Non-monotonic band flattening near the magic angle of twisted bilayer MoTe$_2$
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| Autores principales: | , , , , , , , , , , , , , , , |
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| Formato: | Preprint |
| Publicado: |
2025
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| _version_ | 1866913097757753344 |
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| author | Deng, Yujun Holtzmann, William Zhu, Ziyan Zaklama, Timothy Majchrzak, Paulina Taniguchi, Takashi Watanabe, Kenji Hashimoto, Makoto Lu, Donghui Jozwiak, Chris Bostwick, Aaron Rotenberg, Eli Fu, Liang Devereaux, Thomas P. Xu, Xiaodong Shen, Zhi-Xun |
| author_facet | Deng, Yujun Holtzmann, William Zhu, Ziyan Zaklama, Timothy Majchrzak, Paulina Taniguchi, Takashi Watanabe, Kenji Hashimoto, Makoto Lu, Donghui Jozwiak, Chris Bostwick, Aaron Rotenberg, Eli Fu, Liang Devereaux, Thomas P. Xu, Xiaodong Shen, Zhi-Xun |
| contents | Twisted bilayer MoTe$_2$ (tMoTe$_2$) 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 (ARPES) measurements of tMoTe$_2$, revealing pronounced twist-angle-dependent band reconstruction shaped by orbital character, interlayer coupling, and moiré potential modulation. Density functional theory (DFT) 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 non-monotonic 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 tMoTe$_2$ as a direct band gap semiconductor. These results establish a spectroscopic foundation for modeling and engineering emergent quantum phases in this moiré platform. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2509_08993 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Non-monotonic band flattening near the magic angle of twisted bilayer MoTe$_2$ Deng, Yujun Holtzmann, William Zhu, Ziyan Zaklama, Timothy Majchrzak, Paulina Taniguchi, Takashi Watanabe, Kenji Hashimoto, Makoto Lu, Donghui Jozwiak, Chris Bostwick, Aaron Rotenberg, Eli Fu, Liang Devereaux, Thomas P. Xu, Xiaodong Shen, Zhi-Xun Mesoscale and Nanoscale Physics Materials Science Strongly Correlated Electrons Twisted bilayer MoTe$_2$ (tMoTe$_2$) 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 (ARPES) measurements of tMoTe$_2$, revealing pronounced twist-angle-dependent band reconstruction shaped by orbital character, interlayer coupling, and moiré potential modulation. Density functional theory (DFT) 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 non-monotonic 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 tMoTe$_2$ as a direct band gap semiconductor. These results establish a spectroscopic foundation for modeling and engineering emergent quantum phases in this moiré platform. |
| title | Non-monotonic band flattening near the magic angle of twisted bilayer MoTe$_2$ |
| topic | Mesoscale and Nanoscale Physics Materials Science Strongly Correlated Electrons |
| url | https://arxiv.org/abs/2509.08993 |