|title:||Nano- and Mesoscopic Systems|
Mesoscopic systems form a bridge between macroscopic systems governed by classical physics and microscopic systems governed by quantum physics. For solids and liquids this is typically a few to ten nanometers and involves a few thousand atoms or molecules. Hence, the mesoscopic scale is roughly identical to the nanoscale for most solids. Future high-tech applications such as nanotechnology require a deep understanding of the physics of mesoscopic systems.
In our group we are studying nanostructured materials like carbon nanotubes, graphene, boron nanotubes and sheets, inorganic nanowires, etc. We are primarily interested in exploring structural stability, electronic structure, transport properties, the influence of chemical functionalization and the effects at the nanostructure-lead interfaces. We use our results in modeling of nanocircuits (field-effect transistors, sensors, thermoelectric devices, etc.) to predict and optimize their performance. Our theoretical treatments range from model-based approaches to first-principle-based atomistic simulations.
On the experimental side we are primarily interested in the synthesis and characterization of novel nanostructured materials like CNTs, graphene, boron nanotubes and different inorganic nanowires as well as modification of their electronic properties by chemical functionalization. In co-operation with other groups of the chair, the pristine and modified nanostructures are used for the application in different devices ranging from solar cells to biosensors.
I. Gonzalez-Martinez, A. Bachmatiuk, S. Gorantla, J. Kunstmann, V. Bezugly, T. Gemming, B. Büchner, G. Cuniberti, and M. H. Rümmeli, J. Appl. Phys. 112, 024308 (2012).
G. Lackner, T. Mayer-Uhma, I. Endler, R. Boucher, F. Meissner, S. Scholz, M. Krug, V.Bezugly, M. Mkandawire, A. Majumder, D.A. Kovalenko, S. Conze, S. Hildebrandt, A.Michaelis, D.C. Lupascu, J. Mater. Sci. Eng. B 2, 334 (2012).
V. Bezugly, J. Kunstmann, B. Grundkötter-Stock, T. Frauenheim, T. Niehaus, G. Cuniberti, ACS Nano 5, 4997 (2011).
D. Nozaki, J. Kunstmann, F. Zörgiebel, W. M. Weber, T. Mikolajick and G. Cuniberti, Nanotechnology 22, 325703 (2011).
L. E. F. Foa Torres, G. Cuniberti, Appl. Phys. Lett. 94, 222103 (2009).
A. Cresti et al., Nano Res. 1, 361 (2008).
N. Nemec, D. Tomanek, G. Cuniberti, Phys. Rev. B 77, 125420 (2008).
N. Nemec, G. Cuniberti, Phys. Rev. B 75, 201404(R) (2007).
Viktor Bezugly (group leader)
Jens Kunstmann (former group leader)
Ignacio Gonzalez-Martinez (associated)
Hauke Rabbel (former member)
Hagen Eckert (former member)