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Beyond graphene: stable elemental monolayers of silicene and germanene.

Roome, NJ and Carey, JD (2014) Beyond graphene: stable elemental monolayers of silicene and germanene. ACS Appl Mater Interfaces, 6 (10). pp. 7743-7750.

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Abstract

Two-dimensional materials are one of the most active areas of nanomaterials research. Here we report the structural stability, electronic and vibrational properties of different monolayer configurations of the group IV elemental materials silicene and germanene. The structure of the stable configuration is calculated and for planar and low (<1 Å) atomic buckling configurations, analysis of the electronic band structure reveals linear band dispersion giving rise to massless Dirac Fermions with a Fermi velocity about two-thirds that of graphene. Monolayer stability is shown to be directly attributed to the phonons present with the instability being driven by the out-of-plane ZA and ZO phonon modes. Long momentum relaxation lengths and high carrier mobilities are predicted for silicene and germanene based devices as carrier relaxation via phonon scattering is found to be inhibited as the electron-optical phonon coupling matrix elements are calculated to be small, being about a factor of 25 times smaller than in graphene. The consequences for phonon scattering, high energy electrical transport and integration of elemental monolayers into electronic devices are further discussed.

Item Type: Article
Divisions : Faculty of Engineering and Physical Sciences > Electronic Engineering > Advanced Technology Institute
Authors :
AuthorsEmailORCID
Roome, NJUNSPECIFIEDUNSPECIFIED
Carey, JDUNSPECIFIEDUNSPECIFIED
Date : 28 May 2014
Identification Number : 10.1021/am501022x
Related URLs :
Additional Information : Copyright 2014 American Chemical Society. This document is the Accepted Manuscript version of a Published Work that appeared in final form in ACS Appl Mater Interfaces, copyright © American Chemical Society after peer review and technical editing by the publisher.To access the final edited and published work see http://dx.doi.org/10.1021/am501022x.
Depositing User : Symplectic Elements
Date Deposited : 17 Mar 2015 16:45
Last Modified : 28 May 2015 01:08
URI: http://epubs.surrey.ac.uk/id/eprint/805581

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