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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: Fabrication de couches d'inversion mise en evidence d'oscillations de conductance periodiques suggerent un mecanisme d'ondes de densite de charge ancrees.
Abstract: By use of x-ray lithography Si inversion layers have been fabricated with width \ensuremath{\sim}25 nm and mobility \ensuremath{\sim}15 000 ${\mathrm{cm}}^{2}$/V s. These display oscillations in their conductance that are periodic in the number of electrons per unit length, even in zero magnetic field. The oscillations reflect an oscillatory activation energy of the conductance and are accompanied by unusual nonlinearities suggestive of pinned charge-density waves.

269 citations

Journal ArticleDOI
TL;DR: It is found that the conductance fluctuation and weak-localization magnitudes are universal: they are independent of the size and shape of the cavity if the number of incoming modes, N, is large.
Abstract: We deduce the effects of quantum interference on the conductance of chaotic cavities by using a statistical ansatz for the S matrix. Assuming that the circular ensembles describe the S matrix, we find that the conductance fluctuation and weak-localization magnitudes are universal: they are independent of the size and shape of the cavity if the number of incoming modes, N, is large. The limit of small N is more relevant experimentally; here we calculate the full distribution of the conductance and find striking differences as N changes or a magnetic field is applied.

269 citations

Journal ArticleDOI
TL;DR: In this article, the conductance and stability of 1,4-bis(fullero[c]pyrrolidin-1-yl)benzene was determined using mechanically controllable break junctions in vacuum.
Abstract: We present results on a new fullerene-based anchoring group for molecular electronics. Using lithographic mechanically controllable break junctions in vacuum we have determined the conductance and stability of single-molecule junctions of 1,4-bis(fullero[c]pyrrolidin-1-yl)benzene. The compound can be self-assembled from solution and has a low-bias conductance of 3 x 10(-4) G0. Compared to 1,4-benzenedithiol the fullerene-anchored molecule exhibits a considerably lower conductance spread. In addition, the signature of the new compound in histograms is more significant than that of 1,4-benzenediamine, probably owing to a more stable adsorption motif. Statistical analyses of the breaking of the junctions confirm the stability of the fullerene-gold bond.

268 citations

Journal ArticleDOI
TL;DR: The sensitivity of the junctional conductance between isolated horizontal cells to dopamine is consistent with dopamine having a direct effect on coupling in intact retina and changes in intracellular pH and Ca2+ concentration are not involved in mediating the effect of dopamine on coupling.
Abstract: 1 Retinas from channel catfish were dissociated and the cells maintained in culture Horizontal cells that normally receive input from cone photoreceptors were identified The conductance of the electrical junction formed between a pair of 'cone' horizontal cells was measured by controlling the membrane voltage of each cell with a voltage clamp maintained through either a micropipette or a patch pipette The two techniques yielded similar results 2 Transjunctional current was measured while transjunctional voltage was stepped to values between +/- 60 mV The current (measured 5 ms after a step) was proportional to voltage over the range tested For steps to voltages greater than +/- 45 mV, the current exhibited a slight time-dependent decline 3 Dopamine decreased junctional conductance in a dose-dependent fashion A 50% reduction was obtained with 10 nM-dopamine The D1 agonist fenoldopam (100 nM) also decreased junctional conductance The uncoupling produced by either agent was rapid and reversible 4 The introduction of 100 microM-cyclic AMP into one cell of a pair decreased junctional conductance by, on average, 40% Forskolin (1-10 microM), an activator of adenylate cyclase, decreased junctional conductance 50-90% 5 The introduction of 80 microM-cyclic GMP into one cell of a pair decreased junctional conductance by, on average, 40% Nitroprusside (1-10 microM), an activator of guanylate cyclase, reduced junctional conductance 40-65% 6 The introduction of a peptide inhibitor specific for the cyclic AMP-dependent protein kinase reversed a decrease in junctional conductance produced by superfusion with either dopamine (1 microM), fenoldopam (100 nM) or forskolin (5-10 microM) 7 Intracellular Ca2+ concentration was measured with the fluorescent indicator Fura-2 The intracellular Ca2+ concentration was increased by activation of a Ca2+ current Junctional conductance remained constant as the internal Ca2+ concentration changed from 100 to 700 nM 8 Intracellular pH was measured with the fluorescent indicator bis-carboxyethylcarboxyfluorescein The application of acetate (25 mM) reduced intracellular pH by 02-03 units and decreased junctional conductance by approximately 50% A subsequent application of fenoldopam did not alter intracellular pH, but decreased junctional conductance by more than 50% 9 The sensitivity of the junctional conductance between isolated horizontal cells to dopamine is consistent with dopamine having a direct effect on coupling in intact retina Dopamine regulates the activity of a cyclic AMP-dependent protein kinase which in turn modulates junctional conductance Changes in intracellular pH and Ca2+ concentration are not involved in mediating the effect of dopamine on coupling Cyclic GMP and intracellular pH may participate in regulatory pathways independent of that used by cyclic AMP

267 citations

Journal Article
TL;DR: In this paper, the thermal conductance of interfaces between Al and Cu was measured in the temperature range 78 T 298 K using time-domain thermoreflectance, which is an order-of-magnitude larger than the phonon-mediated thermal conductances of typical metal-dielectric interfaces.
Abstract: The thermal conductance of interfaces between Al and Cu is measured in the temperature range 78 T 298 K using time-domain thermoreflectance. The samples are prepared by magnetron sputter deposition of a 100 nm thick film of Al on top of layers of Cu on sapphire substrates. The chemical abruptness of the Al-Cu interface is systematically varied by ion-beam mixing using 1 MeV Kr ions. The thermal conductance of the as-deposited Al-Cu interface is 4 GW m−2 K−1 at room temperature, an order-of-magnitude larger than the phonon-mediated thermal conductance of typical metal-dielectric interfaces. The magnitude and the linear temperature dependence of the conductance are described well by a diffuse-mismatch model for electron transport at interfaces.

266 citations


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