Publication

Ultrafast electron transfer in type II GaAs/AlAs superlattices by femtosecond luminescence

Benoît Marie Joseph Deveaud
1995
Journal Articles

Abstract

Electron transfer from GaAs wells (Gamma wavefunctions) to AlAs barriers (X wavefunctions) in GaAs / AlAs type II superlattices has been studied by time resolved luminescence with femtosecond resolution. Transfer times can be as short as 140 fs for narrow wells and as long as 25 ps for the widest wells. They do not depend appreciably on the barrier thickness. We discuss the possible contribution to the transfer mechanism of state mixing, intervalley scattering and Frolich interaction. Our measurement favors phonon assisted, intervalley type scattering, modified by the overlap of the different wavefunctions.

Official source

https://infoscience.epfl.ch/entities/publication/1739f65f-2fc1-42f3-8d5e-ed5ae0f585bb

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Benoît Marie Joseph Deveaud
1995
Journal Articles

Abstract

Official source

https://infoscience.epfl.ch/entities/publication/1739f65f-2fc1-42f3-8d5e-ed5ae0f585bb

About this result

Related concepts (16)

Photoluminescence

Photoluminescence (abbreviated as PL) is light emission from any form of matter after the absorption of photons (electromagnetic radiation). It is one of many forms of luminescence (light emission) and is initiated by photoexcitation (i.e. photons that excite electrons to a higher energy level in an atom), hence the prefix photo-. Following excitation, various relaxation processes typically occur in which other photons are re-radiated.

Electron transfer

Electron transfer (ET) occurs when an electron relocates from an atom or molecule to another such chemical entity. ET is a mechanistic description of certain kinds of redox reactions involving transfer of electrons. Electrochemical processes are ET reactions. ET reactions are relevant to photosynthesis and respiration and commonly involve transition metal complexes. In organic chemistry ET is a step in some commercial polymerization reactions. It is foundational to photoredox catalysis.

Quantum tunnelling

In physics, quantum tunnelling, barrier penetration, or simply tunnelling is a quantum mechanical phenomenon in which an object such as an electron or atom passes through a potential energy barrier that, according to classical mechanics, the object does not have sufficient energy to enter or surmount. Tunneling is a consequence of the wave nature of matter, where the quantum wave function describes the state of a particle or other physical system, and wave equations such as the Schrödinger equation describe their behavior.

Related publications (1)

Ultrafast electron transfer in type II GaAs/AlAs superlattices by femtosecond luminescence

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Electron-Hole Plasma Decay Time in Gaas/(Ga, Al)as Quantum-Wells