Gate-tuned Aharonov-Bohm interference of surface states in a quasiballistic Dirac semimetal nanowire
POSTER
Abstract
We report an observation of a topologically protected transport of surface carriers in a quasiballistic 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 π-phase shift of Aharonov-Bohm
oscillations can periodically appear/disappear by tuning gate voltage continuously. Such a π-phase shift stems
from the magnetic field induced helical modes in the surface subbands.
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 π-phase shift of Aharonov-Bohm
oscillations can periodically appear/disappear by tuning gate voltage continuously. Such a π-phase shift stems
from the magnetic field induced helical modes in the surface subbands.
*This work was supported by National Key Research and De-velopment Program of China (Grants No. 2016YFA0300802,
No. 2013CB934600, and No. 2013CB932602) and NSFC
(Grants No. 11274014 and No. 11234001)
Presenters
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Benchuan Lin
- Peking University