Li Jian-Gao, Guo Di, Li Yun-Mei, Chang Kai, Zhang Dong-Bo
School of Physics and Astronomy, Beijing Normal University, Beijing 100875, P.R. China.
Department of Physics, School of Physical Science and Technology, Xiamen University, Xiamen 361005, China.
Nano Lett. 2024 Sep 25;24(38):11847-11852. doi: 10.1021/acs.nanolett.4c02744. Epub 2024 Sep 12.
The pseudomagnetic field effect may offer unique opportunities for the emergence of intriguing phenomena. To date, investigations into pseudomagnetic field effects on phonons have been limited to sound waves in metamaterials. The revelation of this exotic effect on the atomic vibration of natural materials remains elusive. Our simulations of twisted graphene nanoribbons reveal well-defined Landau spectra and sublattice polarization of phonon states, mimicking the behavior of Dirac Fermions in magnetic fields. Both valley-specified helical edge currents and snake orbits are obtained. Analysis of dynamics indicates that phonon Landau states have extended lifetimes, which are crucial for the realization of Landau-level lasing. Our findings demonstrate the occurrence of the phonon pseudomagnetic field effect in natural materials, which has important implications for the mechanical tuning of phonon quantum states at the atomic scale.
赝磁场效应可能为有趣现象的出现提供独特机会。迄今为止，对赝磁场对声子影响的研究仅限于超材料中的声波。这种奇异效应在天然材料原子振动方面的揭示仍然难以捉摸。我们对扭曲石墨烯纳米带的模拟揭示了明确的朗道光谱和声子态的子晶格极化，模仿了狄拉克费米子在磁场中的行为。同时获得了谷特定的螺旋边缘电流和蛇形轨道。动力学分析表明，声子朗道态具有延长的寿命，这对于实现朗道能级激光至关重要。我们的研究结果证明了天然材料中声子赝磁场效应的存在，这对原子尺度上声子量子态的机械调谐具有重要意义。
