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<p>We demonstrate electrically switchable, non-volatile dipoles in graphene/thin hBN/<i>α</i>-RuCl<sub>3</sub> heterostructures, stabilized purely by interfacial charge transfer across an atomically thin dielectric barrier. This mechanism requires no sliding or twisting to explicitly break inversion symmetry and produces robust ferroelectric-like hysteresis loops that emerge prominently near 30 K. Systematic measurements under strong in-plane and out-of-plane magnetic fields reveal negligible effects on the hysteresis characteristics, confirming that the primary mechanism driving the dipole switching is electrostatic. Our findings establish a distinct and robust route to electrically tunable ferroelectric phenomena in van der Waals heterostructures, opening opportunities to explore the interplay between interfacial charge transfer and temperature-tuned barrier crossing of dipole states at the atomic scale.</p>

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Ferroelectric switching of interfacial dipoles in α-RuCl3/graphene heterostructure

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年1月6日

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  • Soyun Kim,
  • Jo Hyun Yun,
  • Junsik Choe,
  • Dohun Kim,
  • Takashi Taniguchi,
  • Kenji Watanabe,
  • Joseph Falson,
  • Jun Sung Kim,
  • Kyung-Hwan Jin,
  • Gil Young Cho,
  • Youngwook Kim

摘要

We demonstrate electrically switchable, non-volatile dipoles in graphene/thin hBN/α-RuCl3 heterostructures, stabilized purely by interfacial charge transfer across an atomically thin dielectric barrier. This mechanism requires no sliding or twisting to explicitly break inversion symmetry and produces robust ferroelectric-like hysteresis loops that emerge prominently near 30 K. Systematic measurements under strong in-plane and out-of-plane magnetic fields reveal negligible effects on the hysteresis characteristics, confirming that the primary mechanism driving the dipole switching is electrostatic. Our findings establish a distinct and robust route to electrically tunable ferroelectric phenomena in van der Waals heterostructures, opening opportunities to explore the interplay between interfacial charge transfer and temperature-tuned barrier crossing of dipole states at the atomic scale.