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Events Calendar

Highly tunable ferroelectricity and ionic states in layered perovskites

Date and Time: Wednesday, November 02, 2022, 03:30pm - 04:30pm
Location: 330W and via Zoom

Speaker: Xianghan Xu, Princeton University


Abstract: Ferroelectricity was first discovered in 1920. The intrinsic binary states and the electrically switchable nature enable wide applications of ferroelectric materials in electronics. More than 100 years later, the investigation of new ferroelectrics, unconventional ferroelectric mechanisms, and the coupling between ferroelectricity with other physical properties are still attracting huge research interests for achieving next-generation quantum devices.

In the first section of my talk, hybrid improper mechanism which can produce ferroelectricity in layered perovskite will be introduced. Experimental examples of ferroelastic-coupled hybrid improper ferroelectrics and the interplay between switching barrier and microscopic lattice modes will be illustrated. In the next section, I will show that by introducing alkali metal ions into the layered perovskite lattice, a single-phase material could act as a ferroelectric insulator or an ionic conductor in different temperature and frequency regimes. In the last section, I will talk about my ongoing projects inspired by the multifunctional behaviors of layered materials containing alkali metal ions.


Host:  Kristjan Haule