Regensburg 2019 – wissenschaftliches Programm
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DS: Fachverband Dünne Schichten
DS 14: Poster
DS 14.12: Poster
Dienstag, 2. April 2019, 17:00–20:00, Poster E
Impact of long-range disorder on the 2D electron gas formation at a LaAlO3/SrTiO3 interface — •Igor Maznichenko1, Sergey Ostanin1, Arthur Ernst2,3, and Ingrid Mertig1,2 — 1Institute for Physics, Martin Luther University Halle-Wittenberg, D-06099 Halle, Germany — 2Max Planck Institute of Microstructure Physics, Weinberg 2, D-06120 Halle, Germany — 3Institute for Theoretical Physics, Johannes Kepler University, Altenberger Straße 69, 4040 Linz, Austria
A two-dimensional electron gas (2DEG) can be formed at an interface between two insulators such as LaAlO3 and SrTiO3 without any additional doping. Nevertheless, structural imperfections or defects at the interface, which may arise during the growth process or be of another origin, can definitely affect 2DEG properties either increasing or reducing the 2DEG density. In this work, we study 2DEG formation at both perfect and imperfect interfaces of LaAlO3/SrTiO3 heterostructures in the framework of the density functional theory. Using a first-principles Green function method within a coherent-potential approximation, we investigate consistently the development of the 2DEG density starting from a defectless interface and introducing sequentially various kinds of long-range disorder such as cation intermixing and oxygen vacancies. Finally, we evaluate the 2DEG carrier density from the Fermi surface cross sections and effective masses of the carriers, which may be directly related to the multiple transport phenomena in the system [1].
[1] I. V. Maznichenko et al, Phys. Rev. Materials 2, 074003 (2018).