Disentanglement of growth dynamic and thermodynamic effects in LaAlO3/SrTiO3 heterostructures.

ABSTRACT: The influence of non-equilibrium and equilibrium processes during growth of LaAlO3/SrTiO3 (LAO/STO) heterostructures is analyzed. We investigate the electronic properties of LAO/STO heterostructures obtained at constant growth conditions after annealing in different oxygen atmospheres within the typical growth window (1 × 10(-4) mbar -1 × 10(-2) mbar). The variation of annealing conditions is found to cause a similar change of electronic properties as observed for samples grown in different oxygen pressure. The results indicate that equilibrium defect formation is the dominant process for establishing the properties of the two-dimensional electron gas (2DEG), while growth dynamics play a minor role in the typical LAO/STO growth regime. Furthermore, the effects of non-equilibrium processes

SUBMITTER: Xu C 

PROVIDER: S-EPMC4806350 | biostudies-literature | 2016 Mar

REPOSITORIES: biostudies-literature