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Chinese Physics Letters

Tunnelling-Induced Transient Gain in an Asymmetric Double Quantum Well

Xu Wei-Hua, Wu Jin-Hui, Jin-Yue Gao

Published May 1, 2004• 6 citations
Publisher

Abstract

We investigate the transient behaviour of a weak probe in asymmetric double quantum well structures, where two excited states are coupled by resonant tunnelling through a thin barrier in a three-level system of electronic subbands. There is no external coherent coupling field applied, and we find that probe gain can be achieved during the transient process, which is induced by the coherent coupling of the upper states via the resonant tunnelling. We show that the transient behaviour of the probe depends on the coupling strength and the dephasing rate and can be tuned by changing the width of the tunnelling barrier.

DOI
10.1088/0256-307x/21/5/024

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We investigate the transient behaviour of a weak probe in asymmetric double quantum well structures, where two excited states are coupled by resonant tunnelling through a thin barrier in a three-level system of electronic subbands. There is no external coherent coupling field applied, and we find that probe gain can be achieved during the transient process, which is induced by the coherent coupling of the upper states via the resonant tunnelling. We show that the transient behaviour of the probe depends on the coupling strength and the dephasing rate and can be tuned by changing the width of the tunnelling barrier.
We have investigated the dispersive properties of tunnelling-induced transparency in asymmetric double quantum well structures where two excited states are coupled by resonant tunnelling through a thin barrier in a three-level system of electronic subbands. The intersubband transitions exhibit high dispersion at zero absorption, which leads to the slow light velocity in this medium as compared with that in vacuum ( c =3×10 8 ). The group velocity in a specific GaAs/AlGaAs sample is calculated to be v g = c /4.30. This structure can be used to compensate for the dispersion and energy loss in fibre optical communications.
We investigate the probe absorption properties in an asymmetric coupled double quantum-well structure for both the transient and steady-state processes.Beyond the rotating-wave approximation, we directly simulate the transient dynamics with the density-matrix equations.The probe absorption is found to be completely eliminated under the condition of two-photon resonance, without requiring the one-photon resonance condition.More interestingly, our results show that the absorption properties can be tuned by changing the tunnelling barrier.
We have investigated the dispersive properties of tunnelling-induced transparency in asymmetric double quantum well structures where two excited states are coupled by resonant tunnelling through a thin barrier in a three-level system of electronic subbands,The intersubband transitions exhibit high disperision at zero absorption,which leads to the slow light velocity in this medium as compared with that in vacuum(c=3×10^8).The group velocity in a specific GaAs/AlGaAs sample is calculated to be ug=c/4.30,This structure can be used to compensate for the dispersion and energy loss in fibre optical communications.
The authors designed an asymmetric double quantum well structure with three subbands in the conduction band,and then calculated energy values of the three subbands with the effective-mass Schrodinger equation of confined electrons.In particular,the two adjacent excited subbands were correlated to wave function due to the electronic tunneling effect.A weak probe field coupling the ground subband to the two excited subbands was found to have a double-peak absorption spectrum with an in-between transparency window.Applying a DC electric field on this double quantum well structure,one may easily change the ratio of dipole moments on the two probe transitions,and then effectively manipulate relative amplitudes of the two absorption peaks and the dispersion curve in the transparency window.