Time-resolved PhotoEmission Spectroscopy on a Metal/Ferroelectric Heterostructure
发布时间：2025-04-30
点击次数：
- 发布时间：
- 2025-04-30
- 论文名称：
- Time-resolved PhotoEmission Spectroscopy on a Metal/Ferroelectric Heterostructure
- 发表刊物：
- Physical review. B, Condensed matter
- 摘要：
- In thin film ferroelectric capacitor the chemical and electronic structure of the electrode/FE interface can play a crucial role in determining the kinetics of polarization switching. We investigate the electronic structure of a Pt/BaTiO3/SrTiO3:Nb capacitor using time-resolved photoemission spectroscopy. The chemical, electronic and depth sensitivity of core level photoemission is used to probe the transient response of different parts of the upper electrode/ferroelectric interface to voltage pulse induced polarization reversal. The linear response of the electronic structure agrees quantitatively with a simple RC circuit model. The non-linear response due to the polarization switch is demonstrated by the time-resolved response of the characteristic core levels of the electrode and the ferroelectric. Adjustment of the RC circuit model allows a first estimation of the Pt/BTO interface capacitance. The experiment shows the interface capacitance is at least 100 times higher than the bulk capacitance of the BTO film, in qualitative agreement with theoretical predictions from the literature.
- 合写作者：
- J. E. Rault · G. Agnus · T. Maroutian · [6th Gang Niu] ·
- 是否译文：
- 否
- 发表时间：
- 2013-07-14