Berry Curvature Dipole and Nonlinear Hall Effect in Type‐II Semi‐Dirac Systems DOI Open Access

Zi-Shan Liao,

Hui Zeng, Erqing Wang

et al.

Small, Journal Year: 2025, Volume and Issue: unknown

Published: March 16, 2025

Abstract The Berry curvature dipole (BCD) and the resulting nonlinear Hall effect have been investigated in various time‐reversal (TR) invariant but inversion‐breaking materials, where primary mechanisms are typically attributed to low‐energy Dirac models with tilt, Fermi surface (FS) warping, or semi‐Dirac dispersion quadratic momentum dependence one direction. This study proposes that a nonzero BCD arises special type‐II model formed by merging of three conventional points absence TR symmetry. this initially increases, then decreases, as chemical potential varies cones merge. non‐monotonic behavior is strongly linked evolution FS distribution density across different parameter regimes. Detailed comparison other further reveals distinct characteristics model. Additionally, it shown pair counterparts can exhibit net BCD, suggesting applications TR‐invariant materials. As concrete example, pronounced demonstrated bilayer graphene, achieved fine‐tuning interlayer sliding. These findings provide insights into materials establish foundation for exploring related systems.

Language: Английский

Berry Curvature Dipole and Nonlinear Hall Effect in Type‐II Semi‐Dirac Systems DOI Open Access

Zi-Shan Liao,

Hui Zeng, Erqing Wang

et al.

Small, Journal Year: 2025, Volume and Issue: unknown

Published: March 16, 2025

Abstract The Berry curvature dipole (BCD) and the resulting nonlinear Hall effect have been investigated in various time‐reversal (TR) invariant but inversion‐breaking materials, where primary mechanisms are typically attributed to low‐energy Dirac models with tilt, Fermi surface (FS) warping, or semi‐Dirac dispersion quadratic momentum dependence one direction. This study proposes that a nonzero BCD arises special type‐II model formed by merging of three conventional points absence TR symmetry. this initially increases, then decreases, as chemical potential varies cones merge. non‐monotonic behavior is strongly linked evolution FS distribution density across different parameter regimes. Detailed comparison other further reveals distinct characteristics model. Additionally, it shown pair counterparts can exhibit net BCD, suggesting applications TR‐invariant materials. As concrete example, pronounced demonstrated bilayer graphene, achieved fine‐tuning interlayer sliding. These findings provide insights into materials establish foundation for exploring related systems.

Language: Английский

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