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arXiv · 1707.05024

Gate-tuned Aharonov-Bohm interference of surface states in a quasi-ballistic Dirac semimetal nanowire

Ben-Chuan Lin·Shuo Wang·Li-Xian Wang·Cai-Zhen Li·Jin-Guang Li·Dapeng Yu·Zhi-Min Liao
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Abstract

We report an observation of a topologically protected transport of surface carriers in a quasi-ballistic Cd3As2 nanowire.The nanowire is thin enough for the spin-textured surface carriers to form 1D subbands, demonstrating conductance oscillations with gate voltage even without magnetic field. The {\pi} phase-shift of Aharonov-Bohm oscillations can periodically appear or disappear by tuning gate voltage continuously. Such a {\pi} phase shift stemming from the Berry's phase demonstrates the topological nature of surface states.The topologically protected transport of the surface states is further revealed by four-terminal nonlocal measurements.

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Ben-Chuan Lin, Shuo Wang, Li-Xian Wang, Cai-Zhen Li, Jin-Guang Li, Dapeng Yu, Zhi-Min Liao. 2017-07-17. Gate-tuned Aharonov-Bohm interference of surface states in a quasi-ballistic Dirac semimetal nanowire. https://doi.org/10.1103/physrevb.95.235436

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