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Bismuth is a candidate material for three dimensional higher dimensionaltopological insulators. We performed electronic transport experiments on smalldiameter crystalline bismuth nanowires to clarify the role of the proposedhinge channels in the interlayer coupling. The magnetoresistance presents asequence of peaks at Yamaji magic angles for which the interlayer groupvelocity is zero pointing to flat bands due to the layered structure.Furthermore, we observe a peak for high magnetic fields applied parallel to thelayers, a definitive signature of interlayer coherence that enables deductionof the interlayer transfer integral of 8 meV. We demonstrate transport by acorrugated open Fermi surface of holes that is extended, with the high angularprecision of around 0.016 rad in the interlayer direction. The observationsindicate that coherence and the crystallographic direction set by hinges play akey role in the interlayer coupling of bismuth.

Observation of open Fermi surface in bismuth