Berlin 2015 – scientific programme
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HL: Fachverband Halbleiterphysik
HL 104: Transport: Molecular electronics (TT with CPP/HL/MA/O)
HL 104.5: Talk
Friday, March 20, 2015, 10:30–10:45, H 0110
Quantum interference in thermoelectric molecular junctions: A toy model perspective — •Daijiro Nozaki1, Stas. M. Avdoshenko2, Haldun Sevinçli3, and Gianaurelio Cuniberti1,4,5 — 1Institute for Materials Science and Max Bergmann Center of Biomaterials, TU Dresden, Germany — 2Department of Chemistry and Institute for Computational Engineering and Sciences, University of Texas at Austin, USA — 3Department of Materials Science and Engineering, Izmir Institute of Technology, Turkey — 4Dresden Center for Computational Materials Science (DCCMS), TU Dresden, Germany — 5Center for Advancing Electronics Dresden (cfAED), TU Dresden, Germany
In order to reveal the relationship between the line shape of the transmission spectra affected by quantum interference and the electronic structures, we consider a homogeneous toy model where all on-site energies are identical and model four types of molecular junctions due to their topological connectivities. We systematically analyze their transmission spectra, density of states, and thermoelectric properties. Even without the degree of freedom for on-site energies an asymmetric Fano peak could be realized in the homogeneous systems with the cyclic configuration. We also calculate the thermoelectric properties of the model systems with and without fluctuation of on-site energies. Even under the fluctuation of the on-site energies, the finite thermoelectrics are preserved for the Fano resonance, thus cyclic configuration is promising for thermoelectric applications.
[1] D. Nozaki, H. Sevinçli, S. M. Avdoshenko, G. Cuniberti,
J. Appl. Phys. 117, 074308 (2014).