Magnetotransport in atomic-size bismuth contacts

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2014
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Journal of Physics : Condensed Matter. 2014, 26(47), 474203. ISSN 0953-8984. eISSN 1361-648X. Available under: doi: 10.1088/0953-8984/26/47/474203
Zusammenfassung

We report low-temperature transport experiments on atomic-size contacts of bismuth that are fabricated using the mechanically controlled break-junction technique at low temperatures. We observe stable contacts with conductance values at fractions of one conductance quantum G0 = 2e2/h, as is expected for systems with long Fermi wavelength. We defer two preferred conductance scales: the lower one is in the order of 0.015 G0 and can be attributed to singleatom Bi contact, while the higher one amounts to 0.15 G0, as indicated by the appearance of multiples of this value in the conductance histogram. Rich magneto-transport behaviour with significant changes in the magneto-conductance is found in the whole conductance range. Although for the pristine samples and large contacts with G > 5 G0, indications for Shubnikov-de Haas oscillations are present, the smallest contacts show pronounced conductance fluctuations that decay rapidly when a magnetic field is applied. Moreover, large variations are observed when a finite bias voltage is applied. These findings are interpreted as the transition from the diffusive to the ballistic and the ultra-quantum regime when lowering the contact size.

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530 Physik
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bismuth, nanocontacts, atomic contacts, break junction, universal conductance fluctuations (UCF), Shubnikov-de Haas oscillations
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ISO 690PERNAU, Hans, Torsten PIETSCH, Elke SCHEER, 2014. Magnetotransport in atomic-size bismuth contacts. In: Journal of Physics : Condensed Matter. 2014, 26(47), 474203. ISSN 0953-8984. eISSN 1361-648X. Available under: doi: 10.1088/0953-8984/26/47/474203
BibTex
@article{Pernau2014Magne-29217,
  year={2014},
  doi={10.1088/0953-8984/26/47/474203},
  title={Magnetotransport in atomic-size bismuth contacts},
  url={http://iopscience.iop.org/0953-8984/26/47/474203/},
  number={47},
  volume={26},
  issn={0953-8984},
  journal={Journal of Physics : Condensed Matter},
  author={Pernau, Hans and Pietsch, Torsten and Scheer, Elke},
  note={We gratefully acknowledge financial support from the Krupp foundation and from the Baden-Württemberg-Stiftung in the framework of the Research Network Functional Nanostructures. Article Number: 474203}
}
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We gratefully acknowledge financial support from the Krupp foundation and from the Baden-Württemberg-Stiftung in the framework of the Research Network Functional Nanostructures.
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