Phase coherent transport in SrTiO3/LaAlO3 interfaces

The two-dimensional electron gas formed between SrTiO3 and LaAlO3 exhibits a variety of interesting physical properties which make it an appealing material for use in future spintronics and/or quantum-computing devices. For this kind of applications electrons have to retain their phase memory for sufficiently long times or length. Using a mesoscopic size device we were able to extract the phase coherence length, L-phi, and its temperature variation. We find the dephasing rate to have a power-law dependence on temperature. The power depends on the temperature range studied and sheet resistance as expected from dephasing due to strong electron-electron interactions.