التفاصيل البيبلوغرافية
| العنوان: |
Linear resistivity at van Hove singularities in twisted bilayer WSe2. |
| المؤلفون: |
LingNan Wei, Qiaoling Xu, Yangchen He, Qingxin Li, Yan Huang, Wang Zhu, Kenji Watanabe, Takashi Taniguchi, Claassen, Martin, Rhodes, Daniel A., Kennes, Dante M., Lede Xian, Rubio, Angel, Lei Wang |
| المصدر: |
Proceedings of the National Academy of Sciences of the United States of America; 4/16/2024, Vol. 121 Issue 16, p1-6, 14p |
| مصطلحات موضوعية: |
METAL-insulator transitions, FERMI liquids, CRITICAL point (Thermodynamics), MAGNETIC fields |
| مستخلص: |
Different mechanisms driving a linear temperature dependence of the resistivity ρ ~ T at van Hove singularities (VHSs) or metal-insulator transitions when doping a Mott insulator are being debated intensively with competing theoretical proposals. We experimentally investigate this using the exceptional tunability of twisted bilayer (TB) WSe2 by tracking the parameter regions where linear-in-T resistivity is found in dependency of displacement fields, filling, and magnetic fields. We find that even when the VHSs are tuned rather far away from the half-filling point and the Mott insulating transition is absent, the T-linear resistivity persists at the VHSs. When doping away from the VHSs, the T-linear behavior quickly transitions into a Fermi liquid behavior with a T² relation. No apparent dependency of the linear-in-T resistivity, besides a rather strong change of prefactor, is found when applying displacement fields as long as the filling is tuned to the VHSs, including D ~ 0.28 V/nm where a high-order VHS is expected. Intriguingly, such non-Fermi liquid linear-in-T resistivity persists even when magnetic fields break the spin-degeneracy of the VHSs at which point two linear in T regions emerge, for each of the split VHSs separately. This points to a mechanism of enhanced scattering at generic VHSs rather than only at high-order VHSs or by a quantum critical point during a Mott transition. Our findings provide insights into the many-body consequences arising out of VHSs, especially the non-Fermi liquid behavior found in moiré materials. [ABSTRACT FROM AUTHOR] |
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| قاعدة البيانات: |
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