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TT: Fachverband Tiefe Temperaturen

TT 65: Poster Session Topological Topics

TT 65.9: Poster

Donnerstag, 19. März 2020, 15:00–19:00, P2/EG

Controlling a band gap at the K-points in graphene — •Frederik Bartelmann, Daniela Pfannkuche, Marta Prada, and Alexander Chudnovskiy — Universität Hamburg

In a tight-binding description without spin orbit interaction (SOI), the valence and conduction band of graphene touch at the K-points of the Brillouin zone [1]. SOI creates a band gap proportional to the contribution of atomic d-orbitals to the band states [2-4]. This contribution can be influenced via electric interactions, and consequently can the size of the gap. The effect of time-periodic electric fields on a tight-binding model of graphene is studied numerically by Floquet formalism and analytically by perturbation theory, to determine a method of controlling the band gap.

[1] A. H. Castro Neto, F. Guinea, N. M. R. Peres, K. S. Novoselov, and A. K. Geim, Rev. Mod. Phys. 81, 109, 2009

[2] S. Konschuh, M. Gmitra, and J. Fabian, Phys. Rev. B, 2010

[3] J. Sichau, M. Prada, T. Anlauf, T. J. Lyon, B. Bosnjak, L. Tiemann, and R. H. Blick, Phys. Rev. Lett. 122, 046403, 2019

[4] C. L. Kane and E. J. Mele, Phys. Rev. Lett. 95, 226801, 2005