Aharonov-Bohm oscillations in a quasi-ballistic three-dimensional topological insulator nanowire

Sungjae Cho, Brian Dellabetta, Ruidan Zhong, John Schneeloch, Tiansheng Liu, Genda Gu, Matthew J. Gilbert, Nadya Mason

Research output: Contribution to journalArticle

Abstract

Aharonov-Bohm oscillations effectively demonstrate coherent, ballistic transport in mesoscopic rings and tubes. In three-dimensional topological insulator nanowires, they can be used to not only characterize surface states but also to test predictions of unique topological behaviour. Here we report measurements of Aharonov-Bohm oscillations in (Bi 1.33 Sb 0.67)Se 3 that demonstrate salient features of topological nanowires. By fabricating quasi-ballistic three-dimensional topological insulator nanowire devices that are gate-tunable through the Dirac point, we are able to observe alternations of conductance maxima and minima with gate voltage. Near the Dirac point, we observe conductance minima for zero magnetic flux through the nanowire and corresponding maxima (having magnitudes of almost a conductance quantum) at magnetic flux equal to half a flux quantum; this is consistent with the presence of a low-energy topological mode. The observation of this mode is a necessary step towards utilizing topological properties at the nanoscale in post-CMOS applications.

Original languageEnglish (US)
Article number8634
JournalNature communications
Volume6
DOIs
StatePublished - Jul 9 2015

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Nanowires
Ballistics
ballistics
nanowires
insulators
oscillations
Magnetic flux
magnetic flux
alternations
Surface states
CMOS
Observation
Fluxes
tubes
Equipment and Supplies
rings
Electric potential
electric potential
predictions
energy

ASJC Scopus subject areas

  • Chemistry(all)
  • Biochemistry, Genetics and Molecular Biology(all)
  • Physics and Astronomy(all)

Cite this

Aharonov-Bohm oscillations in a quasi-ballistic three-dimensional topological insulator nanowire. / Cho, Sungjae; Dellabetta, Brian; Zhong, Ruidan; Schneeloch, John; Liu, Tiansheng; Gu, Genda; Gilbert, Matthew J.; Mason, Nadya.

In: Nature communications, Vol. 6, 8634, 09.07.2015.

Research output: Contribution to journalArticle

Cho, Sungjae ; Dellabetta, Brian ; Zhong, Ruidan ; Schneeloch, John ; Liu, Tiansheng ; Gu, Genda ; Gilbert, Matthew J. ; Mason, Nadya. / Aharonov-Bohm oscillations in a quasi-ballistic three-dimensional topological insulator nanowire. In: Nature communications. 2015 ; Vol. 6.
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