Berlin 2008 – wissenschaftliches Programm
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HL: Fachverband Halbleiterphysik
HL 51: Poster IV
HL 51.24: Poster
Donnerstag, 28. Februar 2008, 16:30–19:00, Poster D
Fiber optical interferometer for ultra-sensitive displacement detection in cryogenic and high magnetic field environment. — •Martin Borowski, Tjark Windisch, Marc A. Wilde, and Dirk Grundler — Physik Department E10, Technische Universität München, James-Franck-Str. 1, 85748 Garching, Germany
A fiber optical interferometer with sub-Å resolution and in-situ four-axis nanopositioning sample holder for cryogenic (300 mK) and high magnetic field (15 T) applications is presented.
By probing the magnetization M=−∂ U/∂ B | N,T at low temperatures information can be gained about the ground state energy of a low dimensional electron system. For this we use micromechanical GaAs-based cantilever magnetometers (MCMs) with integrated or flip-chip mounted electron systems. This technique is established for large-area two-dimensional electron systems. The study of micron-sized samples e.g. graphene flakes, however calls for miniaturized cantilevers and a setup, where the sensitivity can be optimized in situ. The challenge is to achieve a sufficiently small footprint to fit the setup into a commercially available 3He cryostat. The realization and characterization of the magnetometer will be reported.
We thank Jan Ivo Springborn and Niels Ruhe for technical assistance and the German Excellence Initiative for financial support via the ”Nanosystems Initiative Munich (NIM)”.