通过准周期Su-Schrieffer-Heeger环中的电极耦合几何结构与磁通量实现巨热电性能的工程化
Engineering Giant Thermoelectric Performance through Electrode-Coupling Geometry and Magnetic Flux in Quasiperiodic Su-Schrieffer-Heeger Rings
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中文总结 AI 辅助
该研究通过非平衡格林函数方法，探究准周期SSH环的热电输运，利用电极耦合几何与磁通量调控，使非对称耦合下ZT达90，为高性能热电器件提供了工程策略。
中文摘要 AI 辅助
我们利用Landauer-Büttiker框架内的非平衡格林函数形式，研究了磁通量穿透的准周期Su-Schrieffer-Heeger（SSH）环中相干热电输运，该环具有经工程设计的多站点电极耦合。我们证明，电极耦合几何结构是调控量子干涉的有力控制参数，可重塑透射谱与热电响应。在无磁通量时，平凡二聚化相（t₁>t₂）展现出最高热电效率，非对称耦合产生的品质因数远大于对称几何结构。磁通量通过Aharonov-Bohm干涉进一步重构透射谱，驱动最优热电 regime 从平凡相到拓扑二聚化相的转变。在最优通量条件下，对称耦合的热电品质因数ZT≈12，非对称耦合因增强的能量过滤与受抑制的电子热输运，ZT显著提升至≈90。我们还确立了热电效率提升与Wiedemann-Franz定律违背之间的明确关联。研究结果表明，准周期性、拓扑、磁通量与电极耦合几何结构的协同作用，为高性能相干热电器件的工程化提供了通用策略。
英文摘要
We investigate coherent thermoelectric transport in magnetic-flux-threaded quasiperiodic Su-Schrieffer-Heeger (SSH) rings with engineered multi-site electrode couplings using the nonequilibrium Green's function formalism within the Landauer-Büttiker framework. We demonstrate that the electrode-coupling geometry serves as a powerful control parameter for tailoring quantum interference, thereby reshaping the transmission spectrum and thermoelectric response. In the absence of magnetic flux, the trivial dimerized phase ($t_1>t_2$) exhibits the highest thermoelectric efficiency, with asymmetric coupling producing a substantially larger figure of merit than the symmetric geometry. Magnetic flux further reconstructs the transmission spectrum through Aharonov-Bohm interference, driving a crossover of the optimal thermoelectric regime from the trivial to the topological dimerized phase. Under optimal flux conditions, the thermoelectric figure of merit reaches $ZT \approx 12$ for symmetric coupling and is dramatically enhanced to $ZT \approx 90$ for asymmetric coupling through enhanced energy filtering and suppressed electronic thermal transport. We further establish a clear correlation between the enhancement of thermoelectric efficiency and the violation of the Wiedemann-Franz law. Our results demonstrate that the combined interplay of quasiperiodicity, topology, magnetic flux, and electrode-coupling geometry provides a versatile strategy for engineering high-performance coherent thermoelectric devices.
发表机构
- School of Basic Sciences, Indian Institute of Technology Bhubaneswar（印度理工学院布巴内斯瓦尔基础科学学院）
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