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Optical second harmonic signature of phase coexistence in ferroelectric|dielectric heterostructures

Accepted version
Peer-reviewed

Type

Article

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Abstract

An exotic coexistence of polar states is known to occur in ferroelectric|dielectric PbTiO3|SrTiO3 (PTO|STO) heterostructures. In the PTO layers with a thickness of 10–20 unit cells, in-planepolarized regions order alongside the so-called vortex phase with a whirl-like arrangement of electric dipoles. We investigate the optical signature of these polar phases non-invasively using optical second harmonic generation (SHG) on PTO|STO-based heterostructures. We identify the phase coexistence down to a single PTO|STO bilayer. By comparing the SHG yield in dependence of the number of PTO layers, we further find that interlayer coupling plays an important role in setting the final polarization state. Our non-linear optical experiments demonstrate the potential of this non-invasive approach for the identification and understanding of complex non-collinear ordering of dipole moments in oxide heterostructures and lays the groundwork for their operando investigation.

Description

Keywords

5108 Quantum Physics, 40 Engineering, 51 Physical Sciences

Journal Title

Physical Review B

Conference Name

Journal ISSN

2469-9950
2469-9969

Volume Title

105

Publisher

American Physical Society (APS)