Effects of spontaneously generated coherence on resonance fluorescence from triple quantum dot molecules

Abstract

We investigate the spectrum of the resonance fluorescence from the lateral triple quantum dots controlled by voltage and obtain some interesting features such as controllable triple narrow peaks. In our system we use tunneling instead of coupling lasers, and the positions, widths and heights of the resonance fluorescence peaks can be controlled by tuning the tunneling couplings. We explain the observed spectrum with the transition properties of the dressed states generated by the coupling of the two tunneling and the laser field. These features can also be viewed as the effects of Spontaneously Generated 2 Coherence between the close-lying levels in the dressed state picture of the tunneling couplings. And the scheme proposed here can permit the observation of Spontaneously Generated Coherence.

Controllable cavity linewidth narrowing via spontaneously generated coherence in a four level atomic system

“…And SGC can also be simulated by additional fields in the dressedstate picture [42][43][44][45][46][47][48]. Moreover, the tunneling effect in quantum wells and quantum dots can also lead to quantum interference [49][50][51][52]. Therefore, the scheme proposed here can be equally applied to the above systems where SGC exists.…”

“…And most recently, by the coherent laser fields we experimentally observed SGC on absorption and fluorescence in rubidium atomic beam [46][47][48]. Besides, in quantum wells and quantum dots, the tunneling effect can also lead to quantum interference [49][50][51][52]. Therefore, although our scheme proposed here is difficult to be carried out with atoms in a free vacuum, it can be equally applied and achieved with the above systems.…”

Role of tunneling induced coherence in modulation of absorption and dispersion in a quantum dot molecule with symmetrical coupling configuration

“…With the recent advancement of technology in engineering semiconductor heterostructures leading to semiconductor quantum dots (SQDs), a lot of works has been performed to establish coherent optical effects in SQD-nanostructures . In respect of relevance to the aims and objectives of the present study, we present a brief summary of the works carried out in the recent past in the SQD-systems named as quantum dot molecules (QDM) [31,33,36,[38][39][40], [42,44,[46][47][48][49][50][51][52][53][54][55][56][57][58]. Control of EIT has been shown in various schemes [42,55], [57], which has been used to investigate such phenomena as slow light [42], infrared pulse storage [33] and slow optical soliton [36].…”

Controllable Tunneling of Light through a Quantum-Dot-Molecule Dielectric Film via Electromagnetically Induced Transparency

“…A quantum-dot molecule is a system of two or more coupled quantum dots, where coherent electronic states form through inter-dot tunneling [17] [18]. There have been many interesting applications and effects realized in quantum-dot molecular media, e.g., optical bistability [19] [20], slow light [21] [22], resonance fluorescence [23], electron-hole excitons [24], quantum interference and unusual optical responses [25], as well as tripartite hybrid quantum entanglement [26].…”