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

Based on first-principles calculations and an effective Hamiltonian analysis,we systematically investigate the electronic and topological properties ofalkaline-earth compounds $AX_2$ ($A$=Ca, Sr, Ba; $X$=Si, Ge, Sn). TakingBaSn$_2$ as an example, we find that when spin-orbit coupling is ignored, thesematerials are three-dimensional topological nodal-line semimetals characterizedby a snake-like nodal loop in three-dimensional momentum space. Drumhead-likesurface states emerge either inside or outside the loop circle on the (001)surface depending on surface termination, while complicateddouble-drumhead-like surface states appear on the (010) surface. Whenspin-orbit coupling is included, the nodal line is gapped and the systembecomes a topological insulator with Z$_2$ topological invariants (1;001).Since spin-orbit coupling effects are weak in light elements, the nodal-linesemimetal phase is expected to be achievable in some alkaline-earth germanidesand silicides.

Topological nodal-line semimetals in alkaline-earth stannides, germanides and silicides