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2D Electron Gas with 100% Spin‐Polarization in the (LaMnO 3 ) 2 /(SrTiO 3 ) 2 Superlattice under Uniaxial Strain
Author(s) -
Cossu F.,
Jilili J.,
Schwingenschlögl U.
Publication year - 2014
Publication title -
advanced materials interfaces
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.671
H-Index - 65
ISSN - 2196-7350
DOI - 10.1002/admi.201400057
Subject(s) - superlattice , materials science , condensed matter physics , monoclinic crystal system , spins , electron , spin polarization , electronic structure , atomic orbital , crystal structure , crystallography , physics , chemistry , optoelectronics , quantum mechanics
By first‐principles calculations we investigate the structural, electronic, and magnetic properties of the (LaMnO 3 ) 2 /(SrTiO 3 ) 2 superlattice. We find that a monoclinic C 2h symmetry is energetically favorable and that the spins order ferromagnetically. Under both compressive and tensile uniaxial strain the electronic structure of the superlattice shows a half‐metallic character. In particular, a fully spin‐polarized two‐dimensional electron gas, which traces back to the Ti 3d xy orbitals, is achieved under compressive uniaxial strain.