Ultrafast single-electron transfer in coupled quantum dots driven by a few-cycle chirped pulse

Articles you may be interested in The influence of quantum dot size on the sub-bandgap intraband photocurrent in intermediate band solar cells Appl. Mixed state effects in waveguide electro-absorbers based on quantum dots Appl. Inhibited single-electron transfer by electronic band gap of two-dimensional Au quantum dot superlattice Appl. Final-state readout of exciton qubits by observing resonantly excited photoluminescence in quantum dots Appl. We theoretically study the ultrafast transfer of a single electron between the ground states of a coupled double quantum dot (QD) structure driven by a nonlinear chirped few-cycle laser pulse. A time-dependent Schr€ odinger equation without the rotating wave approximation is solved numerically. We demonstrate numerically the possibility to have a complete transfer of a single electron by choosing appropriate values of chirped rate parameters and the intensity of the pulse. Even in the presence of the spontaneous emission and dephasing processes of the QD system, high-efficiency coherent transfer of a single electron can be obtained in a wide range of the pulse parameters. Our results illustrate the potential to utilize few-cycle pulses for the excitation in coupled quantum dot systems through the nonlinear chirp parameter control, as well as a guidance in the design of experimental implementation. V C 2014 AIP Publishing LLC.