Dynamics of directly created excitons in asymmetric double quantum wells

P. Aceituno, H. Cruz, and A. Hernández-Cabrera
Phys. Rev. B 54, 17677 – Published 15 December 1996
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Abstract

In this work, we have studied the dynamics of an electrically pumped exciton that is directly created by hole-assisted electron resonant tunneling in an asymmetric coupled quantum well system. We have numerically integrated in space and time the effective-mass Schrödinger equation for the electron-hole pair taking into account the two-particle nature of the tunneling process. We have also included the time evolution of the transition from spatially indirect to direct excitons. Considering a different exciton binding energy for each quantum well, we have obtained a different charge oscillation semiperiod for each binding energy case. In this way, the possibility is shown of having a new kind of terahertz electromagnetic radiation emerging from such a semiconductor quantum well system after electric pumping.

  • Received 24 June 1996

DOI:https://doi.org/10.1103/PhysRevB.54.17677

©1996 American Physical Society

Authors & Affiliations

P. Aceituno, H. Cruz, and A. Hernández-Cabrera

  • Departamento de Física Fundamental y Experimental, Universidad de La Laguna, 38206 La Laguna, Tenerife, Spain

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Vol. 54, Iss. 24 — 15 December 1996

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