Publications

By a cleaved-edge overgrowth method with molecular beam epitaxy and a (110) growth-interrupt anneal, we have fabricated a GaAs quantum well exactly 30 monolayers thick bounded by atomically smooth

High-quality T-shaped quantum wire lasers are fabricated by cleaved-edge overgrowth with the molecular beam epitaxy on the interface improved by a growth-interrupt high-temperature anneal.

A tunable quantum-cascade (QC) laser has been flown on NASA's ER-2 high-altitude aircraft to produce the first atmospheric gas measurements with this newly invented device, an important milestone i

Optical interband absorption experiments are performed on GaAs doping superlattices, which have a sawtooth-shaped conduction and valence-band potential.

Optical interband absorption and photoluminescence experiments are performed on GaAs doping superlattices, which have a sawtooth-shaped conduction and valence-band potential.

Optical absorption and photoluminescence experiments are performed on GaAs doping superlattices, which have a delta-function- like doping profile of alternating n-type and p-type dopant sheets.

The quantum-grid infinitesimal bit cryptosystem presents a unique blend of stream-cipher technology and principles of quantum-physics.

The coherent-state representation of quantum-mechanical propagators as well- defined phase-space path integrals involving Wiener measure on continuous phase-space paths in the limit that the diffus

Nondegenerate four-wave mixing driven by two pulsed pumps transfers the quantum state of an input signal pulse to an output idler pulse, which is a frequency-converted and reshaped version of the s

Resonant tunneling has attracted a great deal of attention as both a novel physical phenomena and a potential basis for useful devices.