Quantitative mapping of fast voltage pulses in tunnel junctions by plasmonic luminescence

Große, Christoph; Etzkorn, Markus; Kuhnke, Klaus; Loth, Sebastian; Kern, Klaus

doi:10.1063/1.4827556

Cited by 27 publications

(51 citation statements)

References 23 publications

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“…Due to nanometer size of the junction, we use a classical picture where the inelastic tunneling current is represented as a point electric dipole p placed in the junction and radiating at the transition frequency ω. The dipole amplitude is given by the transition matrix elements [13,[15][16][17][18]20,[22][23][24][25]46] or, according to recent theory, by the corresponding spectral components of the quantum noise [47]. This dipole p is located above the NP surface at position r d which is typically set at the middle of the junction, and is oriented along the direction of the tunneling current, i.e., parallel to the tip axis (z axis) when the tip is on the horizontal upper NP face.…”

Section: Resultsmentioning

confidence: 99%

Engineering the emission of light from a scanning tunneling microscope using the plasmonic modes of a nanoparticle

et al. 2016

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The inelastic tunnel current in the junction formed between the tip of a scanning tunneling microscope (STM) and the sample can electrically generate optical signals. This phenomenon is potentially of great importance for nano-optoelectronic devices. In practice, however, the properties of the emitted light are difficult to control because of the strong influence of the STM tip. In this work, we show both theoretically and experimentally that the sought-after, well-controlled emission of light from an STM tunnel junction may be achieved using a nonplasmonic STM tip and a plasmonic nanoparticle on a transparent substrate. We demonstrate that the native plasmon modes of the nanoparticle may be used to engineer the light emitted in the substrate. Both the angular distribution and intensity of the emitted light may be varied in a predictable way by choosing the excitation position of the STM tip on the particle.

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Section: Resultsmentioning

confidence: 99%

Engineering the emission of light from a scanning tunneling microscope using the plasmonic modes of a nanoparticle

et al. 2016

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“…Since the advent of SPM, many other spectroscopy methods have been employed to locally resolve, for example, the apparent barrier height by measuring the current decay versus tipsample separation (124) or to determine lifetimes of excitations by pump-probe methods (125)(126)(127). Here, noncontact AFM, with its access to the forces acting between the tip and the sample, dramatically extends the spectroscopic possibilities: The atomic scale interaction potentials are measured directly (5, 128) when force-distance curves are integrated; local Kelvin probe force spectroscopy is performed, or surface charges are directly mapped (117), when the interacting forces are minimized with an applied bias.…”

Section: Investigating Electronic and Mechanical Properties Of Moleculesmentioning

confidence: 99%

Mass Spectrometry as a Preparative Tool for the Surface Science of Large Molecules

Rauschenbach

Ternes

Harnau

et al. 2016

Annual Rev. Anal. Chem.

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Measuring and understanding the complexity that arises when nanostructures interact with their environment are one of the major current challenges of nanoscale science and technology. High-resolution microscopy methods such as scanning probe microscopy have the capacity to investigate nanoscale systems with ultimate precision, for which, however, atomic scale precise preparation methods of surface science are a necessity. Preparative mass spectrometry (pMS), defined as the controlled deposition of m/z filtered ion beams, with soft ionization sources links the world of large, biological molecules and surface science, enabling atomic scale chemical control of molecular deposition in ultrahigh vacuum (UHV). Here we explore the application of high-resolution scanning probe microscopy and spectroscopy to the characterization of structure and properties of large molecules. We introduce the fundamental principles of the combined experiments electrospray ion beam deposition and scanning tunneling microscopy. Examples for the deposition and investigation of single particles, for layer and film growth, and for the investigation of electronic properties of individual nonvolatile molecules show that state-of-the-art pMS technology provides a platform analog to thermal evaporation in conventional molecular beam epitaxy. Additionally, it offers additional, unique features due to the use of charged polyatomic particles. This new field is an enormous sandbox for novel molecular materials research and demands the development of advanced molecular ion beam technology.

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“…Notably, by assuming = 1 meV (a realistic value for a molecule physisorbed on a surface) we can estimate t to be 26 ns for g = 4 and about an order of magnitude smaller if g = 3, with a current of the order of 1 nA. Since nanosecond resolution has been recently achieved in pump-probe spSTM experiments [29][30][31][32], a verification of our proposed vibroninduced spin relaxation at hybrid interfaces is possible.…”

Section: Transport and Experimental Implicationsmentioning

confidence: 83%

“…This consists in performing time-resolved spin-polarized scanning tunneling microscopy (spSTM) experiments which probe well-defined molecules on a substrate. We will show that the required time resolution is indeed achievable with this technique [29][30][31][32]. The article is organized as follows: First, we introduce the proposed model and we describe the employed theoretical methods (Sec.…”

Section: Introductionmentioning

confidence: 99%

Vibron-assisted spin relaxation at a metal/organic interface

et al. 2015

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Inspired by recent experiments for hybrid organic-ferromagnet interfaces, we propose a spin-relaxation mechanism which does not depend on either the spin-orbit or the hyperfine interaction. This takes place when a molecule with initial spin imbalance is weakly coupled to a metal surface and can be excited in various vibrational states. In such a situation the electron-vibron interaction promotes the exchange of spin-polarized electrons between the molecule and the surface, serving as an energy and angular momentum reservoir. This process leads to an effective spin relaxation of the electron population in the molecule. We suggest that this nonequilibrium mechanism can be investigated through time-resolved spin-polarized scanning tunneling microscopy experiments.

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Quantitative mapping of fast voltage pulses in tunnel junctions by plasmonic luminescence

Abstract: Electric double layer effect on observable characteristics of the tunnel current through a bridged electrochemical contact

Cited by 27 publications

References 23 publications

Engineering the emission of light from a scanning tunneling microscope using the plasmonic modes of a nanoparticle

Engineering the emission of light from a scanning tunneling microscope using the plasmonic modes of a nanoparticle

Mass Spectrometry as a Preparative Tool for the Surface Science of Large Molecules

Vibron-assisted spin relaxation at a metal/organic interface

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