Voltage fluctuations in mesoscopic structures of bismuth

The resistance fluctuations with magnetic field in mesoscopic wires of bismuth have been investigated. The wires show conductance fluctuations (dG) and antilocalization effects, and show voltage fluctuations in Hall measurements at 4.2K and 1.5K. It is found that in the strong spin-orbit coupling case, the dG are reduced by 1 ∼ 2 order, and when the length of wire (L) shorter than the coherence length (Li), the voltage fluctuations are constant, and the conductance fluctuations are not universal and will diverge as dG=(e2/h)LiLt/L2 when the thermal length (Lt) is also shorter than Li.