Magnetotransport in atomic-size bismuth contacts

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PERNAU, Hans-Fridtjof, Torsten PIETSCH, Elke SCHEER, 2014. Magnetotransport in atomic-size bismuth contacts. In: Journal of Physics : Condensed Matter. 26(47), 474203. ISSN 0953-8984. eISSN 1361-648X. Available under: doi: 10.1088/0953-8984/26/47/474203

@article{Pernau2014Magne-29217, title={Magnetotransport in atomic-size bismuth contacts}, url={}, year={2014}, doi={10.1088/0953-8984/26/47/474203}, number={47}, volume={26}, issn={0953-8984}, journal={Journal of Physics : Condensed Matter}, author={Pernau, Hans-Fridtjof 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} }

Magnetotransport in atomic-size bismuth contacts 2014-11-04T13:55:44Z Pietsch, Torsten Pietsch, Torsten Scheer, Elke 2014-11-04T13:55:44Z eng Pernau, Hans-Fridtjof Attribution 3.0 Unported 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 G<sub>0</sub> = 2e<sup>2</sup>/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 G<sub>0</sub> and can be attributed to singleatom Bi contact, while the higher one amounts to 0.15 G<sub>0</sub>, 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 G<sub>0</sub>, 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. 2014 Scheer, Elke Pernau, Hans-Fridtjof

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