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Giant Electrophononic Response in PbTiO_{3} by Strain Engineering
Pol Torres1, Jorge Íñiguez2,3, Riccardo Rurali1
1Institut de Ciència de Materials de Barcelona (ICMAB-CSIC), Campus de Bellaterra, 08193 Bellaterra, Barcelona, Spain.
Physical Review Letters
|November 26, 2019
Summary
We theoretically show that epitaxial strain in ferroelectric perovskites enables electric field control of phonon propagation. This strain induces a giant electrophononic response, significantly enhancing lattice thermal conductivity modulation.
Area of Science:
- Condensed Matter Physics
- Materials Science
- Solid-State Physics
Background:
- Ferroelectric perovskites exhibit unique electromechanical properties.
- Phonon propagation influences thermal conductivity.
- Controlling thermal transport with electric fields is a key challenge.
Purpose of the Study:
- To theoretically demonstrate dynamical control of phonon propagation using epitaxial strain and electric fields.
- To investigate the giant electrophononic response in ferroelectric perovskites.
- To analyze strain-induced manipulation of lattice structure and its effect on thermal conductivity.
Main Methods:
- Theoretical modeling of ferroelectric perovskites under epitaxial strain.
- Analysis of strain-induced lattice structure manipulation.
- Calculation of electrophononic response and its dependence on electric fields.
Main Results:
- Epitaxial strain enables dynamical control of phonon propagation via electric fields.
- Tensile biaxial strain induces a giant electrophononic response, over an order of magnitude larger than in unstrained systems.
- Near critical strains, spontaneous polarization rotation leads to a near-divergent electrical susceptibility and enhanced electrophononic effects.
Conclusions:
- Epitaxial strain offers a powerful route to achieve giant electrophononic effects in ferroelectric perovskites.
- This control mechanism allows for significant modulation of lattice thermal conductivity.
- The findings pave the way for novel electro-thermal devices.
