Shot noise variation within ensembles of gold atomic break junctions at room temperature

Chen, Ruoyu; Matt, Manuel; Pauly, Fabian; Nielaba, Peter; Cuevas, Juan Carlos; Natelson, Douglas

Shot noise variation within ensembles of gold atomic break junctions at room temperature

Dateien

Chen_0-259235.pdfGröße: 1.81 MBDownloads: 260

Datum

2014

Autor:innen

Chen, Ruoyu

Natelson, Douglas

Open Access-Veröffentlichung

Open Access Green

Sammlungen

Physik

Publikationstyp

Zeitschriftenartikel

Publikationsstatus

Published

Erschienen in

Journal of Physics : Condensed Matter. 2014, 26(47), 474204. ISSN 0953-8984. eISSN 1361-648X. Available under: doi: 10.1088/0953-8984/26/47/474204

Zusammenfassung

Atomic-scale junctions are a powerful tool to study quantum transport, and are frequently examined through the mechanically controllable break junction technique. The junction-to-junction variation of atomic configurations often leads to a statistical approach, with ensemble-averaged properties providing access to the relevant physics. However, the full ensemble contains considerable additional information. We report a new analysis of shot noise over entire ensembles of junction configurations using scanning tunneling microscope-style gold break junctions at room temperature in ambient conditions, and compare these data with simulations based on molecular dynamics, a sophisticated tight-binding model, and nonequilibrium Green's functions. The experimental data show a suppression in the variation of the noise near conductances dominated by fully transmitting channels, and a surprising participation of multiple channels in the nominal tunneling regime. Comparison with the simulations, which agree well with published work at low temperatures and ultrahigh vacuum conditions, suggests that these effects likely result from surface contamination and disorder in the electrodes. We propose additional experiments that can distinguish the relative contributions of these factors.

Fachgebiet (DDC)

530 Physik

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ISO 690

CHEN, Ruoyu, Manuel MATT, Fabian PAULY, Peter NIELABA, Juan Carlos CUEVAS, Douglas NATELSON, 2014. Shot noise variation within ensembles of gold atomic break junctions at room temperature. In: Journal of Physics : Condensed Matter. 2014, 26(47), 474204. ISSN 0953-8984. eISSN 1361-648X. Available under: doi: 10.1088/0953-8984/26/47/474204

BibTex

@article{Chen2014noise-29253,
  year={2014},
  doi={10.1088/0953-8984/26/47/474204},
  title={Shot noise variation within ensembles of gold atomic break junctions at room temperature},
  number={47},
  volume={26},
  issn={0953-8984},
  journal={Journal of Physics : Condensed Matter},
  author={Chen, Ruoyu and Matt, Manuel and Pauly, Fabian and Nielaba, Peter and Cuevas, Juan Carlos and Natelson, Douglas},
  note={Article Number: 474204}
}

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