Universal Conductance Fluctuations in Electrolyte-Gated SrTiO3 Nanostructures

David Goldhaber-Gordon; J. R. Williams; P. Gallagher; Sam W. Stanwyck

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Universal Conductance Fluctuations in Electrolyte-Gated SrTiO3 Nanostructures

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arxiv 1309.1494 v1 pith:Y4VV4DRB submitted 2013-09-05 cond-mat.mes-hall

Sam W. Stanwyck , P. Gallagher , J. R. Williams , David Goldhaber-Gordon This is my paper · ORCID

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keywords conductancefluctuationsuniversaldephasingelectronratecharacteristicconductor

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We report low-temperature magnetoconductance measurements of a patterned two-dimensional electron system (2DES) at the surface of strontium titanate, gated by an ionic liquid electrolyte. We observe universal conductance fluctuations, a signature of phase-coherent transport in mesoscopic devices. From the universal conductance fluctuations we extract an electron dephasing rate linear in temperature, characteristic of electron-electron interaction in a disordered conductor. Furthermore, the dephasing rate has a temperature-independent offset, suggestive of unscreened local magnetic moments in the sample.

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