Resonance and antiresonance effects in electronic transport through several-quantum-dot combinations

Abstract

We investigated the resonance and antiresonance effects in electronic transport through several-quantum-dot combinations by using the nonequilibrium Green’s function method. All distinctive quantum-dot (QD) arrangements with one to three QDs and with different architectures were studied systematically. The theoretical and numerical results show that a peak in the current-voltage spectrum can be attributed to the resonance effect, whereas a dip is due to the antiresonance effect. The results will help experimenters to better understand their electronic measurements.

A Transfer Hamiltonian approach in self-consistent field regime for transport in arbitrary quantum dot arrays

“…In this section, we first show the calculated current voltage curves I-V for different arrangements and we compare their with the results obtained using NEGFF [13]. We also present the number of electrons N i accumulated in the i th Qd in each configuration.…”

“…In the calculation we assumed symmetric coupling respect to the leads, T R1 = T L1 = 0.2 ‡. The evolution of the ‡ We use similar transmission values than Sun et al [13] in order to make possible the qualitative comparison between models. energy level with the applied bias voltage is…”

“…Finally, the results obtained using the proposed approach have been compared to the results of Sun et al [13]. In that paper the authors have used the nonequilibrium Green's function method (NEGFF) to study the electron transport between one, two and three Qds in several configurations.…”

“…However, up to now the only computation of transport in an extended arbitrary array of Qds was done by Carreras et al [12] but no local potential due to self-charge was included. Sun et al [13] have also studied the electron transport using NEGFF for different arrangements of Qds, from one to three Qds, without including the potential due to self-charge neither. The inclusion of the self-charge potential using this complex framework is usually impossible for large systems.…”

Charging time effects and transient current beats in horizontal and vertical quantum dot systems

“…The stationary properties of the electron current flowing through quantum dots (QDs) displayed in different geometries and coupled with two or more electron reservoirs were investigated in many experimental and theoretical works e.g. [1][2][3][4][5][6][7][8][9][10][11][12][13][14]. More interesting are the transport properties of QDs in the presence of time-dependent external fields (perturbations) or in the case of time-dependent tunnelling couplings between individual QDs.…”