Photoresponse improvement of mixed-dimensional 1D–2D GaAs photodetectors by incorporating constructive interface states

Improved photoresponse of InAs/GaAs quantum dot infrared photodetectors by using GaAs1−xSbx strain reducing layer

GaAs MESFET Photoresponse to CW Laser Probe

An effect, in planar GaAs MESFETs, whereby a sharp increaSe in optical gain at the transistor edges occurs, is reported. This gain effect only manifests when a large resistor is inserted in ser-ies with the gate, to produce the conditions for photovoltaic gate biasing. The mechanism for increased gãin, at t'he edges, is suggested to be due to carrier photogeneration in the substrate that is sub...

Improvement of Uncertainty Relations for Mixed States

We study a possible improvement of uncertainty relations. The Heisenberg uncertainty relation employs commutator of a pair of conjugate observables to set the limit of quantum measurement of the observables. The Schrödinger uncertainty relation improves the Heisenberg uncertainty relation by adding the correlation in terms of anti-commutator. However both relations are insensitive whether the s...

Quantum Dot Infrared Photodetectors: Photoresponse Enhancement Due to Potential Barriers

Potential barriers around quantum dots (QDs) play a key role in kinetics of photoelectrons. These barriers are always created, when electrons from dopants outside QDs fill the dots. Potential barriers suppress the capture processes of photoelectrons and increase the photoresponse. To directly investigate the effect of potential barriers on photoelectron kinetics, we fabricated several QD struct...

Interface states and Schottky barrier formation at metal/GaAs junctions

We report results of x-ray photoemission and cathodoluminescence spectroscopies studies of interface formation at metal-GaAs junctions. The results are interpreted by using a microscopic model of metal-semiconductor interfaces. Our low-temperature measurements and analyses show the validity of Schottky'S phenomenological description, thereby suggesting that metalinduced gap states and native de...