Charge fractionalization in oxide heterostructures: A field-theoretical model
Department of Physical Sciences, Indian Institute of Science Education and Research Kolkata - Mohanpur, West Bengal 741246, India
Received: 6 May 2016
Accepted: 26 June 2016
LaAlO3/SrTiO3 heterostructure with polar and non-polar constituents has been shown to exhibit interface metallic conductivity due to fractional charge transfer to the interface. The interface reconstruction by electron redistribution along the (001) orientation, in which half of an electron is transferred per two-dimensional unit cell to the adjacent planes, resulting in a net transfer of half of the charge to both the interface and topmost atomic planes, has been ascribed to a polar discontinuity at the interface in the polar catastrophe model. This avoids the divergence of the electrostatic potential, as the number of layers are increased, producing an oscillatory electric field and finite potential. Akin to the description of charge fractionalization in quasi–one-dimensional polyacetylene by the field-theoretic Jackiw-Rebbi model with fermions interacting with a topologically non-trivial background field, we show an analogous connection between the polar catastrophe model and the Bell-Rajaraman model, where the charge fractionalization occurs in the soliton free sector as an end effect.
PACS: 73.40.-c – Electronic transport in interface structures / 03.70.+k – Theory of quantized fields / 77.84.Bw – Elements, oxides, nitrides, borides, carbides, chalcogenides, etc.
© EPLA, 2016