手性动力学多铁性在超快非手性电场非绝热驱动的铁电晶格中的涌现

中文摘要 AI 辅助

最近的研究表明，在手性光泵浦下，其电偶极子以无质量方式响应的铁电晶格可以产生手性动力学多铁性。本文证明，当由超快电脉冲驱动时，即使在外场是非手性的情况下，手性动力学多铁性也能涌现。我们使用BaTiO$_3$莫尔铁电晶格的原型系统揭示了这一显著现象，强调其关键因素在于其手性电偶极子在超快驱动下不可避免地表现为有质量行为。在更深层次上，这种有质量特性归因于各向异性和非绝热的偶极响应，这通过铁电极化的较快纵向分量与较慢横向分量之间的相位差来体现。至关重要的是，这种相位差自然也会产生动态磁化，表现出具有单极子类拓扑结构的手性磁纹理，与铁电手性共存。这些发现确立了偶极子质量作为诱导手性动力学多铁性的一个可调控自由度，为使用纯电探针实现超快、非接触磁控制提供了新途径。

英文摘要

It has been shown recently that chiral dynamical multiferroicity can be generated on a ferroelectric lattice whose electric dipoles respond masslessly under chiral optical pumping. Here we demonstrate that, when driven by ultrafast electric pulses, chiral dynamical multiferroicity can also emerge even in situations where the external field is achiral. We reveal this striking phenomenon using a prototypical system of a BaTiO$_3$ moiré ferroelectric lattice, emphasizing the key factor that its chiral electric dipoles inevitably behave massively upon ultrafast driving. At a deeper level, the massive nature is attributed to the anisotropic and nonadiabatic dipolar responses, as captured by the phase difference between the faster longitudinal and slower transverse components of the ferroelectric polarization. Crucially, such a phase difference naturally also gives rise to dynamical magnetization, which exhibits chiral magnetic textures with monopole-like topology coexisting with the ferroelectric chirality. These findings establish the dipolar mass as an enabling and tunable degree of freedom in inducing chiral dynamical multiferroicity, offering new avenues for ultrafast, non-contact magnetic control using pure electric probes.

发表机构

• University of Science and Technology of China（中国科学技术大学）

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