Up-spin scattering states across a Pt/SrTiO₃/Pt ferroelectric tunnel junction. In the top image the polarization direction points towards the center of the junction and in the bottom it points towards the interface.

From the article:

Defect-Assisted Tunneling Electroresistance in Ferroelectric Tunnel Junctions
Konstantin Klyukin, L. L. Tao, Evgeny Y. Tsymbal, and Vitaly Alexandrov
Phys. Rev. Lett. 121, 056601 (2018)

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