transport – Page 3 – TechConnect Briefs

Quantum-Classical Transition Induced by Electrical Measurement

Mozyrsky D., Martin I., Los Alamos National Laboratory, US

A model of an electrical tunnel junction coupled to a mechanical system (oscillator) is studied to simulate the dephasing effect of measurement on a quantum system. The problem is solved at zero temperature under conditions [...]

Effects of Backbone Disorder on Electronic Transport in DNA Molecules

Zhong J.X., Oak Ridge National Laboratory, US

A minimal model was recently proposed to explain the gap opening and the semi-conductor behavior in poly(G)-poly(C) DNA molecules. In this model, the large band gap is attributed to the hybridization of the G-G p [...]

Convergence Issues in Ab-initio Transport Calculation through Oxide Barriers and Molecules

Fonseca L.R.C., Demkov A.A., Motorola, Inc., US

Ab-initio calculations of transport through nanometer scale structures, such as individual atoms or molecules and ultra-thin oxide barriers directly link atomic structure and chemistry, which are difficult to probe, to transport properties, which are easier [...]

Transport Properties For Carbon Nanotubes Under Hydrostatic Pressure

Chen F., Xue Y.Y., Stokes K.L., Wang H., Chu C.W., University of Houston, US

Multi-wall carbon nanotubes (MWNTs) were mixed with polystyrene (PS) by 20 wt%, which is close to the percolation threshold. Temperature (T) dependence of Seebeck coefficient (S) and resistance (R) for the sample (MWNT-PS) were measured [...]

Electronic Transport in Molecular Devices from First Principles

Di Ventra M., Lang N.D., Pantelides S.T., Virginia Tech, US

We present an overview of recent work by the authors in first-principles calculations of electronic transport in molecules for which experimental results are available. We find that the shape of the current-voltage characteristics is mostly [...]

Inverted Method for Simulation of Electrokinetic Transport in Microchannel Devices

Nilson R.H., Griffiths S.K., Sandia National Laboratories, US

An inverted method of solution is used to numerically solve the equations governing electrokinetic fluid flow and species transport in microscale turns, junctions and curved channels. Rather than solving for the electric potential and fluid [...]

Hydrodynamic Dispersion of a Neutral Non-Reacting Solute in Electroosmotic Flows

Griffiths S.K., Nilson R.H., Sandia National Laboratory, US

To investigate hydrodynamic dispersion in electroosmotic ?ow, we have derived an asymptotic series solution for the problem of two-dimensional species transport in a tube or channel. This solution is applicable to the late-time diÆusive and [...]