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Title: Strain-tuning of transport gaps and semiconductor-to-conductor phase transition in twinned graphene

Journal Article · · Acta Materialia

We show, through the use of the Landauer-Büttiker (LB) formalism and a tight-binding (TB) model, that the transport gap of twinned graphene can be tuned through the application of a uniaxial strain in the direction normal to the twin band. Remarkably, we find that the transport gap Egap bears a square-root dependence on the control parameter ϵx – ϵc, where ϵx is the applied uniaxial strain and ϵc ~ 19% is a critical strain. We interpret this dependence as evidence of criticality underlying a continuous phase transition, with ϵx – ϵc playing the role of control parameter and the transport gap Egap playing the role of order parameter. For ϵx < ϵc, the transport gap is non-zero and the material is semiconductor, whereas for ϵx < ϵc the transport gap closes to zero and the material becomes conductor, which evinces a semiconductor-to-conductor phase transition. The computed critical exponent of 1/2 places the transition in the meanfield universality class, which enables far-reaching analogies with other systems in the same class.

Research Organization:
Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
Sponsoring Organization:
USDOE National Nuclear Security Administration (NNSA)
Grant/Contract Number:
NA0003525
OSTI ID:
1872056
Report Number(s):
SAND2022-7419J; 706952
Journal Information:
Acta Materialia, Vol. 234; ISSN 1359-6454
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English

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