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

Gate-tuned Aharonov-Bohm interference of surface states in a quasiballistic Dirac semimetal nanowire 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 stemming from the Berry phase demonstrates the topological nature of surface states. The topologically protected transport of the surface states is further revealed by four-terminal nonlocal measurements. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Physical Review B American Physical Society (APS)

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

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

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 stemming from the Berry 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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Publisher
American Physical Society (APS)
Copyright
Copyright © ©2017 American Physical Society
ISSN
1098-0121
eISSN
1550-235X
D.O.I.
10.1103/PhysRevB.95.235436
Publisher site
See Article on Publisher Site

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 stemming from the Berry phase demonstrates the topological nature of surface states. The topologically protected transport of the surface states is further revealed by four-terminal nonlocal measurements.

Journal

Physical Review BAmerican Physical Society (APS)

Published: Jun 28, 2017

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