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What is a bandgap?

What is a bandgap? Here are some definitions.

Noun
  1. (physics) The energy difference between two allowed ranges of electron energy in a solid; especially the difference between the energies of the valence band and the conduction band.
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Recently, we also demonstrated the existence of a bandgap guidance in topology whose diameter is smaller than the wavelength and the index of refraction may be higher than the elements of the photonic structure.
Microstrip transmission lines with an electromagnetic bandgap structure exhibit stopband and slow-wave characteristics, which can be used as stop band or low-pass filters.
Its wide bandgap, high electron mobility, high saturation and peak electron drift velocity, and high breakdown voltage, make it an ideal material for high power, high frequency electronic devices.
The structure, morphology, electrical resistivity, optical bandgap, as well as thermal stability of the deposited films are investigated.
Gallium nitride is a wide bandgap, compound semiconductor, with a number of inherent material properties that make it very attractive for designing and manufacturing high performance, robust, electronic components.
Several research groups are investigating ways to create a bandgap in graphene, says Dr Hill.

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