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arXiv 1905.09660cond-mat.mes-hall
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扭曲双层石墨烯中的莫尔声子

Moiré phonons in the twisted bilayer graphene

Mikito Koshino, Young-Woo Son

摘要:

我们利用有效连续谱方法研究了扭曲双层石墨烯中的面内声学声子。我们通过求解三角畴结构静态弛豫态周围无限小振动的连续运动方程来计算声子模。我们发现,莫尔层间势只影响面内非对称模,即原来的线性色散被分解成由带隙隔开的微声子带,而面内对称模及其线性色散几乎不受影响.将非对称模的声子波函数视为畴壁网络的集体振动,用有效的莫尔尺度晶格模型定性描述低能声子能带结构.

英文摘要:

We study the in-plane acoustic phonons in twisted bilayer graphenes using the effective continuum approach. We calculate the phonon modes by solving the continuum equation of motion for infinitesimal vibration around the static relaxed state with triangular domain structure. We find that the moiré interlayer potential only affects the in-plane asymmetric modes, where the original linear dispersion is broken down into miniphonon bands separated by gaps, while the in-plane symmetric modes with their linear dispersion are hardly affected. The phonon wave functions of asymmetric modes are regarded as collective vibrations of the domain-wall network, and the low-energy phonon band structure can be qualitatively described by an effective moiré-scale lattice model.

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