Magneto transport in light tuned STO-based interfaces

Recently we have shown that light can be utilized to tune transport properties of strontium titanate based interfaces at low temperat ures in a controlled manner [1]. The effect has been observed at the inter­ face with lanthanum aluminate and aluminum oxide. Light exposure at temperatures below T = 1K leads to a persistent reduction of resis­ tance. The reduction depends on exposure <lose, can be as !arge as a factor of five, and is accom panied by a reduction of the superconduct­ ing transition temperat ure 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 es­ tablished 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 re­ sults are cornpared to the experimental findings.

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