First-principles study of two-dimensional electron and hole gases at the head-to-head and tail-to-tail <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:msup><mml:mn>180</mml:mn><mml:mo>∘</mml:mo></mml:msup></mml:math> domain walls in <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:msub><mml:mi>PbTiO</mml:mi><mml:mn>3</mml:mn></mml:msub></mml:math> ferroelectric thin films
Physical review. B./Physical review. B