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 a de Haas-van Alphen (dHvA) effect study on the Dirac type-IIsemimetallic candidates \emph{M}Al$_3$ (where, \emph{M} = V, Nb and Ta). Theangular-dependence of their Fermi surface (FS) cross-sectional areas reveals aremarkably good agreement with first-principle calculations. Therefore, dHvAsupports the existence of tilted Dirac cones with Dirac type-II nodes locatedat 100, 230 and 250 meV above the Fermi level $\varepsilon_F$ for VAl$_3$,NbAl$_3$ and TaAl$_3$ respectively, in agreement with the prediction of brokenLorentz invariance in these compounds. However, for all three compounds we findthat the cyclotron orbits on their FSs, including an orbit nearly enclosing theDirac type-II node, yield trivial Berry phases. We explain this $via$ ananalysis of the Berry phase where the position of this orbit, relative to theDirac node, is adjusted within the error implied by the small disagreementbetween our calculations and the experiments. We suggest that a very smallamount of doping could displace $\varepsilon_F$ to produce topologicallynon-trivial orbits encircling their Dirac node(s).

Bulk Fermi surfaces of the Dirac Type-II Semimetallic Candidates VAl3, NbAl3 and TaAl3