Surface polarization and edge charges

Abstract

The term "surface polarization" is introduced to describe the in-plane polarization existing at the surface of an insulating crystal when the in-plane surface inversion symmetry is broken. Here, the surface polarization is formulated in terms of a Berry phase, with the hybrid Wannier representation providing a natural basis for study of this effect. Tight binding models are used to demonstrate how the surface polarization reveals itself via the accumulation of charges at the corners/edges for a two dimensional rectangular lattice and for GaAs.

5 pages, 4 figures

References in corpus (5)

• Computing topological invariants without inversion symmetry
• Observation of Dirac node formation and mass acquisition in a topological crystalline insulator
• Wannier Center Sheets in Topological Insulators
• Engineering polar discontinuities in honeycomb lattices
• Orbital ordering induced ferroelectricity in SrCrO3

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