Now showing items 101-110 of 169
RAPID COMMUNICATION: Lateral hopping conductivity and large negative magnetoresistance in InAs/AlGaAs self-organized quantum dots
(IOP Publishing Ltd, 2002-08-07)
We report experimental studies on lateral transport in self-organized quantum dots. We find that below 100 K, conduction occurs through interdot hopping and that experimental results are described quite well by a ...
Characterization of focal field formed by a large numerical aperture paraboloidal mirror and generation of ultra-high intensity (10 22 W/cm 2 )
(Springer-Verlag, 2005-06)
We describe a method to measure the aberrations of a high numerical aperture off-axis paraboloid and correct for the aberrations using adaptive optics. It is then shown that the characterized aberrations can be used to ...
Pion production under the action of intense ultrashort laser pulse on a solid target
(Nauka/Interperiodica; MAIK "Nauka/Interperiodica" ; Springer Science+Business Media, 2001-12)
Two-dimensional “particle-in-cell” modeling was carried out to determine the laser intensity threshold for pion production by protons accelerated by the relativistically strong short laser pulses acting on a solid target. ...
Wave and particle measurements near the lower-hybrid frequency
(IOP Publishing Ltd, 1977-05-01)
Experimental results are presented on lower-hybrid waves excited in a plasma column by an electrostatic coupler. It is found that the observed wave patterns which clearly show resonance cones, are as predicted by a theory ...
A proposed narrow-band-gap base transistor structure
(Elsevier, 1989)
A transistor structure is proposed which alleviates the problem of high base resistance in the narrow quantum-well base region of the Resonant-Tunneling Transistor (RTT). This idea may also be used to improve the performance ...
Diffusion effects in short-channel GaAs MESFETs
(Elsevier, 1989-03)
Diffusion effects in short-channel GaAs MESFETs are studied using a two-dimensional electron temperature simulation. A structure that consists of two n+-n contacts on a thin channel region was used as a test vehicle for ...
Numerical modeling of abrupt heterojunctions using a thermionic-field emission boundary condition
(Elsevier, 1993-03)
We present a numerical model in which the thermionic and tunneling mechanisms across an abrupt heterojunction interface are taken into account on the basis of the one dimensional drift-diffusion formulation. We use an ...
Monte Carlo analysis of repeated overshoot structures
(Elsevier, 1985)
The effectiveness of two recently proposed repeated overshoot structures is investigated using Monte Carlo simulation. Results are presented showing electron velocity, energy and valley occupancy as a function of bias ...
Ordered subsets algorithms for transmission tomography
(IOP Publishing Ltd, 1999-11-01)
The ordered subsets EM (OSEM) algorithm has enjoyed considerable interest for emission image reconstruction due to its acceleration of the original EM algorithm and ease of programming. The transmission EM reconstruction ...