Artículo
Strain-tuning of transport gaps and semiconductor-to-conductor phase transition in twinned graphene
Autor/es | Arca Cebrián, Francisco
Méndez Granado, Juan Pedro Ortiz, Michael Ariza Moreno, María del Pilar |
Departamento | Universidad de Sevilla. Departamento de Mecánica de Medios Continuos y Teoría de Estructuras |
Fecha de publicación | 2022-08 |
Fecha de depósito | 2022-07-19 |
Publicado en |
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Resumen | 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 ... 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 x − c , where x is the applied uniaxial strain and c ∼ 19% is a critical strain. We interpret this dependence as evidence of criticality underlying a continuous phase transition, with x − c playing the role of control parameter and the transport gap Egap playing the role of order parameter. For x < c , the transport gap is non-zero and the material is semiconductor, whereas for x > c 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. |
Agencias financiadoras | Junta de Andalucía, Consejería de Transformación Económica, Industria, Conocimiento y Universidades Ministerio de Ciencia, Innovación y Universidades |
Identificador del proyecto | P18-RT- 1485
RTI2018-094325-B-I00. |
Cita | Arca Cebrián, F., Méndez, J.P., Ortiz, M. y Ariza Moreno, M.d.P. (2022). Strain-tuning of transport gaps and semiconductor-to-conductor phase transition in twinned graphene. Acta Materialia, 234, 117987. |
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