Magnetic-flux-driven topological quantum phase transition and manipulation of perfect edge states in graphene tube.

Abstract:

:We study the tight-binding model for a graphene tube with perimeter N threaded by a magnetic field. We show exactly that this model has different nontrivial topological phases as the flux changes. The winding number, as an indicator of topological quantum phase transition (QPT) fixes at N/3 if N/3 equals to its integer part [N/3], otherwise it jumps between [N/3] and [N/3] + 1 periodically as the flux varies a flux quantum. For an open tube with zigzag boundary condition, exact edge states are obtained. There exist two perfect midgap edge states, in which the particle is completely located at the boundary, even for a tube with finite length. The threading flux can be employed to control the quantum states: transferring the perfect edge state from one end to the other, or generating maximal entanglement between them.

journal_name

Sci Rep

journal_title

Scientific reports

authors

Lin S,Zhang G,Li C,Song Z

doi

10.1038/srep31953

subject

Has Abstract

pub_date

2016-08-24 00:00:00

pages

31953

issn

2045-2322

pii

srep31953

journal_volume

6

pub_type

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