Dresden 2020 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 13: Graphene (joint session TT/DY/HL)
TT 13.4: Vortrag
Montag, 16. März 2020, 15:45–16:00, HSZ 201
Electronic properties in a Bernal bilayer graphene monitored by selective functionalization — •Ahmed Missaoui1,3, Jouda khabthani1, Didier Mayou2, and Guy Trambly de Laissardière3 — 1Laboratoire de la Physique de la Matière Condensée, Faculté des Sciences de Tunis, Université de Tunis El Manar, Tunis, Tunisia — 2Institut Néel, CNRS, Univ. Grenoble Alpes, France — 3Laboratoire de Physique théorique et Modélisation, CNRS , Univ. de Cergy- Pontoise, France
The absence of a band gap in the monolayer graphene presents a great limitation of the fields of application. In a Bernal bilayer of graphene we can exceed its limits with induce a tunable band gap here by applying a gate voltage. In this context, we study the electronic properties of bilayer graphene in the presence of adsorbates such as hydrogene. We used a tight binding modelisation and DFT calculations for our study. We analyze [1] the effects of a selective distribution of adosrbats between the two sublattices A and B [2] on band structure and the microscopic conductivity with Kubo formalisim. The results show that in some cases depending on Fermi energy value and specific adsorbate distribution a gap appears, and in others cases, a linear dispersion with an increase in conductivity with the concentrations is reported.
[1] Jyoti. Katoch et al., Phys. Rev. Lett. 121, 136801 (2018)
[2] A. Missaoui et al., J. Phys. : Condens. Matter 30, 195701 (2018)