90 research outputs found
Electronic Properties of Charged Centers in Si0â‚‚-like Glasses
Contains report on one research project.Joint Services Electronics Program (Contract DAAG29-78-C-0020
Electronic Properties of Amorphous Silicon Dioxide
Contains report on one research project.Joint Services Electronics Program (Contract DAAG29-80-C-0104
Electronic Properties of Charged Centers in SiOâ‚‚-like Glasses
Contains a summary of research.Joint Services Electronics Program (Contract DAAB07-76-C-1400
Electronic Properties of Intrinsic Defects in Amorphous Silicon Dioxide
Contains report on one research project.Joint Services Electronics Program (Contract DAAG29-78-C-0020)Joint Services Electronics Program (Contract DAAG29-80-C-0104
Ultralow Temperature Studies of Electronic Conduction in Submicron Silicon Inversion Layers
Contains research summary.Joint Services Electronics Program (Contract DAALO3-86-K-0002
Single Electron Transistors
Contains description of one research project and a list of publications.Joint Services Electronics Program Contract DAAL03-92-C-0001National Science Foundation Grant ECS 88-13250National Science Foundation Grant ECS 92-0342
Electric-field driven insulating to conducting transition in a mesoscopic quantum dot lattice
We investigate electron transport through a finite two dimensional mesoscopic
periodic potential, consisting of an array of lateral quantum dots with
electron density controlled by a global top gate. We observe a transition from
an insulating state at low bias voltages to a conducting state at high bias
voltages. The insulating state shows simply activated temperature dependence,
with strongly gate voltage dependent activation energy. At low temperatures the
transition between the insulating and conducting states becomes very abrupt and
shows strong hysteresis. The high-bias behavior suggests underdamped transport
through a periodic washboard potential resulting from collective motion.Comment: 4 pages, 4 figure
Electronic transport in films of colloidal CdSe nanocrystals
We present results for electronic transport measurements on large
three-dimensional arrays of CdSe nanocrystals. In response to a step in the
applied voltage, we observe a power-law decay of the current over five orders
of magnitude in time. Furthermore, we observe no steady-state dark current for
fields up to 10^6 V/cm and times as long as 2x10^4 seconds. Although the
power-law form of the decay is quite general, there are quantitative variations
with temperature, applied field, sample history, and the material parameters of
the array. Despite evidence that the charge injected into the film during the
measurement causes the decay of current, we find field-scaling of the current
at all times. The observation of extremely long-lived current transients
suggests the importance of long-range Coulomb interactions between charges on
different nanocrystals.Comment: 11 pages, 10 figure
Multi-island single-electron devices from self-assembled colloidal nanocrystal chains
We report the fabrication of multi-island single-electron devices made by
lithographic contacting of self-assembled alkanethiol-coated gold nanocrystals.
The advantages of this method, which bridges the dimensional gap between
lithographic and NC sizes, are (1) that all tunnel junctions are defined by
self-assembly rather than lithography and (2) that the ratio of gate
capacitance to total capacitance is high. The rich electronic behavior of a
double-island device, measured at 4.2 K, is predicted in detail by combining
finite element and Monte Carlo simulations with the standard theory of Coulomb
blockade with very few adjustable parameters.Comment: 4 page
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