利用双层石墨烯的非线性导电性检测 Lifshitz 相变
摘要
二阶非线性电导响应 (NLER) 是失散对称性破缺系统的内在性质，可提供对原子薄 quantum materials 电子能带结构的深入见解。然而，Fermi 面重构，也称为 Lifshitz 相变，对 NLER 的影响尚不清楚。我们研究了双层石墨烯 (BLG) 中的 NLER，后者的低能带 undergoing Lifshitz 相变。在 BLG 中，NLER 在 Lifshitz 相变附近发生符号变化，即使在较高温度 K 也如此。在能带边上，BLG 的 NLER 受到 external scattering 和界面应变引起的内在 Berry 曲率偶极的调制，两者都可以通过调节掺杂和 interlayer potential 进行外部微调。能带边外，BLG 显示的 second-order conductivity 超过 mV at 3K，高于任何之前报告的值。我们的 work 确立了 NLER 作为探测 quantum materials 中 Lifshitz 相变的可靠工具。
引用
@article{arxiv.2507.05871,
title = {Detecting Lifshitz Transitions Using Nonlinear Conductivity in Bilayer Graphene},
author = {Tanweer Ahmed and Harsh Varshney and Bao Q. Tu and Kenji Watanabe and Takashi Taniguchi and Marco Gobbi and Fèlix Casanova and Amit Agarwal and Luis E. Hueso},
journal= {arXiv preprint arXiv:2507.05871},
year = {2025}
}
备注
This is the pre-peer reviewed version of the following article: Ahmed, T. et al., Small 2025, 21 (21), 2501426, which has been published in final form at https://doi.org/10.1002/smll.202501426. This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Use of Self-Archived Versions