Novel materials are in great demand for future applications. The discovery of graphene, a
one atom thick carbon layer, holds the promise for unique device architectures and …

Graphene, a single layer of graphite, is a unique two-dimensional electron system as well as
nature's thinnest elastic membrane. Here we review and describe our work on suspended …

We investigate electric transport in graphene on SiO2 in the high field limit and report on the
formation of pn junctions. Previously, doping of graphene has been achieved by using …

Bilayer graphene has attracted considerable interest due to the important role played by
many-body effects, particularly at low energies. Here we report local compressibility …

We report pronounced magnetoconductance oscillations observed on suspended bilayer
and trilayer graphene devices with mobilities up to 270 000 cm 2/V s. For bilayer devices, we …

Monolithic and patterned aminopropyltriethoxysilane (APTES) layers are used to create n-
doped graphene, graphene p–n junctions, and FET devices containing p–n junctions in the …

Transport measurements normally provide a macroscopic, averaged view of the sample so
that disorder prevents the observation of fragile interaction-induced states. Here, we …

Graphene's linear dispersion relation and the attendant implications for bipolar electronics
applications have motivated a range of experimental efforts aimed at producing pn junctions …

We perform transport measurements in high quality bilayer graphene pnp junctions with
suspended top gates. At a magnetic field B= 0, we demonstrate band gap opening by an …

We investigate integer and fractional quantum Hall states in quantum point contacts (QPCs)
of different geometries, defined in AlGaAs/GaAs heterostructures employing different doping …