Germanene nanomeshes:Cooperative effects of degenerate perturbation and uniaxial strain on tuning bandgap

doi:10.1088/1674-1056/26/10/108101

Abstract

Based on the detailed first-principles calculations, we have carefully investigated the defect induced band splitting and its combination with Dirac cone move in bandgap opening. The uniaxial strain can split the π -like bands into π_a and π_z bands with energy interval E_strain to shift the Dirac cone. Also, the inversion symmetry preserved antidot can split π_a (π_z) into π_a1 and π_a2 (π_z1 and π_z2) bands with energy interval E_defect to open bandgap in the nanomesh with Γ as four-fold degenerate Dirac point according to the band-folding analysis. Though the E_defect would keep almost unaffected, the E_strain would be increased by enhancing the uniaxial strain to continuously tune the gap width. Then the bandgap can be reversibly switched on/off. Our studies of the inversion symmetry preserved nanomesh show distinct difference in bandgap opening mechanism as compared to the one by breaking the sublattice equivalence in the (GaAs)₆ nanoflake patterned nanomesh. Here, the π-band gap remains almost unchanged against strain enhancing.

Keywords: first-principles calculation novel two-dimensional nanostructure bandgap engineering

Received: 27 May 2017
Revised: 30 June 2017
Accepted manuscript online:

PACS:	81.05.Zx	(New materials: theory, design, and fabrication)
	81.05.Rm	(Porous materials; granular materials)
	81.05.ue	(Graphene)

Fund:

Project supported by the National Natural Science Foundation of China (Grant Nos. 11374128 and 11674129) and partially supported by the Science and Technology Program of University of Jinan (Grant No. XKY1705).

Corresponding Authors: Xinyu Fan
E-mail: xyfan_ujn@163.com

Cite this article:

Yan Su(苏燕), Xinyu Fan(范新宇) Germanene nanomeshes:Cooperative effects of degenerate perturbation and uniaxial strain on tuning bandgap 2017 Chin. Phys. B 26 108101

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Germanene nanomeshes:Cooperative effects of degenerate perturbation and uniaxial strain on tuning bandgap

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