arXiv subjects

S. Schmidmeier

Publications and source records attributed to S. Schmidmeier.

2 recordsLinked to original sources

arXiv2011

Stacking-order dependent transport properties of trilayer graphene

We report markedly different transport properties of ABA- and ABC-stacked trilayer graphenes. Our experiments in double-gated trilayer devices provide evidence that a perpendicular electric field opens an energy gap in the ABC trilayer, while it causes the increase of a band overlap in the ABA trilayer. In a perpendicular magnetic field, the ABA trilayer develops quantum Hall plateaus at filling factors of ν= 2, 4, 6... with a step of Δν= 2, whereas the inversion symmetric ABC trilayer exhibits plateaus at ν= 6 and 10 with 4-fold spin and valley degeneracy.

cond-mat.mes-hall↗

arXiv2009

Characterisation of Ferromagnetic Contacts to Carbon Nanotubes

We present an investigation of different thin-film evaporated ferromagnetic materials for their suitability as electrodes in individual single-wall and multi-wall carbon nanotube-based spin devices. Various electrode shapes made from permalloy (Ni_{81}Fe_{19}), the diluted ferromagnet PdFe, and PdFe/Fe bilayers are studied for both their micromagnetic properties and their contact formation to carbon nanotubes. Suitable devices are tested in low-temperature electron transport measurements, displaying the typical tunneling magnetoresistance of carbon nanotube pseudo spin valves.

cond-mat.mes-hall↗