Many-body correlations in a Cu-phthalocyanine STM single molecule junction

DIPC Seminars

Speaker
Andrea Donarini (University of Regensburg, Germany)
When
2016/02/29
13:00
Place
Donostia International Physics Center
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Many-body correlations in a Cu-phthalocyanine STM single molecule junction The electronic structure and the transport characteristics of single molecule junctions are strongly influenced by many-body correlations. Their fingerprints have been clearly observed in STM experiments both at the spectral and topographical level. We consider here a copper phthalocyanine (CuPc) molecule on an insulator coated substrate, and demonstrate the non- equilibrium tip induced control of the molecular spin state. We find that, under the condition of energetic proximity of many-body neutral excited states to the anionic groundstate, the system can undergo a population inversion towards these excited states. The resulting state of the system is accompanied by a change in the total spin quantum number. Experimental signatures of the crossover are the appearance of additional nodal planes in the topographical STM images as well as a strong suppression of the current near the center of the molecule. The robustness of the e ect against moderate charge conserving relaxation processes has also been tested.