quantum dot photon source by the quantum confined stark effect by way of external contacts is presented. This is achieved by building a quantum dot (QD) single photon source (SPS) from the bottom up. A QD is a semiconductor island grown using self-assembly on a different semiconductor, such that an electron in a QD is confined in three spatial dimensions and its energy band structure changes into discrete energy levels. In this work such a sample with many indium gallium arsenide QDs is investigated, first its known properties are probed in order to confirm that this is a candidate for a ”good” SPS. Then, a mount with external gates is fabricated in which the sample can be inserted, in order to tune its emission frequency by the quantum confined stark effect, which can be used to due the energy levels of the QD. This method is in principle much simpler compared to traditional methods, and we show first steps towards a single photon...Show moreIn this work, a novel approach for tuning a single quantum dot photon source by the quantum confined stark effect by way of external contacts is presented. This is achieved by building a quantum dot (QD) single photon source (SPS) from the bottom up. A QD is a semiconductor island grown using self-assembly on a different semiconductor, such that an electron in a QD is confined in three spatial dimensions and its energy band structure changes into discrete energy levels. In this work such a sample with many indium gallium arsenide QDs is investigated, first its known properties are probed in order to confirm that this is a candidate for a ”good” SPS. Then, a mount with external gates is fabricated in which the sample can be inserted, in order to tune its emission frequency by the quantum confined stark effect, which can be used to due the energy levels of the QD. This method is in principle much simpler compared to traditional methods, and we show first steps towards a single photon source using our method.Show less

Leiden University Student Repository

Documents

In Collections

Towards external-gate tuning of a single semiconductor quantum dot