Regensburg 2010 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 40: TR: Nanoelectronics III: Molecular Electronics 2
TT 40.2: Vortrag
Freitag, 26. März 2010, 10:45–11:15, H20
Spin-polarized transport and thermoelectric properties of organometallic nanocontacts — •Steven Achilles1, Volodymyr V. Maslyuk1, Mads Brandbyge2, and Ingrid Mertig1 — 1Institute of Physics, Martin Luther University, D-06120 Halle, Germany — 2DTU Nanotech - Department of Micro- and Nanotechnology, Technical University of Denmark, DK-2800 Kongens Lynby, Denmark
Understanding the electronic and thermoelectric transport properties is the key issue in understanding new devices based on the principles of quantum mechanics. We present a theoretical study of the length dependence of both conductance and thermopower of organometallic vanadium-benzene molecules (VnBzn+1) sandwiched between magnetic Co(100) electrodes. We show that the molecules with n≥3 are efficient spin-filters. Namely, we find that the zero bias conductance of the majority electrons is small and decays exponentially with increasing length of the molecule and is in the tunneling regime while the minority electrons show metallic conductance. We show furthermore that the thermopower strongly depends on the length of the molecules and can even change sign as a function of length and temperature [1], and as a function of the relative orientation of the lead magnetizations [2].
[1] V. V. Maslyuk, S.Achilles, and I. Mertig, Solid State Communications, in press
[2] V. V. Maslyuk, S.Achilles, and I. Mertig, submitted