A review of molecular-beam epitaxy of GaAs and the observation of surface structures with
high-energy electron diffraction in an ultrahigh-vacuum system is described. The utilization of …

… AY CHO and … Cho has recently observed that Sn has a tendency to segregate at the growth
surface, producing doping profiles which are not as sharp as those obtained using Si or Ge. …

SHORTLY after the birth of quantum mechanics, von Neumann and Wigner made the
remarkable proposal 1 that certain spatially oscillating attractive potentials could support bound …

Quantum cascade (QC') lasers are reviewed. These are semiconductor injection lasers based
on intersubband transitions in a multiple-quantum-well (QW) heterostructure, designed by …

High-power and highly directional semiconductor microcylinder lasers based on an optical
resonator with deformed cross section are reported. In the favorable directions of the far-field, …

A semiconductor injection laser that differs in a fundamental way from diode lasers has
been demonstrated. It is built out of quantum semiconductor structures that were grown by …

A generalized analysis of wave propagation in periodic layered media is applied to the special
case of optical surface waves. These waves, confined to the interface between a periodic …

The high power operation of mid‐infrared quantum cascade lasers at temperatures up to T=320
K is reported. Gain at high temperature is optimized by a design combining low doping, …

… Capasso, DL Sivco, and AY Cho, “Recent progress in quantum cascade lasers and …
Mohammed, and AY Cho, “Sequential resonant tunneling through a multiquantum-well superlattice,” …

A new technique utilizing conventional x‐ray diffraction in conjunction with total external
reflection has provided a powerful tool for studying ordered interfaces and surface phenomena. …