Regensburg 2019 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 14: Graphene
TT 14.3: Vortrag
Montag, 1. April 2019, 15:30–15:45, H22
Transport through time dependent magnetic barriers in graphene — •Nico Leumer1 and Wolfgang Häusler2 — 1Fakultät für Physik, Universität Regensburg — 2Fakultät für Physik, Universität Augsburg
Studies of tunneling through time dependent scalar potential barriers have a long history, starting with the seminal work by Büttiker and Landauer [1]. Since in graphene electrostatic barriers are inefficient to guide carriers, due to Klein tunneling, we study here, to our knowledge for the first time, time dependent magnetic barriers. We discuss the difficulty of induced electric fields. Contrary to the scalar case, the problem now becomes inherently 2-dimensional. While more involved, we employ a strategy in the spirit of [1] by using a suitable gauge. For periodic time dependence, we find analytically the transmission through side bands. Depending on parameters, however, side bands may entirely close.
M. Büttiker and R. Landauer, Phys. Rev. Lett. 49, 1739 (1982)