Regensburg 2013 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 31: Correlated Electrons: Low-Dimensional Systems -Materials 1
TT 31.7: Vortrag
Dienstag, 12. März 2013, 11:15–11:30, H41
High mobility of the strongly confined hole gas in AgTaO3/ SrTiO3 — •Udo Schwingenschlögl, Safdar Nazir, and Mousumi Upadhyay-Kahaly — KAUST, PSE Division, Thuwal, Saudi Arabia
A theoretical study of the two-dimensional hole gas at the (AgO)−/ (TiO2)0 p-type interface in the AgTaO3/SrTiO3 (001) heterostructure is presented. The Ag 4d states strongly hybridize with the O 2p states and contribute to the hole gas. It is demonstrated that the holes are confined to an ultra thin layer (∼ 4.9 Å)
with a considerable carrier density of ∼1014 cm−2. We estimate a hole mobility of 18.6 cm2V−1s−1, which is high enough to enable device applications.
[1] Appl. Phys. Lett. 100, 201607 (2012)