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arXiv 2603.26229cond-mat.mtrl-sci
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远红外波段中钡钛酸盐的光诱导应变与极化切换

Photoinduced strain and polarization switching in barium titanate in the far-infrared spectral range

Radboud University(拉德堡德大学);Radboud University, Institute for Molecules and Materials(拉德堡德大学分子与材料研究所)

Maarten Kwaaitaal, Daniel Lourens, Carl S. Davies, Andrei Kirilyuk

AI总结:

研究远红外激发下钡钛酸盐的应变和极化切换行为,发现其主要由光学吸收主导,而非长声子或介电接近零条件。

摘要:

短中红外激光脉冲有效促进铁电序参量的超快操控,包括磁化或铁电极化的完全反转,其机制与离子晶体中的极化声子性质相关。然而,关于此类序参量在远红外激发下的行为知之甚少,因为在远红外范围内声子更集体化且非极性。本文研究了由5-8 THz频率范围(35-60微米波长)激发驱动的铁电钡钛酸盐(BaTiO3)中的瞬态晶体学应变和极化切换行为。发现该切换在该范围的大部分区域持续存在,但主要由光学吸收主导,而非中红外范围内主导的长声子或介电接近零条件。

英文摘要:

Short mid-infrared laser pulses efficiently facilitate ultrafast manipulation of ferroic order parameters, including full reversal of magnetization or ferroelectric polarization, with the invoked mechanisms relating to the properties of polar phonons in ionic crystals. Much less is known, however, about the behaviour of such order parameters in response to an excitation in the far-infrared range, where phonons are more collective and less polar. Here we investigate transient crystallographic strains and polarization switching in ferroelectric barium titanate (BaTiO3) driven by an excitation in the frequency range of 5-8 THz, or wavelengths of 35-60 um. We find that switching persists in a large part of this range, but is governed primarily by optical absorption rather than by the longitudinal optical phonons or epsilon-near-zero conditions that dominate in the mid-infrared regime.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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