Berry curvature dipole and nonlinear Hall effect in two-dimensional Nb${}_{2n+1}$Si${}_n$Te${}_{4n+2}$

Abstract

Recent experiments have demonstrated interesting physics in a family of two-dimensional (2D) composition-tunable materials Nb${}_{2n+1}$Si${}_n$Te${}_{4n+2}$. Here, we show that owing to its intrinsic low symmetry, metallic nature, tunable composition, and ambient stability, these materials offer a good platform for studying Berry curvature dipole (BCD) and nonlinear Hall effect. Using first-principles calculations, we find that BCD exhibits pronounced peaks in monolayer Nb${}_3$SiTe${}_6$ ($n=1$ case). Its magnitude decreases monotonically with $n$ and completely vanishes in the $n\to \infty$ limit. This variation manifests a special hidden dimensional crossover of the low-energy electronic states in this system. The resulting nonlinear Hall response from BCD in these materials is discussed. Our work reveals pronounced geometric quantities and nonlinear transport physics in Nb${}_{2n+1}$Si${}_n$Te${}_{4n+2}$ family materials, which should be readily detected in experiment.

8 pages, 7 figures and 1 table

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