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Conductance

About: Conductance is a research topic. Over the lifetime, 8088 publications have been published within this topic receiving 235961 citations.


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Journal ArticleDOI
TL;DR: In this paper, the authors report thermal measurements on individual carbon nanotubes using a temperature sensing scanned microscope probe and present evidence for ballistic transport of both phonons and electrons in these tubes.
Abstract: We report thermal measurements on individual carbon nanotubes using a temperature sensing scanned microscope probe An arc-grown bundle of multiwalled nanotubes (MWNTs) is mechanically attached to a thermal probe The heat flow down individual MWNTs is recorded as a function of the temperature difference across them Simultaneous measurements of thermal and electrical conductance are recorded The size of the conductance steps observed at room temperature and the correlation between electrical and thermal conductance steps are discussed and we present evidence for ballistic transport of both phonons and electrons in these tubes

82 citations

Proceedings ArticleDOI
09 Jun 2008
TL;DR: The algorithm for computing probability distribution on the web-graph can estimate the approximate PageRank p of any node up to an additive error of √ε p in Õ(√M/α) passes and the relation between mixing time and conductance gives an estimate for the conductance of the graph.
Abstract: This study focuses on computations on large graphs (e.g., the web-graph) where the edges of the graph are presented as a stream. The objective in the streaming model is to use small amount of memory (preferably sub-linear in the number of nodes n) and a few passes.In the streaming model, we show how to perform several graph computations including estimating the probability distribution after a random walk of length l, mixing time, and the conductance. We estimate the mixing time M of a random walk in O(nα+Mα√n+√Mn/α) space and O(√Mα) passes. Furthermore, the relation between mixing time and conductance gives us an estimate for the conductance of the graph. By applying our algorithm for computing probability distribution on the web-graph, we can estimate the PageRank p of any node up to an additive error of √ep in O(√M/α) passes and O(min(nα + 1/e √M/α + 1/e Mα, αn√Mα + 1/e √M/α)) space, for any α ∈ (0, 1]. In particular, for e = M/n, by setting α = M--1/2, we can compute the approximate PageRank values in O(nM--1/4) space and O(M3/4) passes. In comparison, a standard implementation of the PageRank algorithm will take O(n) space and O(M) passes.

82 citations

Journal ArticleDOI
TL;DR: In this paper, field effect conductance measurements were made on individual microscopic crystals of the organic semiconductor sexithiophene (6T) and the resulting wire/6T/wire structures were used in a transistor configuration to probe the in-plane conductance of the crystals as a function of transverse electric field.
Abstract: Field effect conductance measurements were made on individual microscopic crystals of the organic semiconductor sexithiophene (6T). These crystals, ranging from 1 to 6 molecules (2−14 nm) in thickness and from 1 to 2 μm in diameter, were deposited by thermal evaporation onto SiO2 substrates previously patterned with closely spaced (∼400 nm) pairs of Au wires. Atomic force microscopy (AFM) of these substrates demonstrated the growth of individual 6T crystals between the wires. The resulting wire/6T/wire structures were used in a transistor configuration to probe the in-plane conductance of the crystals as a function of transverse electric field (i.e., perpendicular to the substrate). These measurements showed (1) no discernible dependence of the carrier mobility on thicknesseven down to crystals as thin as a monolayersuggesting that much of the current is carried by the first monolayer next to the SiO2, (2) activated transport (EA = 25 meV) at temperatures above 100 K but nearly temperature-independent tra...

82 citations

Journal ArticleDOI
TL;DR: The electrical properties of InN nanowires were investigated in four-point probe measurements and the shell conductivity is ascribed to an electron accumulation layer forming at the radial InN/In(2)O(3) interface.
Abstract: The electrical properties of InN nanowires were investigated in four-point probe measurements. The dependence of the conductance on the wire diameter allows distinguishing between "core" bulk (quadratic) and "shell" sheet (linear) contributions. Evidence of the formation of a thin In(2)O(3) layer at the surface of the nanowires is provided by X-ray core level photoemission spectroscopy. The shell conductivity is therefore ascribed to an electron accumulation layer forming at the radial InN/In(2)O(3) interface. Although conductance through the accumulation layer dominates for nanowires below a critical diameter of about 55 nm, the core channel cannot be neglected, even for small nanowires.

82 citations

Journal ArticleDOI
TL;DR: Apparent conductance changes observed in sequential measurements suggest the existence of bond fluctuation among the adsorption sites.
Abstract: Conductance was measured for the single molecules with S/Se anchoring on a Au surface using the point contact method with scanning tunneling microscopy that enables us to selectively perform a repeated analysis of a chosen target molecule. Apparent conductance changes observed in sequential measurements suggest the existence of bond fluctuation among the adsorption sites.

82 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
2023457
2022828
2021154
2020158
2019172
2018168