Polarization sensitive surface band structure of doped BaTiO3(001)

Abstract

We present a spatial and wave-vector resolved study of the electronic structure of micron sized ferroelectric domains at the surface of a BaTiO3(001) single crystal. The n-type doping of the BaTiO3 is controlled by in-situ vacuum and oxygen annealing, providing experimental evidence of a surface paraelectric-ferroelectric transition below a critical doping level. Real space imaging of photoemission threshold, core level and valence band spectra show contrast due to domain polarization. Reciprocal space imaging of the electronic structure using linearly polarized light provides unambiguous evidence for the presence of both in and out-of plane polarization with two and fourfold symmetry, respectively. The results agree well with first principles calculations.

6 pages, 5 figures

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Cited by in corpus (4)

• Depth profiling charge accumulation from a ferroelectric into a doped Mott insulator
• Observation of Wannier-Stark localization at the surface of BaTiO${}_3$ films by photoemission
• High resolution depth profiling using near-total-reflection hard X-ray photoelectron spectroscopy
• Exploring interlayer Dirac cone coupling in commensurately rotated few-layer graphene on SiC(000-1)