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A route to ultrathin quantum gases at polar perovskite heterointerfaces
Author(s) -
Nazir S.,
Schwingenschlögl U.
Publication year - 2012
Publication title -
physica status solidi (rrl) – rapid research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.786
H-Index - 68
eISSN - 1862-6270
pISSN - 1862-6254
DOI - 10.1002/pssr.201206354
Subject(s) - quantum , polar , perovskite (structure) , ab initio , chemical physics , oxide , slab , materials science , quantum well , nanotechnology , condensed matter physics , chemistry , physics , crystallography , quantum mechanics , organic chemistry , geophysics , laser , metallurgy
Oxide interfaces are attracting interest in recent years due to special functionalities of two‐dimensional quantum gases. However, with typical thicknesses of at least 10–12 Å the gases still extend considerably in the third dimension, which compromises the size of quantum effects. To overcome this limitation, we propose incorporation of highly electronegative cations, such as Ag. By ab initio calculations, we demonstrate the formation of a mobile two‐dimensional hole gas in AgNbO 3 /SrTiO 3 that is confined to an ultrathin slab of only 5.6 Å thickness. Electronegative cations therefore are a promising way to enhance the quantum nature of hole gases. (© 2012 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)