"Domain walls in 2D monochalcogenide ferroelectrics"

Who: Urko Petralanda

Place: Hybrid Seminar, Donostia International Physics Center

Date: Friday, 27 May 2022, 12:00

Monolayer ferroelectric materials have emerged as a promising avenue for miniaturization of electronic devices, and as potential candidate materials for future photovoltaics or thermoelectrics. The properties of ferroelectrics are strongly influenced by the presence of domain walls (DWs), but a detailed theoretical understanding of their role in polarization switching and influence on optical properties is still lacking in two-dimensional materials. After a brief introduction of domain walls in ferroelectrics, in this talk I will present our first principles calculations on the structural, optical and dynamical properties of 90 and 180 degree DWs in 2D monochalcogenides. I will mainly focus on the thermodynamic model we have developed for the study of the propagation of domain walls under an external electric field. Our calculations show that the sole consideration of DW propagation can explain the low coercive field experimentally observed in few-monolayer SnS, which points toward a DW migration driven polarization switching in this family of materials.

Bio (Urko Petralanda)

He did his PhD in the University of the Basque Country with Prof Iñigo Etxebarria, studying phase transitions in ferroelectrics in the framework of the Landau theory of phase transitions. Then, he did a short post-doctoral stay at the dielectrics department in the Institute of Physics of the Czech Academy of Sciences. He later moved to the Italian institute of Technology for a postdoc position in the Quantum Materials Theory group, and subsequently to the Nanochemistry group led by Prof Liberato Manna, at the same institution. From there, moved to Denmark to join the Computational Atomic Scale Design section, at the physics department of the Technical University of Denmark, to work with Prof Thomas Olsen. Finally, since April this year he is a María Zambrano fellow at the physics department of the EHU.

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