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説明:

In this Letter, we report the discovery of giant room-temperature odd-parity magnetoresistance (OMR) in a bilayer graphene heterostructure interfaced with Cr2⁢Ge2⁢Te6 (CGT). We show that the OMR is electrostatic gate-voltage tunable, exhibiting maximum value near the graphene band edges and diminishing rapidly with increasing charge carrier density. Our theoretical analysis reveals that the OMR originates from the coupling of out-of-plane components of Berry curvature and orbital magnetic moment with the applied magnetic field, signaling intrinsic time-reversal symmetry breaking in the system. This time-reversal symmetry breaking persists at room temperature within the CGT and bilayer graphene heterostructure despite the bulk CGT exhibiting ferromagnetic transition at 65 K. Our Letter opens new avenues for probing band geometric phenomena through magnetotransport measurements, especially in quantum materials where the anomalous Hall effects are immeasurably small due to the extrinsic scattering-dependent contributions canceling Berry curvature contributions.

権利情報:

• In Copyright
  

  © 2025 American Physical Society

キーワード: Bilayer graphene, Magnetoresistance, Berry curvature

刊行年月日: 2025-03-14

出版者: American Physical Society (APS)

掲載誌:

• Physical Review Letters (ISSN: 10797114) vol. 134 issue. 10 106301

研究助成金:

• Indian Institute of Technology Kanpur DST/NM/TUE/QM-6/2019(G)
• Japan Society for the Promotion of Science 19H05790
• Japan Society for the Promotion of Science 20H00354
• Japan Society for the Promotion of Science 21H05233
• Department of Science and Technology, Ministry of Science and Technology, India
• U.S. Army Combat Capabilities Development Command FA5209 22P0166
• Science and Engineering Research Board MTR/2019/001520

原稿種別: 著者最終稿 (Accepted manuscript)

MDR DOI:

公開URL: https://doi.org/10.1103/physrevlett.134.106301

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更新時刻: 2026-07-28 11:44:56 +0900

MDRでの公開時刻: 2026-07-28 14:26:08 +0900