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TT: Fachverband Tiefe Temperaturen

TT 47: Poster Session Correlated Electrons 2

TT 47.26: Poster

Mittwoch, 18. März 2020, 15:00–19:00, P2/3OG

Magneto transport in light tuned STO-based interfaces — •Roland Schäfer, Daniel Arnold, and Dirk Fuchs — Institut fürFestkörperphysik, KIT, Karlsruhe

Recently we have shown that light can be utilized to tune transport properties of strontium titanate based interfaces at low temperatures in a controlled manner [1]. The effect has been observed at the interface with lanthanum aluminate and aluminum oxide. Light exposure at temperatures below T=1 K leads to a persistent reduction of resistance. The reduction depends on exposure dose, can be as large as a factor of five, and is accompanied by a reduction of the superconducting transition temperature reminiscent of the overdoped side of the dome structure in back gate experiments. Persistent changes can be reverted by heating the samples to a moderate temperature of about T≈15 K.

Here we present and discuss magneto transport data. The well established band structure of the two dimensional electron gas at the surface is used to calculate the conductance tensor as function of the magnetic field by semiclassical transport theory. The theoretical results are compared to the experimental findings.

[1] D. Arnold et. al, APL 115, 122601 (2019)