- noun a thin layer of material with a high density of electrons whose potential energy is less than the surrounding layers and whose motion is restricted to one dimension, often used in laser and semiconducting applications
- A semiconductor heterostructure in which an extremely thin semiconductor layer with a narrower band-gap is surrounded by two layers with a wider bandgap. This allows charge carriers to move perpendicular to the direction of the crystal growth, but not in the same direction. A quantum well has one dimension, and is used, for instance, in transistors and semiconductor lasers.
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