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Resonant Tunneling Across A Ferroelectric Domain Wall, M. Li, L. L. Tao, J. P. Velev, Evgeny Y. Tsymbal

Evgeny Tsymbal Publications

Motivated by recent experimental observations, we explore electron transport properties of a ferroelectric tunnel junction (FTJ) with an embedded head-to-head ferroelectric domain wall, using first-principles density-functional theory calculations. We consider a FTJ with La_0.5Sr_0.5MnO₃ electrodes separated by a BaTiO₃ barrier layer and show that an in-plane charged domain wall in the ferroelectric BaTiO₃ can be induced by polar interfaces. The resulting V-shaped electrostatic potential profile across the BaTiO₃ layer creates a quantum well and leads to the formation of a two-dimensional electron gas, which stabilizes the domain wall. The confined electronic states …