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 Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

We report on the experimental investigation of the dependence of the elasticenhancement, i.e., enhancement of scattering in backward direction overscattering in other directions of a wave-chaotic system with partially violatedtime-reversal (T ) invariance on its openness. The elastic enhancement factoris a characteristic of quantum chaotic scattering which is of particularimportance in experiments, like compound-nuclear reactions, where only crosssections, i.e., the moduli of the associated scattering matrix elements areaccessible. In the experiment a quantum billiard with the shape of a quarterbow-tie, which generates a chaotic dynamics, is emulated by a flat microwavecavity. Partial T-invariance violation of varying strength 0 < xi < 1 isinduced by two magnetized ferrites. The openness is controlled by increasingthe number M of open channels, 2 < M < 9, while keeping the internal absorptionunchanged. We investigate the elastic enhancement as function of xi and findthat for a fixed M it decreases with increasing time-reversal invarianceviolation, whereas it increases with increasing openness beyond a certain valueof xi > 0.2. The latter result is surprising because it is opposite to thatobserved in systems with preserved T invariance (xi = 0). We come to theconclusion that the effect of T -invariance violation on the elasticenhancement then dominates over the openness, which is crucial for experimentswhich rely on enhanced backscattering, since, generally, a decrease of theopenness is unfeasible. Motivated by these experimental results we,furthermore, performed theoretical investigations based on random matrix theorywhich confirm our findings.

How T-invariance violation leads to an enhanced backscattering with increasing openness of a wave-chaotic system