Abstract
In Chap. 5 we studied the Gunn effect as an example of negative differential resistance (NDR). This effect is observed in semiconductors, such as GaAs, whose conduction band structure satisfies a special condition, namely, the existence of higher conduction minima separated from the band edge by about 0.2–0.4 eV. As a way of achieving this condition in any semiconductor, Esaki and Tsu proposed in 1970 [9.1] the fabrication of an artificial periodic structure consisting of alternate layers of two dissimilar semiconductors with layer thicknesses of the order of nanometers. They called this synthetic structure a superlattice They suggested that the artificial periodicity would fold the Brillouin zone into smaller Brillouin zones or “mini-zones” and therefore create higher conduction band minima with the requisite energies for Gunn oscillations.
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References
Chapter 9
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Yu, P.Y., Cardona, M. (1996). Effect of Quantum Confinement on Electrons and Phonons in Semiconductors. In: Fundamentals of Semiconductors. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-662-03313-5_9
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