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One of the unique features of Dirac Fermions is pseudo-diffusive transport byevanescent modes at low Fermi energies when the disorder is low. At higherFermi energies i.e. carrier densities, the electrical transport is diffusive innature and the propagation occurs via plane-waves. In this study, we report thedetection of such evanescent modes in the surface states of topologicalinsulator through 1/f noise. While signatures of pseudo-diffusive transporthave been seen experimentally in graphene, such behavior is yet to be observedexplicitly in any other system with a Dirac dispersion. To probe this, we havestudied 1/f noise in topological insulators as a function of gate-voltage, andtemperature. Our results show a non-monotonic behavior in 1=f noise as theFermi energy is varied, suggesting a crossover from pseudo-diffusive todiffusive transport regime in mesoscopic topological insulators. Thetemperature dependence of noise points towards conductance fluctuations fromquantum interference as the dominant source of the noise in these samples.

Signature of pseudo-diffusive transport in mesoscopic topological insulators