Nonmonotonic Band Flattening near the Magic Angle of Twisted Bilayer MoTe2
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q11l-9jy1.pdf
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Published version
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2.36 MB
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Author(s)
Deng, Yujun
Holtzmann, William
Zhu, Ziyan
Zaklama, Timothy
Majchrzak, Paulina
Taniguchi, Takashi
Watanabe, Kenji
Hashimoto, Makoto
Lu, Donghui
Jozwiak, Chris
Date Issued
October 29, 2025
Journal
Physical Review X
Publisher
American Physical Society (APS)
Citation
Deng, Yujun, Holtzmann, William, Zhu, Ziyan, Zaklama, Timothy, Majchrzak, Paulina et al. 2025. "Nonmonotonic Band Flattening near the Magic Angle of Twisted Bilayer MoTe2." Physical Review X, 15 (4).
Version
Final published version
Abstract
Twisted bilayer MoTe2 (tMoTe2) is an emergent platform for exploring exotic quantum phases driven by the interplay between nontrivial band topology and strong electron correlations. Direct experimental access to its momentum-resolved electronic structure is essential for uncovering the microscopic origins of the correlated topological phases therein. Here, we report angle-resolved photoemission spectroscopy measurements of tMoTe2, revealing pronounced twist-angle-dependent band reconstruction shaped by orbital character, interlayer coupling, and moiré potential modulation. Density functional theory captures the qualitative evolution, yet underestimates key energy scales across twist angles, highlighting the importance of electronic correlations. Notably, the hole effective mass at the 𝐾 point exhibits a nonmonotonic dependence on twist angle, peaking near 2°, consistent with band flattening at the magic angle predicted by continuum models. Via electrostatic gating and surface dosing, we further visualize the evolution of electronic structure versus doping, enabling direct observation of the conduction band minimum and confirm tMoTe2 as a direct band gap semiconductor. These results establish a spectroscopic foundation for modeling and engineering emergent quantum phases in this moiré platform.
MIT Department
Massachusetts Institute of Technology. Department of Physics
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DOI of Published Version
https://doi.org/10.1103/q11l-9jy1
