With the rapid development of technologies for the fabrication of, as well as applications of
low-dimensional structures, the demands on characterization techniques increase. Spatial …

Our economy consistently pushes for the development of increasingly complex materials to
meet the demands of high-efficiency energy conversion and high-performance engineering …

The possibility induction of light emission from silicon, an indirect bandgap material in which
radiative transitions are unlikely, raises several interesting and technologically important …

Combining two indirect-gap materials—with different electronic and optical gaps—to create
a direct gap material represents an ongoing theoretical challenge with potentially rewarding …

Electronic structure theory has recently been used to propose hypothetical compounds in
presumed crystal structures, seeking new useful functional materials. In some cases, such …

We report a full-band-structure calculation of frequency-dependent second-harmonic
generation in odd-period strained [(Si) n/(Ge) n]/Si (001) superlattices for n= 1, 3, and 5. We …

Surfaces and interfaces play an increasingly important role in today's solid state devices. In
this book the reader is introduced, in a didactic manner, to the essential theoretical aspects …

A tight-binding model in the three-center representation, with an orthogonal sp 3 set of
orbitals and interactions up to third neighbor, is introduced. This model gives a good …

Photoluminescence has been observed in the energy range 0.7 to 0.9 eV in short-period
Si/Ge strained-layer superlattices grown on Si (100) and Ge (100) substrates. The …

Abstract Two-dimensional (2D) crystals exhibit unique and exceptional properties and show
promise for various applications. In this work, we systematically studied the structures of a …