Vibrationally Induced Two-Level Systems in Single-Molecule Junctions

Abstract

Single-molecule junctions are found to show anomalous spikes in dI/dV spectra. The position in energy of the spikes are related to local vibration mode energies. A model of vibrationally induced two-level systems reproduces the data very well. This mechanism is expected to be quite general for single-molecule junctions. It acts as an intrinsic amplification mechanism for local vibration mode features and may be exploited as a new spectroscopic tool.

4 pages, 4 figures

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• Quantum properties of atomic-sized conductors
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• Inelastic electron tunneling spectroscopy in molecular junctions: Peaks and dips
• 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
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Cited by in corpus (31)

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• Evidence for a single hydrogen molecule connected by an atomic chain
• Multimode vibrational effects in single molecule conductance: A nonequilibrium Green's function approach
• Transport through an Anderson impurity: Current ringing, non-linear magnetization and a direct comparison of continuous-time quantum Monte Carlo and hierarchical quantum master equations
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• Rotational Excitation Spectroscopy with the STM through Molecular Resonances
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• Effect of broadening in the weak coupling limit of vibrationally coupled electron transport through molecular junctions and the analogy to quantum dot circuit QED systems
• Transport through molecular junctions with a nonequilibrium phonon population
• Atomic Motion in Single H${}_2$ and D${}_2$ Molecule Junction Induced by Phonon Excitation
• Josephson-current induced conformational switching of a molecular quantum dot
• Vibrationally dependent electron-electron interactions in resonant electron transport through single-molecule junctions
• Charge-vibration interaction effects in normal-superconductor quantum dots
• Vibrationally induced flip motion of a hydroxyl dimer on Cu(110)
• Molecule-assisted ferromagnetic atomic chain formation
• Nonequilibrium electron-vibration coupling and conductance fluctuations in a C60-junction
• Picocavity-Enhanced Raman Spectroscopy of Physisorbed H${}_2$ and D${}_2$ Molecules
• On the Accuracy of the Noninteracting Electron Approximation for Vibrationally Coupled Electron Transport
• Effects of coupling to vibrational modes on the ac conductance of molecular junctions
• Inelastic Current Noise in Nanoscale Systems: Scattering Theory Analysis
• Local excitation of kagome spin ice magnetism in HoAgGe seen by scanning tunneling microscopy
• Current shot noise in atomic contacts: Fe and FeH${}_2$ between Au electrodes
• Critical Josephson current through a bistable single-molecule junction
• Theory of vibrationally assisted tunneling for hydroxyl monomer flipping on Cu(110)