Step-Edge Anomaly in Topological Metals
The paper investigates how topological matter exhibits robust, anomalous conductance at step edges when a surface is shifted by an integer number of unit cells. It predicts a step-edge conductance ($G_{se}$) dependent on bulk topology ($K$) and the step height ($ u$), showing non-integer quantization. This anomaly arises from a combination of quantized chiral modes at the edge and non-quantized bulk contributions.