Many-body correlations in a Cu-phthalocyanine STM single molecule junction
DIPC Seminars
- Speaker
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Andrea Donarini (University of Regensburg, Germany)
- When
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2016/02/29
13:00 - Place
- Donostia International Physics Center
- Add to calendar
-
iCal
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.