Interminiband Rabi oscillations in biased semiconductor superlattices

Abstract

Carrier dynamics at energy level anticrossings in biased semiconductor superlattices, was studied in the time domain by solving the time-dependent Schrödinger equation. The resonant nature of interminiband Rabi oscillations has been explicitly demonstrated to arise from interference of intrawell and Bloch oscillations. We also report a simulation of direct Rabi oscillations across three minibands, in the high field regime, due to interaction between three strongly coupled minibands.

Landau–Zener tunnelling in 2D periodic structures in the presence of a gauge field: I. Tunnelling rates

“…In recent years we have seen a recovering of interest to the Landau-Zener tunneling (LZ-tunneling) in periodic structures. Although this phenomenon was originally discussed with respect to Bloch oscillations (BO) of crystal electrons in a strong electric field [1][2][3][4], nowadays the most successful experimental systems are semiconductor superlattices [5][6][7], one-demensional arrays of optical waveguides [8][9][10][11], and cold atoms in quasi 1D optical lattices [12][13][14][15][16][17][18][19][20][21][22][23][24][25][26][27]. These systems allow access to many different aspects of LZ-tunneling including the resonant tunneling [6,13,16,20,23,26], LZ-tunneling in binary (double-periodic) lattices [11,21,22,25], time-resolved LZ-tunneling [15,24], modification of LZ-tunneling by nonlinearity caused by atom-atom interactions [18-20, 22, 23, 26], etc.…”

Resonant carrier dynamics in strongly biased superlattices

“…While we have used perturbation theory to interpret our calculated results, the good fits obtained by using Equations (9,10) suggest that the model remains valid at strong biases as well. We attribute this to the fact that the structure of the Wannier-Stark ladder is preserved over the bias domain considered [13]. At stronger electric fields, however, Bloch oscillations are replaced by sequential tunnelling, and projection on minibands refers merely to the wavepacket's distribution in energy (and hence between wells in real space), rather than a decomposition into Wannier-Stark states.…”

“…Note that the intrawell oscillation frequency is a natural frequency of the system: ω nm = (E m − E n )/h. Given the fact that interminiband transitions of an electron are a result of quantum interference of Bloch and intrawell oscillations [13], one can extend this analogy to Rabi oscillations. Then the SL would be subject to a field of natural frequency ω nm , modulated by the Bloch frequency ω B .…”

Effect of Noise on the Decoherence of a Central Electron Spin Coupled to an Antiferromagnetic Spin Bath

“…Nowadays the most successful experimental systems are semiconductor superlattices [5] that allow access to many different aspects of LZ tunneling [6,7] including decoherence when associated to noise or interaction with the environmental degrees of freedom [8][9][10]. Thus, it is possible to manipulate the values of the environment or system parameters at any time such that the qubits undergo one-qubit or two-qubit gate operations [11][12][13].…”