Strain-induced phase transition and electron spin-polarization in graphene spirals.

Abstract:

:Spin-polarized triangular graphene nanoflakes (t-GNFs) serve as ideal building blocks for the long-desired ferromagnetic graphene superlattices, but they are always assembled to planar structures which reduce its mechanical properties. Here, by joining t-GNFs in a spiral way, we propose one-dimensional graphene spirals (GSs) with superior mechanical properties and tunable electronic structures. We demonstrate theoretically the unique features of electron motion in the spiral lattice by means of first-principles calculations combined with a simple Hubbard model. Within a linear elastic deformation range, the GSs are nonmagnetic metals. When the axial tensile strain exceeds an ultimate strain, however, they convert to magnetic semiconductors with stable ferromagnetic ordering along the edges. Such strain-induced phase transition and tunable electron spin-polarization revealed in the GSs open a new avenue for spintronics devices.

journal_name

Sci Rep

journal_title

Scientific reports

authors

Zhang X,Zhao M

doi

10.1038/srep05699

subject

Has Abstract

pub_date

2014-07-16 00:00:00

pages

5699

issn

2045-2322

pii

srep05699

journal_volume

4

pub_type

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