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- Leibniz University HannoverDE9 papers
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10 papers · 1 filter
Graphene p-n junction Arrays as Quantum-Hall Resistance Standards
Mirosław Woszczyna, Miriam Friedemann, Thorsten Dziomba +2
We demonstrate a device concept to fabricate resistance standards made of quantum Hall series arrays by using p-type and n-type graphene. The ambipolar nature of graphene allows fa…
Cross sections for proton-induced reactions on Pd isotopes at energies relevant for the gamma process
I. Dillmann, L. Coquard, C. Domingo-Pardo +11
Proton-activation reactions on natural and enriched palladium samples were investigated via the activation technique in the energy range of E_p=2.75 MeV to 9 MeV, close to the uppe…
Conversion of self-assembled monolayers into nanocrystalline graphene: Structure and electric transport
Andrey Turchanin, Dirk Weber, Matthias Buenfeld +7
Graphene-based materials have been suggested for applications ranging from nanoelectronics to nanobiotechnology. However, the realization of graphene-based technologies will requir…
Mechanically stacked 1 nm thick carbon nanosheets: Ultrathin layered materials with tunable optical, chemical and electrical properties
Christoph T. Nottbohm, Andrey Turchanin, Andre Beyer +2
Carbon nanosheets are mechanically stable free-standing two-dimensional materials with a thickness of ~1 nm and well defined physical and chemical properties. They are made by radi…
One nanometer thin carbon nanosheets with tunable conductivity and stiffness
Andrey Turchanin, Andre Beyer, Christoph Nottbohm +7
We present a new route for the fabrication of ultrathin (~1 nm) carbon films and membranes, whose electrical behavior can be tuned from insulating to conducting. Self-assembled mon…
A quantized current source with mesoscopic feedback
Lukas Fricke, Frank Hohls, Niels Ubbelohde +7
We study a mesoscopic circuit of two quantized current sources, realized by non-adiabatic single- electron pumps connected in series with a small micron-sized island in between. We…