Mechanical Properties and Formation Mechanisms of a Wire of Single Gold Atoms

Rubio‐Bollinger, Gabino; Bahn, Sune Rastad; Agraı̈t, Nicolás; Jacobsen, Karsten Wedel; Vieira, S.

doi:10.1103/physrevlett.87.026101

Cited by 398 publications

(503 citation statements)

References 24 publications

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“…The conductance as a function of the Au atom chain length in individual pulls shows steps which are of the order of 0.1 G 0 , i.e., remarkably larger than the oscillations in our results for the Au chains with constant interatomic distances. Similar steps were recorded earlier by Rubio-Bollinger et al 22 Furthermore, Smit et al concluded that the maxima ͑minima͒ in the conductance correspond to an odd ͑even͒ number of atoms in the chain. This is also in contrast to our results in Fig.…”

Section: Electron Transport Through Monovalent Atomic Wiressupporting

confidence: 67%

Electron transport through monovalent atomic wires

et al. 2004

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Section: Electron Transport Through Monovalent Atomic Wiressupporting

confidence: 67%

Electron transport through monovalent atomic wires

et al. 2004

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“…The way ∆t 5 is obtained is similar to that used to measure experimental plateau lengths distributions [22]. However, we have found that this quantity does not reflect the actual maximum length of the icosahedral nanowires L m p .…”

Section: Resultsmentioning

confidence: 72%

Identification and characterization of icosahedral metallic nanowires

Peláez

Guerrero

Paredes

et al. 2009

Phys. Status Solidi (c)

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We present and discuss an algorithm to identify and characterize the long icosahedral structures (staggered pentagonal nanowires with 1-5-1-5 atomic structure) that appear in Molecular Dynamics simulations of metallic nanowires of different species subjected to stretching. The use of the algorithm allows the identification of pentagonal rings forming the icosahedral structure as well as the determination of its number np, and the maximum length of the pentagonal nanowire L m p . The algorithm is tested with some ideal structures to show its ability to discriminate between pentagonal rings and other ring structures. We applied the algorithm to Ni nanowires with temperatures ranging between 4K and 865K, stretched along the [100] direction. We studied statistically the formation of pentagonal nanowires obtaining the distributions of length L m p and number of rings np as function of the temperature. The L m p distribution presents a peaked shape, with peaks locate at fixes distances whose separa-tion corresponds to the distance between two consecutive pentagonal rings.

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“…However, we note that the resulting thermal stresses can be of similar order of magnitude as the tensile film stress resulting in large uncertainties in this estimation. Nevertheless, this stiffness is clearly below the one of Au-Au contacts (~1.5 N/m) 6 and therefore not suitable for achieving a controlled breaking process. Instead it supports our observation of abrupt breaking from large contacts (GEL > 10 G0) to tunnelling during retraction of the tip.…”

Section: Stiffness Estimation Of the Mems Devicementioning

confidence: 89%

Heat transport through atomic contacts

et al. 2017

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Metallic atomic junctions pose the ultimate limit to the scaling of electrical contacts 1 . They serve as model systems to probe electrical and thermal transport down to the atomic level as well as quantum effects occurring in one-dimensional systems 2 . Charge transport in atomic junctions has been studied intensively in the last two decades 2,3,4,5 . However, heat transport remains poorly characterized because of significant experimental challenges. Specifically the combination of high sensitivity to small heat fluxes and the formation of stable atomic contacts has been a major hurdle for the development of this field. Here we report on the realization of heat transfer measurements through atomic junctions and analyze the thermal conductance of single atomic gold contacts at room temperature. Simultaneous measurements of charge and heat transport reveal the proportionality of electrical and thermal conductance, quantized with the respective conductance quanta 6 . This constitutes an atomic scale verification of the well-known Wiedemann-Franz law 7 . We anticipate that our findings will be a major advance in enabling the investigation of heat transport properties in molecular junctions, with meaningful implications towards the manipulation of heat at the nanoscale. IntroductionHeat transport and dissipation at the nanoscale has spurred research interest as it severely limits scaling of high performance electronic devices and circuits 8 . Atomic quantum point contacts represent an ideal platform to investigating heat transport in which quantum confinement effects cannot be neglected. The development of experimental techniques, such as scanning tunneling microscopy (STM) and mechanically controlled break junction (MCBJ) enabled the formation and manipulation of monoatomic metallic chains 3,4,5 . Using these techniques, charge transport in atomic junctions has been studied intensively 2,3,4,5 , and, more recently, Joule dissipation 9,10 and thermoelectric effects 11,12 have been successfully probed. Recently, heat dissipation was measured in current-carrying single gold-gold contacts by means of STM with an integrated micro thermocouple in the tip 9 . It was shown that heat dissipates symmetrically into the two contacts, confirming that the electron transmission function T(E) of the junction element around the Fermi energy of the metallic contacts governs this phenomenon. Despite these recent steps forward, the properties of heat conduction through atomic junctions still remain to be fully explored.Electrical conductance in atomic junctions is quantized. A single gold atom contact has a conductance equal to the quantum G0 = 2e 2 /h, where e is the electron charge and h Planck's constant. The Landauer approach used to describe charge transport can also be applied to predict heat transport 13 and predicts the validity of the Wiedemann-Franz (WF) law, which states that the thermal conductance GTH and the electrical conductance GEL are proportional to each other,where T is the absolute temperature and the proportio...

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Mechanical Properties and Formation Mechanisms of a Wire of Single Gold Atoms

Cited by 398 publications

References 24 publications

Electron transport through monovalent atomic wires

Electron transport through monovalent atomic wires

Identification and characterization of icosahedral metallic nanowires

Heat transport through atomic contacts

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