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Quantum Conductance in Semimetallic Bismuth Nanocontacts

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arxiv cond-mat/0205122 v1 pith:XJFU33ZP submitted 2002-05-07 cond-mat.mes-hall cond-mat.mtrl-sci

Quantum Conductance in Semimetallic Bismuth Nanocontacts

J. G. Rodrigo , A. Garcia-Martin , J.J. Saenz , S. Vieira This is my paper
classification cond-mat.mes-hall cond-mat.mtrl-sci
keywords conductancecontactbismuthcurveselongationnanocontactsquantumanalyzed
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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Electronic transport properties of bismuth nanocontacts are analyzed by means of a low temperature scanning tunneling microscope. The subquantum steps observed in the conductance versus elongation curves give evidence of atomic rearrangements in the contact. The underlying quantum nature of the conductance reveals itself through peaks in the conductance histograms. The shape of the conductance curves at 77 K is well described by a simple gliding mechanism for the contact evolution during elongation. The strikingly different behaviour at 4 K suggests a charge carrier transition from light to heavy ones as the contact cross section becomes sufficiently small.

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