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TT: Fachverband Tiefe Temperaturen

TT 65: 2D materials: Stacking and heterostructures – Poster (joint session O/TT)

TT 65.7: Poster

Mittwoch, 11. März 2026, 18:00–20:00, P2

Valence-Band Renormalization and Spin Splitting in a Monolayer WTe2/WSe2 Heterostructure — •Daiyu Geng, Natalie Lehmann, Jiabao Yang, and Niels Schröter — Max Planck Institute of Microstructure Physics, Weinberg 2, Halle (Saale), Germany

Monolayer WTe2 (1L-WTe2) hosts a variety of broken-symmetry phases, including a quantum spin Hall insulator, a topological excitonic insulator, and several intriguing spin-ordered states. The dielectric environment and charge-carrier density play crucial roles in the competition among these electronic phases. In this work, we investigate the band structure of 1L-WTe2 interfaced with semiconducting WSe2 using laser- and synchrotron-based micro-ARPES. We observe strong valence-band renormalization accompanied by pronounced spin splitting in 1L-WTe2. Additionally, multiple replica pockets emerging in the Fermi surface indicate a substantial moiré effect in this heterostructure.

Keywords: Monolayer WTe2; Heterostructure; Moiré modulation; Symmetry breaking