The combination of chirality and magnetism has steadily grown over the last decennia into an area of intense research. Magnetochiral anisotropy, chirality-induced spin-selectivity and helimagnetism are the most prominent phenomena resulting from this combination, touching different systems like topological (semi-)metals and insulators, quantum magnets, type II multiferroics and enantio-selective synthesis. As an extension to this area, we argue, based on symmetry arguments, that magnetochiral anisotropy will manifest itself in the displacement current in chiral dielectrics in a magnetic field. We confirm this conjecture by the experimental observation of very strong dielectric magnetochiral anisotropy near the ferroelectric phase transitions of triglycine sulfate and Rochelle salt, two of the oldest and most investigated chiral ferroelectrics. This effect opens a new playground in the study and characterisation of all chiral dielectrics. With our discovery, magnetochiral anisotropy now covers the (di)electrical properties of all condensed matter, from insulators to superconductors.

在过去的几十年里，手性和磁性的结合稳步发展成为一个深入研究的领域。手性磁各向异性、手性诱导的自旋选择性和螺旋磁性是这种组合产生的最突出的现象，涉及不同的系统，如拓扑（半）金属和绝缘体、量子磁体、II 型多铁性和对映选择性合成。作为该领域的扩展，我们基于对称性论证认为，磁手性各向异性将表现在磁场中手性电介质的位移电流中。我们通过实验观察到硫酸三甘氨酸和罗谢尔盐（两种最古老和研究最多的手性铁电体）的铁电相变附近的非常强的介电磁手性各向异性来证实这一猜想。这种效应为所有手性电介质的研究和表征开辟了一个新的领域。随着我们的发现，磁手性各向异性现在涵盖了所有凝聚态物质的（二）电特性，从绝缘体到超导体。