Nodal-line semimetal superlattices

Area of Science:

• Condensed matter physics
• Materials science

Background:

• Topological materials are actively researched using spatial modulations like superlattices.
• Nodal-line semimetals and normal insulators are key material classes for exploring novel topological properties.

Purpose of the Study:

• Investigate the properties of superlattices formed by nodal-line semimetals and normal insulators.
• Analyze the impact of stacking direction and magnetization on the topological phases.

Main Methods:

• Theoretical investigation of superlattice structures.
• Analysis of band structures and topological phase transitions.

Main Results:

• Superlattices with stacking parallel to the nodal line plane preserve nodal lines but alter their shapes due to Brillouin zone folding.
• Magnetization can induce topological phases: Weyl semimetal or quantum anomalous Hall (QAH) phases, depending on magnetization direction relative to symmetry axes.

Conclusions:

• Superlattices offer a route to engineer topological materials.
• The interplay of spatial modulation and magnetization provides control over emergent topological phases like QAH and Weyl semimetals.