Fig. 9

Glass coefficients. Measured (circles) and calculated (lines) Glass coefficients for various ferroelectric materials. The Weyl semimetal TaAs (blue square) exhibits a nearly one order of magnitude larger response due to its anomalous Berry curvature. TaAs works in the technically important mid-infrared regime due to its gapless nature. Figure is reproduced with permission from Ref. [197]. Copyright 2019 Springer Nature