Domain walls in 2D monochalcogenide ferroelectrics
DIPC Seminars
- Speaker
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Urko Petralanda
- When
-
2022/05/27
14:00 - Place
- Hybrid Seminar, Donostia International Physics Center
- Add to calendar
-
iCal
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.
Host: Andres Ayuela
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