Localization and capacitance fluctuations in disordered Au nanojunctions

Bowman, Michael K.; Anaya, Armando; Korotkov, Andrei; Davidović, Dragomir

doi:10.1103/physrevb.69.205405

Cited by 10 publications

(22 citation statements)

References 32 publications

(80 reference statements)

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“…In junctions made by self-breaking, no evidence of metal clusters was found, which may indicate that these are better suited for molecular electronics studies . On the other hand, localization of electronic states in the leads is also discussed as a possible origin of Coulomb blockade effects and a zero-bias anomaly (Bowman et al, 2004). We have found experimental evidence for electrically disconnected grains occurring in nanocontacts formed by electromigration by studying the local electrostatic potential using scanning force microscopy (Arnold et al, 2017).…”

Section: Coulomb Blockadementioning

confidence: 86%

Electromigration and the structure of metallic nanocontacts

Hoffmann‐Vogel

2017

Applied Physics Reviews

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FIG. 5. STM set-up used in the literature for studying nanoscale metallic junctions with TEM. The set-up very much resembles a standard STM setup, except that this instrument is used under the electron beam of a TEM. Reprinted with permission from Ohnishi et al., Nature 395, 780 (1998). FIG. 6. (a) If microscopic and macroscopic effects are to be summarized in one picture, diffusion under the influence of electromigration forces can be understood as hopping in a tilted washboard-potential. (b) Energy landscape for a hopping atom with a definition of its energy parameters.

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Section: Coulomb Blockadementioning

confidence: 86%

Electromigration and the structure of metallic nanocontacts

Hoffmann‐Vogel

2017

Applied Physics Reviews

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“…We have explained the disorder by granularity and the grain size much smaller than the nanojunction dimensions. [9] In particular, the disorder could not be amorphous as Au did not alloy with the impurities that were present in sample fabrication (H 2 O or O 2 ). Our imaging resolution, however, was insufficient to determine the grain diameter.…”

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confidence: 99%

Suppression of Spin-Orbit Scattering in Strongly Disordered Gold Nanojunctions

Anaya¹,

Bowman²,

Davidovic³

2004

Phys. Rev. Lett.

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We discovered that spin-orbit scattering in strong-disordered gold nanojunctions is strongly suppressed relative to that in weak-disordered gold thin films. This property is unusual because in weak-disordered films, spin-orbit scattering increases with disorder. Granularity and freezing of spin-orbit scattering inside the grains explains the suppression of spin-orbit scattering. We propose a generalized Elliot-Yafet relation that applies to strong-disordered granular regime.The field of spintronics has recently emerged as a potential alternative to conventional charge-based electronics.[1] What sets spintronics apart is the explicit study or use of the electron spin degree of freedom. A challenge in spintronics is the finite lifetime of spin-polarized current, since electron spins can flip in normal metals and semiconductors.It is generally accepted that a spin-orbit (SO) interaction, through the so called Elliot-Yafet mechanism, [2,3] causes spin-flip scattering in weak-disordered metals. In this mechanism, the SO scattering time (τ ey so ) is proportional to the momentum relaxation time τ , τ ey so = τ /α, which is known as the Elliot-Yafet relation. The scattering ratio α ≪ 1 represents the spin-flip probability during the momentum relaxation time. It depends on the atomic number, band structure, and to a lesser extent, on sample preparation techniques. It has recently been demonstrated that the Elliot-Yafet relation agrees with measured SO scattering time in a wide range of weak-disordered metallic samples. [4] In this paper we investigate SO scattering in strongdisordered metals, that is, in metals where conduction electrons undergo transition into Anderson localized states at low temperatures. We find that the relation between disorder and SO scattering time in the strongdisordered regime is qualitatively different from that in the weak-disordered regime. We observe a strong enhancement of the SO scattering time compared to that in weak-disordered samples. We propose that the enhancement of the SO scattering time arises from granularity, as follows.Consider a 3D granular system composed of grains with average diameter D and average grain-to grain resistance R g . If R g is larger than R Q = h/e 2 = 25.8kΩ, within a factor of order one, then the system is strongdisordered. If R g < R Q , within a factor of order one, then the system is weak-disordered. [5] By definition, R g is larger than the resistance inside the grains. The dwell time of an electron on any given grain (t D ) is roughly t D = t H R g /R Q , where t H = h/δ is the Heisenberg time (δ is the level spacing).We consider small strong-disordered granular samples, in which the electron localization length is larger than sample size. In these samples, electrons at the Fermi level are spatially extended through the sample. We discuss SO scattering time of electrons at the Fermi level and at zero temperature. We assume the grains are ballistic so that momentum relaxation is dominated by surface scattering. So the Elliot-Yafet relation predicts a SO ...

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“…First, as gold is not a hard metal it can undergo surface self-diffusion [O'N07]. Particularly under electrical stress, the topmost surface atoms migrate towards zones of high fields and highest current densities [Bow04,Itt09]. As these spots are located at the tip apex, the sharpening result in even higher field concentrations.…”

Section: Subsequent I-v Curvesmentioning

confidence: 99%

Attosecond Electron Transport in Plasmonic Nanostructures

Leitenstorfer

Ludwig

Rybka

et al. 2018

Advanced Photonics 2018 (BGPP, IPR, NP, NOMA, Sensors, Networks, SPPCom, SOF)

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OPA optical parametric amplifier BEM boundary element method ATP above-threshold photoemission ATI above-threshold ionization RSD relative standard deviation FN Fowler-Nordheim 2DSI two-dimensional spectral shearing interferometry SMU source meter unit AFM atomic force microscope SEM scanning electron microscope EBL electron-beam lithography RMS root-mean-square BBO beta barium borate TBP time-bandwidth product CEP carrier-envelope phase CEO carrier-envelope offset SAM semiconductor saturable absorber mirror GDD group delay dispersion GVD group velocity dispersion SPM self-phase modulation XPM cross-phase modulation FWM four-wave mixing PPLN periodically poled lithium niobate SRS stimulated raman scattering DFG difference frequency generation iii Contents NLSE nonlinear Schroedinger equation ZDW zero-dispersion wavelength WDM wavelength-division multiplexing EDF erbium doped fiber EDFA erbium-doped fiber amplifier MFA mode field area MFD mode field diameter HNF highly nonlinear bulk silica fiber PCF photonic crystal fiber PM polarization-maintaining NPE nonlinear polarization evolution NALM nonlinear amplifying loop mirror FWHM full-width at half-maximum FROG frequency-resolved optical gating IMFP inelastic mean free path EMFP elastic mean free path I-V current-voltage iv 1. Introduction

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Localization and capacitance fluctuations in disordered Au nanojunctions

Cited by 10 publications

References 32 publications

Electromigration and the structure of metallic nanocontacts

Electromigration and the structure of metallic nanocontacts

Suppression of Spin-Orbit Scattering in Strongly Disordered Gold Nanojunctions

Attosecond Electron Transport in Plasmonic Nanostructures

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