I.V. Maznichenko, S. Ostanin, V.K. Dugaev, I. Mertig, Arthur Ernst,
"Impact of long-range disorder on the two-dimensional electron gas formation at a LaAlO3/SrTiO3 interface"
, in American Phys. Soc., in Physical Review Materials, Vol. 2, Nummer 7, Seite(n) 074003, 7-2018
Original Titel:
Impact of long-range disorder on the two-dimensional electron gas formation at a LaAlO3/SrTiO3 interface
Sprache des Titels:
Englisch
Original Kurzfassung:
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.
Forschungs-