Huge negative differential conductance in Au-H2 molecular nanojunctions

Abstract

Experimental results showing huge negative differential conductance in gold-hydrogen molecular nanojunctions are presented. The results are analyzed in terms of two-level system (TLS) models: it is shown that a simple TLS model cannot produce peaklike structures in the differential conductance curves, whereas an asymmetrically coupled TLS model gives perfect fit to the data. Our analysis implies that the excitation of a bound molecule to a large number of energetically similar loosely bound states is responsible for the peaklike structures. Recent experimental studies showing related features are discussed within the framework of our model.

9 pages, 8 figures

References in corpus (10)

• Quantum properties of atomic-sized conductors
• Measurement of the conductance of a hydrogen molecule
• Modeling inelastic phonon scattering in atomic- and molecular-wire junctions
• Stretching dependence of the vibration modes of a single-molecule Pt-H2-Pt bridge
• Conductance fluctuations as a tool for investigating the quantum modes in atomic size metallic contacts
• Evidence for saturation of channel transmission from conductance fluctuations in atomic-size point contacts
• Universal features of electron-phonon interactions in atomic wires
• Vibrationally Induced Two-Level Systems in Single-Molecule Junctions
• Conduction Mechanism in a Molecular Hydrogen Contact
• Slow two-level systems in point contacts

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• Vibrationally induced flip motion of a hydroxyl dimer on Cu(110)
• Nonequilibrium electron-vibration coupling and conductance fluctuations in a C60-junction
• Temporal correlations and structural memory effects in break junction measurements
• Picocavity-Enhanced Raman Spectroscopy of Physisorbed H${}_2$ and D${}_2$ Molecules
• Alternative types of molecule-decorated atomic chains in Au-CO-Au single-molecule junctions
• Non-equilibrium boundary driven quantum systems: models, methods and properties
• Nanomechanics of a Hydrogen Molecule Suspended between Two Equally Charged Tips