Chiral Phonons in Moiré Superlattices,Nano Letters

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Chiral Phonons in Moiré Superlattices
Nano Letters ( IF 9.6 ) Pub Date : 2021-11-16 , DOI: 10.1021/acs.nanolett.1c03692
Nishchay Suri ₁ , Chong Wang ₂ , Yinhan Zhang ₁ , Di Xiao _{2,

3}

Affiliation

We discover chiral phonons at the lowest energy bands in moiré superlattices. The moiré chiral phonons we uncover are the collective excitations of the stacking domains. Their origin is uniquely attributed to the stacking configurations whose interlayer binding energy breaks the C_2z symmetry on the moiré length scale. Within elastic theory, we use a general symmetry analysis to provide a complete classification of van der Waals heterostructures in respect to hosting moiré chiral phonons and show the calculation for twisted MoS₂ as an example. We present a low-energy effective model to qualitatively understand the moiré chiral phonons and show that it captures the essential physics remarkably well. Our result potentially opens up new possibilities in phononic twistronics as the moiré chiral phonons have high tunability, moiré scale wavelengths, excitation energies in only a few meV and can possibly be mechanically excited.

中文翻译：

莫尔超晶格中的手征声子

我们在莫尔超晶格的最低能带处发现了手性声子。我们发现的莫尔手征声子是堆叠域的集体激发。它们的起源独特地归因于堆叠配置，其层间结合能破坏了莫尔长度尺度上的C _{2 z}对称性。在弹性理论中，我们使用一般的对称性分析来提供范德华异质结构的完整分类，关于托管莫尔手性声子，并显示扭曲的 MoS ₂的计算举个例子。我们提出了一个低能量有效模型来定性地理解莫尔手性声子，并表明它非常好地捕捉了基本物理。我们的结果可能为声子扭曲电子学开辟了新的可能性，因为莫尔手性声子具有高可调性、莫尔尺度波长、仅几 meV 的激发能量，并且可能被机械激发。

更新日期：2021-12-08

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