Abdullah H M, Bahlouli H, Peeters F M, Van Duppen B
Department of Physics, King Fahd University of Petroleum and Minerals, 31261 Dhahran, Saudi Arabia. Saudi Center for Theoretical Physics, PO Box 32741, Jeddah 21438, Saudi Arabia. Department of Physics, University of Antwerp, Groenenborgerlaan 171, B-2020 Antwerp, Belgium.
J Phys Condens Matter. 2018 Sep 26;30(38):385301. doi: 10.1088/1361-648X/aad9c7. Epub 2018 Aug 13.
Bilayer graphene samples may exhibit regions where the two layers are locally delaminated forming a so-called quantum blister in the graphene sheet. Electron and hole states can be confined in this graphene quantum blisters (GQB) by applying a global electrostatic bias. We scrutinize the electronic properties of these confined states under the variation of interlayer bias, coupling, and blister's size. The spectra display strong anti-crossings due to the coupling of the confined states on upper and lower layers inside the blister. These spectra are layer localized where the respective confined states reside on either layer or equally distributed. For finite angular momentum, this layer localization can be at the edge of the blister and corresponds to degenerate modes of opposite momenta. Furthermore, the energy levels in GQB exhibit electron-hole symmetry that is sensitive to the electrostatic bias. Finally, we demonstrate that confinement in GQB persists even in the presence of a variation in the inter-layer coupling.
