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

A four-stroke quantum Otto engine can outperform when conducted between twothermal reservoirs, one at a positive spin temperature and the other one at aneffective negative spin temperature. Along with a magnetic field in the(x,y)-plane, we introduce an additional magnetic field in the z-direction. Wedemonstrate that the efficiency increases with the increase in the strength ofthe additional magnetic field although the impact is not monotonic.Specifically, we report a threshold value of the magnetic field, depending onthe driving time which exhibits a gain in efficiency. We argue that thisbenefit may result from the system being more coherent with driving time, whichwe assess using the l1-norm coherence measure. Moreover, we find that theincrement obtained in efficiency with an additional magnetic field endures evenin presence of disorder in parameter space.

Enhanced efficiency in quantum Otto engine via additional magnetic field and effective negative temperature