Collective octahedral tilting in ultrathin Ruddlesden-Popper perovskite under terahertz light

Abstract

Perovskites have been applied in a wide range of fields such as solar cells and non-volatile memories due to their multiferroic nature and excellent photo-electric conversion capabilities. Recently, two-dimensional (2D) perovskites with a few atomic layers have been successfully synthesized, attracting significant attention for potential applications. In this work, we perform first-principles calculations to investigate an ultrathin prototypical Ruddlesden-Popper phase, ${\mathrm{Bi}}_2{\mathrm{FeO}}_4$, with its thickness down to one unit cell. We show that this compound could exist in two (meta-)stable octahedral tilting phases, belonging to $P{2}_1/c$ and $C2/m$ space groups, respectively. Using the optomechanical theory, we suggest that reversible and non-volatile phase switching can be triggered using non-destructive terahertz light. In addition, the two phases show distinct optical reflectance spectrum in the visible light range, which can be used as an optical probe for phase transformation. This enables both "write" and "read" in an all-optical route.

arXiv comment5 figures, accepted in Appl. Phys. Lett

References in corpus (10)

• Composition, structure and stability of RuO_2(110) as a function of oxygen pressure
• Distribution of phonon lifetime in Brillouin zone
• Systematic treatment of displacements, strains and electric fields in density-functional perturbation theory
• Implementation of the Projector Augmented Wave LDA+U Method: Application to the Electronic Structure of NiO
• First-principles, atomistic thermodynamics for oxidation catalysis
• Tuning the atomic and domain structure of epitaxial films of multiferroic BiFeO3
• Effects of the Hubbard U on density functional-based predictions of BiFeO${}_3$ properties
• Two-dimensional ferroelectricity induced by octahedral rotation distortion in perovskite oxides
• Intrinsic 1T' phase induced in atomically thin 2H-MoTe${}_2$ by a single terahertz pulse
• Renormalizing Antiferroelectric Nanostripes in ${\beta }^{\prime }-{\mathrm{In}}_2{\mathrm{Se}}_3$ via Optomechanics