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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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TL;DR: Using the supersymmetry method, the conductance distribution function for a system of noninteracting electrons is calculated for the first time exactly.
Abstract: We present a complete analytical theory of conductance fluctuations in quantum dots in the regime of chaotic dynamics. Using the supersymmetry method we calculate for the first time exactly the conductance distribution function for a system of noninteracting electrons. Knowledge of this quantity enables us to obtain information about statistical properties of wave functions of a closed dot. The far tail of the distribution function describes fluctuations of resonance conductance in the Coulomb blockade regime
68 citations
TL;DR: In this article, the electrochemical gating of a single anthraquinone-based molecule bridged between two gold electrodes using the STM break-junction technique was reported.
Abstract: Herein we report the electrochemical gating of a single anthraquinone-based molecule bridged between two gold electrodes using the STM break-junction technique. Once a molecule is trapped between the STM gold tip and the gold substrate, the potential is swept in order to alternate between the oxidized anthraquinone (AQ) and the reduced hydroanthraquinone (H2AQ) forms. It is shown that the conductance increases about an order of magnitude with a net conversion from the oxidized AQ form to the reduced H2AQ form. The results obtained from sweeping the potential (dynamic approach) on a single molecule are compared to those obtained from measuring the conductance at several fixed potentials (static approach). By comparing the static and dynamic approach, qualitative information about the kinetics of the redox conversion was achieved. The threshold potential of the conductance enhancement was found to shift to more negative potentials when the potential is swept at a single molecule. This shift is attributed to...
67 citations
TL;DR: In this article, the length-dependent conductance of molecular wires and quantum dot array has been theoretically investigated based on finite size one-dimensional model and it has been clarified that the dependences of the conductance on the length of the chain have qualitatively different characteristics even for noninteracting electrons as the Fermi energy of the lead is varied relative to the energy spectra of atoms.
Abstract: The length-dependent conductance of molecular wires and quantum dot array has been theoretically investigated based on finite size one-dimensional model. It has been clarified that the dependences of the conductance on the length of the chain have qualitatively different characteristics even for noninteracting electrons as the Fermi energy of the lead is varied relative to the energy spectra of atoms. It has also been found that the relative magnitude of the transfer integrals in the chain and the electrode, and those between the electrode and the chain plays a crucial role on the conductance. We have found length dependence in these cases have more physics besides the even-odd oscillatory behavior, which has been studied in a special case of the atomic wire system. The dephasing effects and the effects of strong correlation in the dot have been briefly investigated based on the Hubbard chain. A simple formula for the conductance given here may be useful to analyze band calculation results and experimental results.
67 citations
TL;DR: In situ measurements of surface conductance, combined with simultaneous observations of reflection high-energy electron diffraction, clearly demonstrated strong dependence of the conductance on substrate-surface structures and epitaxial growth styles at early stages of Ag and Au depositions on Si(111) surface at room temperature.
Abstract: In situ measurements of surface conductance, combined with simultaneous observations of reflection high-energy electron diffraction, clearly demonstrated strong dependence of the conductance on substrate-surface structures and epitaxial growth styles at early stages of Ag and Au depositions on Si(111) surface at room temperature. The conductance showed a large change with a small amount of deposition (<0.1 monolayer) on the substrate of a metal-induced superstructure (√3×√3-Ag or 5×2-Au), while it scarcely changed for a clean 7×7 substrate
67 citations
TL;DR: Wires near a zero temperature transition between superconducting and metallic states are considered, which leads to a universal frequency, temperature, and length dependence of the conductance.
Abstract: We consider wires near a zero temperature transition between superconducting and metallic states. The critical theory obeys hyperscaling, which leads to a universal frequency, temperature, and length dependence of the conductance; quantum and thermal phase slips are contained within this critical theory. Normal, superconducting, and mixed (SN) leads on the wire determine distinct universality classes. For the SN case, wires near the critical point have a universal dc conductance which is independent of the length of the wire at low temperatures.
67 citations