Abstract
Zero-bias anomalies in topological nanowires have recently captured significant attention, as they are possible signatures of Majorana modes. Yet there are many other possible origins of zero-bias peaks in nanowires—for example, weak localization, Andreev bound states, or the Kondo effect. Here, we discuss observations of differential-conductance peaks at zero-bias voltage in non-superconducting electronic transport through a 3D topological insulator (Bi1.33Sb0.67)Se3 nanowire. The zero-bias conductance peaks show logarithmic temperature dependence and often linear splitting with magnetic fields, both of which are signatures of the Kondo effect in quantum dots. We characterize the zero-bias peaks and discuss their origin.
Highlights
To understand the origin of the zero-bias conductance peaks, we have performed the transport measurements at different magnetic fields
The formation of zero-bias peaks and the splitting of the peaks with a magnetic field are reminiscent of the Kondo effect in quantum dots
We find that the overall background conductance values in our experiments are relatively high (3e2/h < G < 5e2/h) compared to the conductance values (G < 2e2/h) previously reported in quantum dots showing the Kondo effect[35,36], and that our topological insulator nanowire device behaves as an open quantum dot
Summary
To understand the origin of the zero-bias conductance peaks, we have performed the transport measurements at different magnetic fields. The formation of zero-bias peaks and the splitting of the peaks with a magnetic field are reminiscent of the Kondo effect in quantum dots. Kondo effect in quantum splitting), where μ B is the dots is that the zero-bias peak splits with magnetic field Bohr magneton.
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