Mechanical dissipation from charge and spin transitions in oxygen-deficient SrTiO3 surfaces

Marcin Kisiel (), Oleg O. Brovko, Dilek Yildiz, Rémy Pawlak, Urs Gysin, Erio Tosatti and Ernst Meyer ()
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Marcin Kisiel: University of Basel
Oleg O. Brovko: The Abdus Salam International Centre for Theoretical Physics (ICTP)
Dilek Yildiz: University of Basel
Rémy Pawlak: University of Basel
Urs Gysin: University of Basel
Erio Tosatti: The Abdus Salam International Centre for Theoretical Physics (ICTP)
Ernst Meyer: University of Basel

Nature Communications, 2018, vol. 9, issue 1, 1-7

Abstract: Abstract Bodies in relative motion separated by a gap of a few nanometers can experience a tiny friction force. This non-contact dissipation can have various origins and can be successfully measured by a sensitive pendulum atomic force microscope tip oscillating laterally above the surface. Here, we report on the observation of dissipation peaks at selected voltage-dependent tip-surface distances for oxygen-deficient strontium titanate (SrTiO3) surface at low temperatures (T = 5 K). The observed dissipation peaks are attributed to tip-induced charge and spin state transitions in quantum-dot-like entities formed by single oxygen vacancies (and clusters thereof, possibly through a collective mechanism) at the SrTiO3 surface, which in view of technological and fundamental research relevance of the material opens important avenues for further studies and applications.

Date: 2018
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DOI: 10.1038/s41467-018-05392-1

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