Topic
Conductance
About: Conductance is a research topic. Over the lifetime, 8088 publications have been published within this topic receiving 235961 citations.
Papers published on a yearly basis
Papers
More filters
TL;DR: The conductance of the Al wires is found to oscillate with a period of four atoms as the length of the wire is varied, and this behavior is explained using a resonant transport model based on the electronic structure of the infinite wire.
Abstract: We present first-principles calculations based on density functional theory for the conductance of monatomic Al wires between Al(111) electrodes. In contrast to the even-odd oscillations observed in other metallic wires, the conductance of the Al wires is found to oscillate with a period of four atoms as the length of the wire is varied. Although local charge neutrality can account for the observed period, it leads to an incorrect phase. We explain the conductance behavior using a resonant transport model based on the electronic structure of the infinite wire.
67 citations
TL;DR: The anion conductance of frog muscle has been studied at alkaline, neutral and acid extracellular pH values using a voltage clamp technique using rubidium in order to simplify the behavior of the cation conductance.
Abstract: 1. The anion conductance of frog muscle has been studied at alkaline, neutral and acid extracellular pH values using a voltage clamp technique. Potassium in the extracellular solution was replaced by rubidium in order to simplify the behavior of the cation conductance.
2. At pH 9·8 the chloride conductance fell exponentially during a hyperpolarizing voltage step. The speed of inactivation was directly proportional to the hyperpolarization from the holding potential; at 60 mV the rate constant was about 0·01 msec−1.
3. An exponential fall in chloride current during the voltage pulse also occurred at pH 7·4; the speed of inactivation, which was proportional to the membrane potential, was about 20% greater at neutral than at alkaline pH values.
4. The instantaneous voltage—current relation was approximately linear at pH 7·4 and 9·8; the instantaneous conductance was always greater at the alkaline pH value.
5. At neutral pH values when there were no time-dependent conductance changes the voltage—current relation was linear.
6. In acid solutions (pH 5·0) the chloride current gradually increased during a hyperpolarizing voltage step. The time course of this increase was complex, but it took place at greater speed during large voltage steps.
7. Comparison of the steady-state voltage—current relations measured in the absence and presence of chloride ions confirmed that in alkaline solutions the chloride current could reach a limiting value.
8. The equilibrium potential for the time-dependent conductance changes was close to the holding potential.
67 citations
TL;DR: In this article, an organic, nonvolatile memory based on dopant concentration-induced conductance changes in a conjugated polymer was reported. But the performance of the memory was limited to 1μs when a voltage exceeding its threshold values (>+3.5V or <−3.8V).
Abstract: We report an organic, nonvolatile memory based on dopant concentration-induced conductance changes in a conjugated polymer. Consisting of a polymer poly [2-methoxy-5-(2′-ethylhexyloxy)-p-phenylene vinylene] (MEH-PPV)/ionic conductor (RbAg4I5) bilayer sandwiched between two metal electrodes, the device is electrically switched between its low-conductance “off” state and high-conductance “on” state reversibly and repeatedly with on/off ratios above two orders of magnitude and pulse durations as short as 1μs when a voltage exceeding its threshold values (>+3.5V or <−3.8V) is applied. The conductance change is attributed to the injection/depletion of iodide dopant ions in the MEH-PPV layer by the applied electric field.
67 citations
TL;DR: In this paper, an antiresonance scattering can occur when an extra defect level is introduced into a conduction band and the conductance of a one-dimensional wire disappears, in good agreement with ab initio calculations.
Abstract: For the ballistic quantum transport, the conductance of each channel is quantized to a value of ${2e}^{2}/h.$ In the presence of defects, electrons will be scattered such that the conductance will deviate from the values of the quantized conductance. We show that an antiresonance scattering can occur when an extra defect level is introduced into a conduction band. At the antiresonance scattering, exactly one quantum conductance of a one-dimensional wire disappears, in good agreement with ab initio calculations. The conductance takes a nonzero value when the Fermi energy is away from the antiresonance scattering.
67 citations
TL;DR: The results of this study could be tentatively accounted for by an assumption that one of the rate-limiting steps of proton conduction through gramicidin channels represents, in fact, movement of negatively charged species (negative ionic defects) across a membrane.
67 citations