Quantum coherent control of coulomb enhancement by two-color pulseshaping

摘要

Pulse shaping based on two-color optical excitation is shown to provide a versatile coherent control scheme for electron inter(sub)band transitions in semiconductors. In semiconductor heterostructures, this control scheme provides both phase-sensitive absorption and exciton formation, as well as interwell tunneling of photoexcited charge carriers. Our microscopic analysis shows that this control mechanism is due to a combination of many-body effects arising from the coherent part of the electron-electron Coulomb interaction and pulse-shaping arising from the spectral overlap between the two pulses. This control mechanism is applicable to a wide range of semiconductors, both bulk and low-dimensional structures, and may have a practical application for phase sensitive absorbers and the generation of THz radiation. (C) 2001 John Wiley & Sons, Inc. [References: 27]