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Fano Interference between Bulk and Surface States of a Dirac Semimetal Cd_{3}As_{2} Nanowire
Shuo Wang1, Ben-Chuan Lin1, Wen-Zhuang Zheng1
1State Key Laboratory for Mesoscopic Physics, School of Physics, Peking University, Beijing 100871, China.
Abstract:
Dirac semimetals possess Fermi-arc surface states, which will be a set of discrete surface subbands in a nanowire due to the quantum confinement effect. Here, we report a tunable Fano effect induced by the interference between the discrete surface states and continuous bulk states of a Dirac semimetal Cd_{3}As_{2} nanowire. The discrete surface bands lead to a zero bias peak in conductance as the Femi level is tuned to across the surface subbands. The Fano resonance results in an asymmetric line shape in the differential conductance dI/dV spectrum. Furthermore, the Fano interference would introduce an additional phase into the Weyl orbits and lead to a modification of the oscillation frequency. The results are valuable for further understanding the exotic quantum transport properties of topological semimetals.
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