Publication

Complex Pattern of Impurity States in Shallow Semiconductor Quantum-Wells

Alfredo Pasquarello
1991
Journal Articles

Abstract

Electronic states bound to impurities located in the quantum well barriers are calculated when the bulk binding energy is comparable to the quantum well depth. We show the existence of a complex level pattern due to the interaction between barrierlike states and states which are essentially confined in the well. The effects of an electric field are also discussed.

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Alfredo Pasquarello
1991
Journal Articles

Abstract

Official source

Related concepts (27)

Electric field

An electric field (sometimes E-field) is the physical field that surrounds electrically charged particles and exerts force on all other charged particles in the field, either attracting or repelling them. It also refers to the physical field for a system of charged particles. Electric fields originate from electric charges and time-varying electric currents. Electric fields and magnetic fields are both manifestations of the electromagnetic field, one of the four fundamental interactions (also called forces) of nature.

Surface states

Surface states are electronic states found at the surface of materials. They are formed due to the sharp transition from solid material that ends with a surface and are found only at the atom layers closest to the surface. The termination of a material with a surface leads to a change of the electronic band structure from the bulk material to the vacuum. In the weakened potential at the surface, new electronic states can be formed, so called surface states.

Quantum

In physics, a quantum (: quanta) is the minimum amount of any physical entity (physical property) involved in an interaction. The fundamental notion that a physical property can be "quantized" is referred to as "the hypothesis of quantization". This means that the magnitude of the physical property can take on only discrete values consisting of integer multiples of one quantum. For example, a photon is a single quantum of light of a specific frequency (or of any other form of electromagnetic radiation).

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