Mechanical dissipation from charge and spin transitions in oxygen deficient SrTiO_3

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 (SrTiO_3) surface at low temperatures (T = 5K). 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 SrTiO_3 surface, which in view of technological and fundamental research relevance of the material opens important avenues for further studies and applications.

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Cited by in corpus (4)

• Joule meets van der Waals: Mechanical dissipation via image potential states on a topological insulator surface
• Atomic-scale observation of localized phonons at FeSe/SrTiO3 interface
• Low-Temperature Insulating Phase of the Si(111)--7$\times$7 Surface
• Kondo nanomechanical dissipation in the driven Anderson impurity model