Damping of charge oscillations in double-well structures by the Coulomb interaction

Mihael Ziger; Walter Poetz; P. Kocevar

doi:10.1117/12.175909

6 May 1994 Damping of charge oscillations in double-well structures by the Coulomb interaction

Mihael Ziger, Walter Poetz, P. Kocevar

Proceedings Volume 2142, Ultrafast Phenomena in Semiconductors; (1994) https://doi.org/10.1117/12.175909
Event: OE/LASE '94, 1994, Los Angeles, CA, United States

Abstract

We present results of a theoretical study of tunneling of laser-generated conduction-band electrons between two adjacent GaAs-AlGaAs quantum wells. Carriers are excited in the left well by a suitable sub-picosecond laser pulse. Damping of ensuing charge oscillations due to the electron-electron interaction is studied within the density-matrix formalism. A tractable set of generalized Boltzmann equations is derived which accounts for carrier generation, an exact treatment of the tunneling process, and the Coulomb interaction between electrons within the adiabatic (scattering) approximation. A detailed study of the evolution of the electron distribution is presented. We have found that, depending on structural parameters and excitation levels, the Coulomb interaction provides an efficient agent to destroy phase coherence in the system and to drive the system back towards equilibrium.

Citation Download Citation

Mihael Ziger, Walter Poetz, and P. Kocevar "Damping of charge oscillations in double-well structures by the Coulomb interaction", Proc. SPIE 2142, Ultrafast Phenomena in Semiconductors, (6 May 1994); https://doi.org/10.1117/12.175909

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