Figure 1

(a) The staggered potential with checkerboard pattern, (c) stripe pattern, and [(b) and (d)] the band evolvements at TRIM with the potential strength corresponding to the patterns in (a) and (c), respectively. The open and filled circles on lattice sites in (a) and (c) represent on-site potentials with equal values but opposite signs. The new lattice vectors and new BZs are shown in (a) and (c) and the insets of (b) and (d). The blue (top) curve in (d) is a band evolving at other momenta that will determine the gap size at large potential strength. The range with vertical dashed lines in (b) and (d) marks the gap of the induced topological phase. The parameters are fixed for all calculations in this paper to be $A=36.45\hspace{0.5em}\mathrm{meV}$, $B=27.44\hspace{0.5em}\mathrm{meV}$, $D=20.48\hspace{0.5em}\mathrm{meV}$, and $M=1\hspace{0.5em}\mathrm{meV}$.Reuse & Permissions

Figure 2

One-dimensional energy bands with a strip geometry (shown in the inset) for (a) a checkerboard pattern and (b), (c), and (d) a stripe pattern. In (a) and (b), the energy bands are the same for the cases with the CDW and AF terms. (c) and (d) have different edges with (b), and the energy bands with the CDW term (c) are different from those with the AF term (d). A strip of width $N_y=60$ unit cell with open boundary conditions along $y$ and infinite along $x$ is used with the staggered potential strength $30\hspace{0.5em}\mathrm{meV}$, when the system is in the band-inverted phase.Reuse & Permissions

Figure 3

Conductance $G$ as a function of disorder strength $U_0$ and the Fermi level $E_F$. Each data point corresponds to a single disorder realization. (a)–(c) are the results with the CDW term, the AF terms in the $s_z$ and $s_x$ channels on the CSL strip respectively; (d)–(f) are corresponding results on the SSL1 strip. Here, the parameters are the same as those in Fig. 2, when the system shows the band-inverted phase in its clean form.Reuse & Permissions

Figure 4

One-dimensional energy bands with the AF term in the $s_x$ channel on a strip geometry (a) CSL, (b) SSL1, (c) SSL2. The parameters used here are the same as those in Fig. 2.Reuse & Permissions