Abstract Nanostructured superlattices are promising materials for novel electronic devices due to their adjustable physical properties. Periodic superlattices facilitate coherent phonon thermal transport due to constructive wave interference at the boundaries between the materials. However, it is possible to induce a crossover from coherent to incoherent transport regimes by adjusting the superlattice period. We have recently observed such crossover in periodic graphene-boron nitride nanoribbons as the length of individual domains was increased. In general, transport properties are dominated by translational symmetry and the presence of unconventional symmetries leads to unusual transport characteristics. Here we perform non-equilibrium molecular dynamics simulations to investigate phonon heat transport in graphene-hBN superlattices following the Fibonacci quasiperiodic sequence, which lie between periodic and disordered structures. Our simulations show that the quasiperiodicity can suppress coherent phonon thermal transport in these superlattices. This behavior is related to the increasing number of interfaces per unit cell as the Fibonacci generation increases, hindering phonon coherence along the superlattice. The suppression of coherent thermal transport in graphene-hBN superlattices enables a higher degree of control on heat conduction at the nanoscale, and shows potential for application in the design of novel thermal management devices.

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准周期石墨烯-hBN 超晶格带中相干热传输的抑制

摘要 纳米结构超晶格因其可调节的物理性质而成为用于新型电子器件的有前途的材料。由于材料之间边界处的相长波干涉，周期性超晶格促进相干声子热传输。然而，通过调整超晶格周期可以诱导从相干到非相干传输机制的交叉。我们最近在周期性石墨烯 - 氮化硼纳米带中观察到这种交叉，因为单个域的长度增加。一般来说，传输特性以平移对称性为主，非常规对称性的存在导致了不寻常的传输特性。在这里，我们执行非平衡分子动力学模拟，以研究遵循斐波那契准周期序列的石墨烯-hBN 超晶格中的声子热传输，该序列位于周期性和无序结构之间。我们的模拟表明，准周期性可以抑制这些超晶格中的相干声子热传输。这种行为与随着斐波那契代数的增加，每个晶胞的界面数量增加有关，阻碍了沿超晶格的声子相干性。石墨烯-hBN 超晶格中相干热传输的抑制能够在纳米尺度上对热传导进行更高程度的控制，并显示出在新型热管理设备设计中的应用潜力。我们的模拟表明，准周期性可以抑制这些超晶格中的相干声子热传输。这种行为与随着斐波那契代数的增加，每个晶胞的界面数量增加有关，阻碍了沿超晶格的声子相干性。石墨烯-hBN 超晶格中相干热传输的抑制能够在纳米尺度上对热传导进行更高程度的控制，并显示出在新型热管理设备设计中的应用潜力。我们的模拟表明，准周期性可以抑制这些超晶格中的相干声子热传输。这种行为与随着斐波那契代数的增加，每个晶胞的界面数量增加有关，阻碍了沿超晶格的声子相干性。石墨烯-hBN 超晶格中相干热传输的抑制能够在纳米尺度上对热传导进行更高程度的控制，并显示出在新型热管理设备设计中的应用潜力。