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A recent report [Kiguchi {\it et al.}, Phys. Rev. B {\bf 68}, 115402 (2003)]that the (111) surface of 5 MgO layers grown epitaxially on Ag(111) becomesmetallic to reduce the electric dipole moment raises a question of what willhappen when we have fewer MgO layers. Here we have revealed, firstexperimentally with electron energy-loss spectroscopy, that MgO(111) remainsmetallic even when one-layer thick, and theoretically with the densityfunctional theory that the metallization should depend on the nature of thesubstrate. We further show, with a spin-density functional calculation, that aferromagnetic instability may be expected for thicker films.Comment: 5 pages, 7 figure

physical review. b, condensed matter and materials physics

Polar surface engineering in ultrathin<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mi mathvariant="normal">MgO</mml:mi><mml:mrow><mml:mo>(</mml:mo><mml:mrow><mml:mn>111</mml:mn></mml:mrow><mml:mo>)</mml:mo></mml:mrow><mml:mo>∕</mml:mo><mml:mi mathvariant="normal">Ag</mml:mi><mml:mrow><mml:mo>(</mml:mo><mml:mrow><mml:mn>111</mml:mn></mml:mrow><mml:mo>)</mml:mo></mml:mrow></mml:mrow></mml:math>: Possibility of a metal-insulator transition and magnetism

Polar surface engineering in ultrathinMgO(111)∕Ag(111): Possibility of a metal-insulator transition and magnetism