學術演講
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2019-01-03 [Colloquium] Charge transport at complex oxide interface Prof. Wei-Li Lee(Institute of Physics, Academia Sinica, Taipei, Taiwan)
Abstract
Compex oxide interface has been an extraordinary system to study various exotic physical phnomenon and intriguing interface properties. In this talk, we will review our recent result on the investigation of the charge transport of the quasi-two-dimensional electron gas(q2DEG) at the interface of LaAlO3(LAO) and SrTiO3(STO), where the high quality epitaixal STO and LAO films were grown by oxide MBE facility at institute of Physics at Academia Sinica. The n-type carrirers were found to highly confined at the LAO/STO interface, which becomes superconducting as the temperature drops below  about 0.3K. Three subjects will be discussed. First is the effect of the LAO stoichiometry on the q2DEG at interface. In the second subject, we will show the influence of the additional epitaxial STO-capping layer on LAO/STO to the charge transport near the LAO/STO interface. A long-lasting puzzle and challlenge is whether a hole-type conduction near the LAO/STO interface. Through careful two-band model fittings to the magneto-transport data, we uncovered the existence of the additonal hole type condution channel in STO-capped LAO/STO samples. At last, we will present the results on the determination of spin-orbit scattering lifetime of the q2DEG from the superconducting upper critical flied asisotorpy, where a strong evidence for the existence of intriguing electronic phase separation at the interface is revealed.