Semiconductor Superlattices

Abstract

This chapter discusses the key properties of semiconductor superlattices, which are a class of artificial, new crystals created by the alternating deposition of different semiconductors. These superlattices allow one to “design” electronic properties such as band widths and dispersions over a large range by changing the geometrical parameters of the superlattice and the composition of the semiconductors it is composed of. By using this design freedom, it is possible to realize periodic structures which are much more suitable for observing Bloch oscillations than bulk semiconductors are.

After a brief introduction, we first describe the electronic properties of superlattices without an electric field. Then, we discuss the electronic properties under a static bias field, leading to the Wannier-Stark ladder. Finally, we briefly outline the optical properties and experimental observations of the Wannier-Stark ladder.