Dresden 2003 – scientific programme

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TT: Tiefe Temperaturen

TT 12: Mesoskopische Systeme II

TT 12.3: Talk

Wednesday, March 26, 2003, 15:15–15:30, HSZ03

Low-Temperature Conductance Measurements On Single Molecules — •Joachim Reichert¹, Heiko B. Weber¹, Marcel Mayor¹, and Hilbert von Löhneysen² — ¹Forschungszentrum Karlsruhe, Institut für Nanotechnologie, Postfach 3640, D-76021 Karlsruhe — ²Physikalisches Institut, Universität Karlsruhe, D-76128 Karlsruhe and Forschungszentrum Karlsruhe, Institut für Festkörperphysik, D-76021 Karlsruhe

We present an experimental protocol which allows to perform conductance spectroscopy on single organic molecules at low temperatures (T ≈ 30K) [1]. The conductance data obtained at low-T with a conjugated sample molecule show a highly improved data quality with a higher stability, narrower linewidth and substantially reduced noise compared to room-temperature (RT) data [2]. For the RT measurements a rather broad range of sample-to-sample fluctuations was attributed to different microscopic contact realisations. The smaller number of variations in the recorded low-T spectra might indicate that here energetically favourable configurations occure more frequently. Thus the comparability of experimental data with other experiments as well as with theoretical simulations is considerably improved.

[1] J. Reichert, H. B. Weber, M. Mayor, H. v. Löhneysen, cond-mat/0212272 (2002).

[2] J. Reichert, R. Ochs, D. Beckmann, H. B. Weber, M. Mayor, H. v. Löhneysen, Phys. Rev. Lett. 88 (2002) 176804.