title: Aharonov-Bohm oscillations in a quasi-ballistic three-dimensional topological insulator nanowire.
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 (Bi1.33Sb0.67)Se3 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.
authors.affiliation: Department of Physics and Frederick Seitz Materials Research Laboratory, University of Illinois, 104 South Goodwin Avenue, Urbana, Illinois 61801, USA.
authors.forename: Sungjae
authors.initials: S
authors.lastname: Cho
authors.affiliation: Department of Electrical and Computer Engineering and Micro and Nanotechnology Laboratory, University of Illinois, 208 N. Wright St, Urbana, Illinois 61801, USA.
authors.forename: Brian
authors.initials: B
authors.lastname: Dellabetta
authors.affiliation: Condensed Matter Physics and Materials Science Department, Brookhaven National Laboratory, Upton, New York 11973, USA.
authors.forename: Ruidan
authors.initials: R
authors.lastname: Zhong
authors.affiliation: Condensed Matter Physics and Materials Science Department, Brookhaven National Laboratory, Upton, New York 11973, USA.
authors.forename: John
authors.initials: J
authors.lastname: Schneeloch
authors.affiliation: Condensed Matter Physics and Materials Science Department, Brookhaven National Laboratory, Upton, New York 11973, USA.
authors.forename: Tiansheng
authors.initials: T
authors.lastname: Liu
authors.affiliation: Condensed Matter Physics and Materials Science Department, Brookhaven National Laboratory, Upton, New York 11973, USA.
authors.forename: Genda
authors.initials: G
authors.lastname: Gu
authors.affiliation: Department of Electrical and Computer Engineering and Micro and Nanotechnology Laboratory, University of Illinois, 208 N. Wright St, Urbana, Illinois 61801, USA.
authors.forename: Matthew J
authors.initials: MJ
authors.lastname: Gilbert
authors.affiliation: Department of Physics and Frederick Seitz Materials Research Laboratory, University of Illinois, 104 South Goodwin Avenue, Urbana, Illinois 61801, USA.
authors.forename: Nadya
authors.initials: N
authors.lastname: Mason