Charge distribution in an oxide heterostructure

We employ infrared spectroscopy to address the electrodynamic properties of the LaNiO3/LaMnO3 superlattice series,an heterostructure based on strongly correlated materials. Our results show that charge redistribution across the interfaces is the key to its unconventional properties.

P. Di Pietro et al., Phys. Rev. Lett. 114, 156801 (2015)

Engineering new artificial materials represents the main avenue to the realization of novel electronic devices with desired functionalities. The great performances of semiconducting heterostructures can be pushed even further by replacing the conventional semiconductors with strongly correlated electron systems. The combination of the unique properties of correlated materials with the design flexibility of heterostructures represents a very promising strategy to boost the performance of devices based on new concepts.  By employing infrared spectroscopy at the SISSI beamline of the
Elettra synchrotron, we have evidenced the presence of significant excitations at mid-infrared frequencies in the LaNiO3/LaMnO3 superstructures not observed in LaNiO3 or LaMnO3 alone. We attribute these excitations to interfacial charge redistribution.

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Spectral Weight Redistribution in LaNiO3/LaMnO3 Superlattices from Optical Spectroscopy.



Ultima modifica il Martedì, 15 Settembre 2015 14:46