English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Plus monthly

Global: Zendy Tools annual

Global: Zendy Tools monthly

Global: Zendy Free Plan

We study the Casimir torque between two metallic one-dimensional gratingsrotated by an angle $\theta$ with respect to each other. We find that, forinfinitely extended gratings, the Casimir energy is anomalously discontinuousat $\theta=0$, due to a critical zero-order geometric transition between a 2D-and a 1D-periodic system. This transition is a peculiarity of the gratinggeometry and does not exist for intrinsically anisotropic materials. As aremarkable practical consequence, for finite-size gratings, the torque per areacan reach extremely large values, increasing without bounds with the size ofthe system. We show that for finite gratings with only 10 period repetitions,the maximum torque is already 60 times larger than the one predicted in thecase of infinite gratings. These findings pave the way to the design of acontactless quantum vacuum torsional spring, with possible relevance to micro-and nano-mechanical devices.

Giant Casimir torque between rotated gratings and the $\theta=0$ anomaly