Weiwei Luo
(Department of Quantum Matter Physics, University of Geneva, Switzerland)
Probing the local transport properties of two-dimensional electron systems (2DES) confined at buried interfaces requires a non-invasive technique with a high spatial resolution operating in a broad temperature range. In this paper, we investigate the scattering-type scanning near field optical microscopy as a tool for studying the conducting LaAlO$_3$/SrTiO$_3$ interface from room temperature down to 6K. We show that the near-field optical signal, in particular its phase component, is highly sensitive to the transport properties of the electron system present at the interface. Our model allows to quantitatively correlate changes in the optical signal with the variation of the 2DES transport properties induced by cooling and by electrostatic gating. Imaging conducting nano-channels reveals the high spatial resolution of the technique.
Weiwei Luo
(Department of Quantum Matter Physics, University of Geneva, Switzerland)
Margherita Boselli
(Department of Quantum Matter Physics, University of Geneva, Switzerland)
Jean-Marie Poumirol
(Department of Quantum Matter Physics, University of Geneva, Switzerland)
Ivan Ardizzone
(Department of Quantum Matter Physics, University of Geneva, Switzerland)
Jérémie Teyssier
(Department of Quantum Matter Physics, University of Geneva, Switzerland)
Dirk van der Marel
(Department of Quantum Matter Physics, University of Geneva, Switzerland)
Stefano Gariglio
(Department of Quantum Matter Physics, University of Geneva, Switzerland)
Jean-Marc Triscone
(Department of Quantum Matter Physics, University of Geneva, Switzerland)
Alexey B. Kuzmenko
(Department of Quantum Matter Physics, University of Geneva, Switzerland)
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