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  • Letter

Spin-valley 0.7 anomaly in bilayer graphene/WSe2 quantum point contacts

Jonas D. Gerber1,*, Efe Ersoy1, Michele Masseroni1, Markus Niese1, Artem O. Denisov1, Christoph Adam1, Lara Ostertag1, Jessica Richter1, Takashi Taniguchi2 et al.

Kenji Watanabe3, Yigal Meir4, Thomas Ihn1, and Klaus Ensslin1

  • *Contact author: gerberjo@phys.ethz.ch

Phys. Rev. B 114, L111401 – Published 3 August, 2026

DOI: https://doi.org/10.1103/zss4-lmlm

Abstract

We report a well-resolved 0.7 conductance anomaly at G=0.7×(2e2/h) in bilayer graphene/WSe2 quantum point contacts. Proximity-enhanced spin-orbit coupling splits the fourfold ground state of bilayer graphene into well-separated spin-valley locked Kramers doublets. The anomaly emerges between these opposite spin-valley states. Despite fundamentally different band structure and wave function characteristics, the temperature and bias phenomenology closely mirror GaAs systems. In contrast, the parallel magnetic field response differs significantly, confirming the central role of valley degrees of freedom. This opens new pathways to study valley-exchange correlation physics in regimes inaccessible to conventional semiconductors.

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