Fig. 4: Theoretical understanding of the phase transition and its impact on Berry curvature dipole in ultrathin TaIrTe4. | Nature Communications

Fig. 4: Theoretical understanding of the phase transition and its impact on Berry curvature dipole in ultrathin TaIrTe4.

From: Probing interplay of topological properties and electron correlation in TaIrTe4 via nonlinear Hall effect

Fig. 4

a Calculated electronic susceptibility of the conduction band based on first-principles calculations (top). The white arrow highlights a local maximum of the electronic susceptibility at a wavevector \({\bf {Q}}^{*}\). It corresponds to a superlattice of about 15 unit cells along the one-dimensional Ta chain direction (bottom). Band structures with Berry curvature (\(\varOmega\)) under an electrical field of 0.1 V/nm, b without, and c with superlattice potential with a periodicity of 15 unit cells, show an enhanced Berry curvature near the CDW gap around 0.2 eV. d, e Corresponding momentum-resolved Berry curvature dipole (\({D}_{{{{\rm{ac}}}}}\)) at the energy level of 0.16 eV. Blue and red colors present positive and negative BCD amplitudes indicating that the BCD magnitude in these hotspots increases from \(2\times {10}^{3}\) in state I to \(4\times {10}^{4}\) in state II, representing a 20-fold enhancement.

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