4.6 Article

Vertical transverse transport induced by hidden in-plane Berry curvature in two dimensions

Journal

PHYSICAL REVIEW B
Volume 104, Issue 8, Pages -

Publisher

AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.104.L081114

Keywords

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Funding

  1. KIST Institutional Program [2E31032]
  2. National Research Foundation of Korea (NRF) [2020R1C1C1012664, 2019M3F3A1A02071509]
  3. NRF grant - Korea government (MSIT) [2020R1F1A1048143]
  4. NRF [2021M3H4A1A03054864, 2019R1A2C1010498, 2017M3D1A1040833]
  5. National Research Foundation of Korea [2021M3H4A1A03054864, 2017M3D1A1040833, 2019R1A2C1010498, 2020R1F1A1048143, 2020R1C1C1012664] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)

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Research on modifying the definition of Berry curvature to explain vertical Hall effects and in-plane transport phenomena has important implications for quantum transport on two-dimensional platforms.
The discovery of Berry curvature (BC) has spurred a tremendous surge of research into various quantum phenomena such as the anomalous transport of electrons and the topological phases of matter. In two-dimensional crystalline systems, the conventional definition of the BC lacks the in-plane components and thus it cannot explain the transverse transport along the plane-normal direction. Here, we modify the BC to provide in-plane components in two dimensions, giving rise to the vertical Hall effects that describe out-of-plane transports in response to in-plane perturbations and their Onsager reciprocity. Our first-principles calculations show that a large in-plane BC can appear even in an atomic-thick GdAg2 monolayer, and a hexagonal BiAg2 monolayer can host a large BC dipole known to vanish in the conventional BC. The quantum transports driven by the hitherto-hidden BC will become more significant in recently emerging two-dimensional platforms, including van der Waals heterostructures.

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