Nonmonotonic Band Flattening near the Magic Angle of Twisted Bilayer                    <math display=

Yujun Deng; William Holtzmann; Ziyan Zhu; Timothy Zaklama; Paulina Majchrzak; Takashi Taniguchi; Kenji Watanabe; Makoto Hashimoto; Donghui Lu; Chris Jozwiak; Aaron Bostwick; Eli Rotenberg; Liang Fu; Thomas P. Devereaux; Xiaodong Xu; Zhi-Xun Shen

doi:10.1103/q11l-9jy1

ジャーナル論文 Nonmonotonic Band Flattening near the Magic Angle of Twisted Bilayer ${MoTe}_{2}$

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Yujun Deng, William Holtzmann, Ziyan Zhu, Timothy Zaklama, Paulina Majchrzak, Takashi Taniguchi, Kenji Watanabe, Makoto Hashimoto, Donghui Lu, Chris Jozwiak, Aaron Bostwick, Eli Rotenberg, Liang Fu, Thomas P. Devereaux, Xiaodong Xu, Zhi-Xun Shen. Nonmonotonic Band Flattening near the Magic Angle of Twisted Bilayer

{MoTe}_{2}

. Physical Review X. 2025, 15 (4), 041043. https://doi.org/10.1103/q11l-9jy1

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(abstract)

Twisted bilayer MoTe2 has recently emerged as a versatile platform for exploring exotic quantum phases, including integer and fractional quantum anomalous Hall and fractional quantum spin Hall states, driven by the interplay of nontrivial band topology and strong electron correlations. Direct experimental access to its momentum-resolved electronic structure is essential for uncovering the microscopic origins of these correlated topological phases. Here, we report angle-resolved photoemission spectroscopy measurements of twisted bilayer MoTe2, 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 at larger twist angles, highlighting the importance of electronic correlations. Notably, the hole effective mass at the K valley exhibits a non-monotonic dependence on twist angle, peaking near 2°, consistent with band flattening at the magic angle predicted by continuum models. By benchmarking them against experimental input, we refine the theoretical description of twisted bilayer MoTe2. Finally, we demonstrate tunable electronic structure via electrostatic gating and surface dosing, enabling direct observation of the conduction band minimum to confirm a direct band gap in tMoTe2. These results establish a spectroscopic foundation for modeling and engineering emergent quantum phases in this moiré platform.

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