Berlin 2015 – scientific programme

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HL: Fachverband Halbleiterphysik

HL 39: Posters II (Topological insulators; Graphene; Spintronics and spin physics; Quantum information science)

HL 39.17: Poster

Tuesday, March 17, 2015, 14:00–20:00, Poster F

Electrostatic induced graphene superlattice — •Nicolas Kurz — Institute of Nanotechnology, Karlsruhe Institute of Technology, Hermann-von-Helmholtz Platz 1, D- 76021 Karlsruhe, Germany

Graphene exhibits extraordinary transport properties such as extremly high electron mobility or outstanding thermal conductivity. What is maybe the most fascinating aspect of graphene is its linear dispersion in the vicinity of the K point, which is, hence, called Dirac point. It was predicted that by applying a periodic potential to graphene, the band structure can reveal extra Dirac points. So far the emergence of additional dirac points has been observed experimentally when graphene was put on top of hexagonal boron nitride, having same lattice structure and similar lattice constant. Due to the Van- der Waals interaction, a Moiré pattern is created which induces a superlattice.
However, this method lacks of tunability of the superlattice potential. We try to overcome this problem by using a special patterned metal gate which generates a 1D periodic potential. We use electron beam lithography and graphene encapsulated between hexagonal boron nitride in order to enhance the graphene’s transport properties. These type of heterostructure has been become known as ’Van der Waals heterostructures’ recently. We use a home-made transfer set-up and mechanical exfoliated material for the assembly of the heterostructure.