准周期梯形网络中的光谱工程和可调热电行为
Spectral engineering and tunable thermoelectric behavior in a quasiperiodic ladder network
摘要：
研究了双股准周期铜平均排列的电学性质和热电特性。双臂网络由紧束缚哈密顿量表示。这种不具有平移不变性的非周期网格的本征谱显著依赖于哈密顿量的参数。据观察，从现场能量和重叠积分矩阵之间的对易关系获得的参数之间的特定相关性，最终可以修改的光谱性质，并产生绝对连续的能量谱。这一部分是由非典型的扩展状态，有一个大的本地化长度证实连续的实空间重整化群方法步骤下的跳跃积分流。这听起来像是单粒子能态在这种非线性不变网络中的离域。此外，这可以通过选择性地选择参数的相对强度来随意设计。这种精确的相关性对热电行为有着至关重要的影响。热电系数的反常性质可能会启发实验学家设计可调谐热电器件。特定的相关性可以帮助我们随意调整连续带并确定带的位置。
英文摘要：
Double stranded quasiperiodic copper mean arrangement has been studied in respect of their electronic property and thermoelectric signature. The two-arm network is demonstrated by a tight binding Hamiltonian. The eigenspectrum of such aperiodic mesh that does not convey translational invariance, is significantly dependent on the parameters of the Hamiltonian. It is observed that specific correlation between the parameters obtained from the commutation relation between the on-site energy and overlap integral matrices can eventually modify the spectral nature and generate absolutely continuous energy spectrum. This part is populated by atypical extended states that has a large localization length substantiated by the flow of the hopping integral under successive real space renormalization group method steps. This sounds delocalization of single particle energy states in such nontranslationally invariant networks. Further this can be engineered at will by selective choice of the relative strengths of the parameters. This precise correlation has a crucial impact on the thermoelectric behavior. Anomalous nature of thermoelectric coefficient may inspire the experimentalists to frame tunable thermodevices. Specific correlations can help us to tune the continuous band and determine the band position at will.
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