In the Purcell effect, the efficiency of optical emitters is enhanced by reducing the optical mode volume. Here we predict an analogous enhancement for electron–phonon (el-ph) scattering, achieved by compressing the electronic Wannier orbitals. Reshaped Wannier orbitals are a prominent attribute of graphene moiré superlattices, where the orbital size is tunable by the twist angle. A reduction in the orbital size leads to an enhancement in the el-ph interaction strength, yielding the values considerably larger than those in pristine monolayer graphene. The enhanced coupling boosts the el-ph scattering rates, pushing them above the values expected for the flat-band-enhanced density of electronic states. The enhanced phonon emission and scattering rates are manifested through the observables such as the electron–lattice cooling and the linear-temperature (T) resistivity, both of which are directly tunable by the moiré twist angle.

中文翻译：

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长周期超晶格中电子-声子相互作用的 Purcell 类增强：线性温度电阻率和冷却功率

在珀塞尔效应中，通过减小光模体积来提高光发射器的效率。在这里，我们预测了电子-声子 (el-ph) 散射的类似增强，这是通过压缩电子万尼尔轨道实现的。重塑的万尼尔轨道是石墨烯莫尔超晶格的一个突出属性，其中轨道尺寸可以通过扭曲角进行调节。轨道尺寸的减小导致 el-ph 相互作用强度的增强，产生的值远大于原始单层石墨烯中的值。增强的耦合提高了 el-ph 散射率，将它们推高到高于平带增强电子态密度的预期值。T ) 电阻率，两者均可通过莫尔扭曲角直接调节。