Electron dynamics in rectangular double quantum dots

Abstract

The temporal evolution of an electron in a double rectangular quantum dot in the presence of an electric field pulse is explored in this work. In the framework of the effective mass approximation, first-order scattering rates for electron–electron and electron–longitudinal acoustic phonon interaction at room temperature are calculated in the high tunnelling regime, and used to evaluate the dynamics of the population and coherence of the first three confined levels under an electric field pulse. Small values of these rates dependent upon the coupling barrier make feasible the emission of coherent radiation near 0.1 THz.

Dipolar Transformations of 2D Distributions of Quantum Dots

“…Particular attention has been paid to the electronic and optical properties of these structures [1][2][3], because they are modified by quantum size and confinement effects. The quantum states of these systems are, to a certain extent, controllable through the tailoring of the quantum dots [3,4].…”

Electric-field-controlled electron relaxation in lateral double quantum dots embedded in a suspended slab

“…12 Many theoretical studies of electron relaxation in single and double QDs have been performed. [13][14][15][16] Electronphonon scattering can be effectively suppressed using various mechanisms to improve the performance of QD devices. [17][18][19][20][21] The manipulation and understanding of the electron relaxation in QDs are therefore of great importance in the design and the operation of the quantum devices.…”

Coupling effects on electron‐phonon scattering in double quantum dots

“…There is an agreement that electron-phonon interactions are the main decoherence channels, since embedded in or grown on host materials, the interaction between the confined carriers and the lattice nucleus is inevitable. Former works on electron-phonon interaction have been done for GaAs double quantum dots with harmonic infinite confinement potential [4,5], and for finite confinement in rectangular dots [6]. In this work we study spherical and cylindrical dots with a finite step potential confinement.…”

“…They are modelled as islands of GaAs embedded in an Al 0.4 Ga 0.6 As matrix. Parameters are as in reference [6]. The confinement potential is modelled as a finite potential step.…”