2017/05/29 by Karsten Wolff, K. Wolff, R. Schäfer +6
Chemistry · Engineering · Materials Science · Physics and Astronomy · #Anisotropy #Chemistry #Condensed matter physics #Coupling (piping) #Crystallography #Electronic and Structural Properties of Oxides #Lattice (music) #Magnetic and transport properties of perovskites and related materials #Magnetic field #Magnetoresistance #Materials science #Physics #Quantum mechanics #Semiconductor materials and devices #cond-mat.str-el
paper · pdf · doi:10.1103/physrevb.95.245132
arxiv created 2017/05/29 · openalex created_date 2017/06/05 · openalex publication_date 2017/06/26 · arxiv updated 2017/08/02 · openalex updated_date 2026/08/05
Transport measurements on the two-dimensional electron system in Al2O3/SrTiO3 heterostructures indicate significant noncrystalline anisotropic behavior below T\ensuremath≈30\phantom\rule0.16em0exK. Lattice dislocations in SrTiO3 and interfacial steps are suggested to be the main sources for electronic anisotropy. Anisotropic defect scattering likewise alters magnetoresistance at low temperature remarkably and influences spin-orbit coupling significantly by the Elliot-Yafet mechanism of spin relaxation, resulting in anisotropic weak localization. Applying a magnetic field parallel to the interface results in an additional field-induced anisotropy of the conductance, which can be attributed to Rashba spin-orbit interaction. Compared to LaAlO3/SrTiO3, Rashba coupling seems to be reduced, indicating a weaker polarity in Al2O3/SrTiO3 heterostructures.