Conductance

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

Intermolecular effect in molecular electronics.

Abstract: We investigate the effects of lateral interactions on the conductance of two molecules connected in parallel to semi-infinite leads. The method we use combines a Green function approach to quantum transport with density functional theory for the electronic properties. The system, modeled after a self-assembled monolayer, consists of benzylmercaptane molecules sandwiched between gold electrodes. We find that the conductance increases when intermolecular interaction comes into play. The source of this increase is the indirect interaction through the gold substrate rather than direct molecule-molecule interaction. A striking resonance is produced only 0.3 eV above the Fermi energy.

Conductance of Single C60 Molecule Bridging Metal Electrodes

Abstract: We have developed an ultrahigh vacuum (UHV) system equipped with a mechanically controllable break junction to investigate single molecular conductivity in UHV. Fabrication of the metal nanogap and introduction of molecules into the metal nanogap were performed without breaking vacuum. Using this system, we investigated the electrical conductance of a single C60 molecule bridging between Au or Ag electrodes at 300 K. The conductance of C60 was determined to be 0.2(±0.1) G0 (G0=2e2/h) and 0.5 (±0.1) G0 for the single molecular junction with Au and Ag electrodes, respectively. Insight into the stability of the molecular junction was obtained by analyzing the conductance traces and conductance histograms observed at the transformation process during the stretching.

First-principles simulations of the stretching and final breaking of Al nanowires: Mechanical properties and electrical conductance

Abstract: The evolution of the structure and conductance of an Al nanowire subject to a tensile stress has been studied by first-principles total-energy simulations Our calculations show the correlation between discontinuous changes in the force (associated with changes in the bonding structure of the nanowire) and abrupt modifications of the conductance as the nanowire develops a thinner neck, in agreement with the experiments We reproduce the characteristic increase of the conductance in the last plateau, reaching a value close to the conductance quantum ${G}_{0}{=2e}^{2}/h$ before the breaking of the nanowire A dimer defines the contact geometry at these last stages, with three channels (one dominant) contributing to the conductance

Electric-field-induced conductance transition in 8-hydroxyquinoline aluminum (Alq3)

Abstract: We report an electric-field-induced conductance transition from an insulating state to a conducting state in a thin layer of Alq3 sandwiched between two metal electrodes. Field-induced switching behavior with a high on-off ratio of ∼105 is observed in the devices, in which the cathode electrode is Al and the anode electrode is varied including Al, Au, and indium tin oxide. The switching behavior is absent in devices in which both electrodes have a high work function, indicating that efficient electron injection has an important role in the electric-field-induced switching behavior of Alq3-based single-layer devices.

Junction of three quantum wires: restoring time-reversal symmetry by interaction.

Abstract: We investigate the transport of correlated fermions through a junction of three one-dimensional quantum wires pierced by a magnetic flux. We determine the flow of the conductance as a function of a low-energy cutoff in the entire parameter space. For attractive interactions and generic flux the fixed point with maximal asymmetry of the conductance is the stable one, as conjectured recently. For repulsive interactions and arbitrary flux we find a line of stable fixed points with vanishing conductance as well as stable fixed points with symmetric conductance $(4/9)({e}^{2}/h)$.