Based on first-principles calculations and the Wannier-function-based tight-binding (WFTB) method, we investigate the topological electronic properties of designed noncentrosymmetric transition metal monochalcogenide superlattices AX/BX (A, B=Cr, Mo, W, A≠B; X=Se, Te). Here, we mainly consider Weyl semimetal (WSM) MoTe/WTe and MoSe/WSe and magnetic WSM CrTe/WTe and CrTe/MoTe, which are the time-reversal symmetrical and broken, respectively. The superlattices considered are nodal line semimetals with six nodal lines in the absence of spin-orbit coupling (SOC). When considering the SOC, each nodal line opens a gap except for some pairs of Weyl points (WPs) on the kz≠0 planes and the number of WPs is material-dependent. We identify the termination-dependent Fermi arc connection patterns on the (001) and (001 ̅) surfaces for four Weyl semimetal superlattices AX/BX. These results provide a theoretical basis to realize the possible applications of these superlattice materials in future topological electronic devices.
We investigate the Dirac-cone-like (DCL) topological electronic properties of nematic-like antiferromagnetic (AFM) states of monolayer FeSe and FeTe designed artificially through first-principles calculations and Wannier-function-based tight-binding (WFTB) method. Our calculations reveal most of them have a pair of DCL bands on the Γ-X line in the Brillouin zone (BZ) near the Fermi level and open a gap of about 20meV in the absence and presence of spin-orbit coupling (SOC), respectively, similar to the lowest-energy pair-checkerboard AFM FeSe. We further confirm that they are weak topological insulators based on nonzero Z2 and fragile surface states, which are calculated by the WFTB method. For FeSe and FeTe in pair-checkerboard AFM states, we find that the in-plane compression strain in a certain range can give rise to another pair of DCL bands located on the Γ-X line in the BZ. In addition, the magnetic moments, energies, and Fe-Se/Te distances for various nematic-like AFM configurations are presented. These calculations the combining effect of magnetism and topology in a single material and the understanding of the superconducting phenomena in iron-based FeSe and FeTe.
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