论文标题
由于石墨烯解毒剂晶格中的对称性破裂引起的尺寸交叉和增强的热电效率
Dimensional crossover and enhanced thermoelectric efficiency due to broken symmetry in graphene antidot lattices
论文作者
论文摘要
石墨烯解毒剂晶格（GALS）是二维（2D）单层，在原始石墨烯中定期放置孔。我们研究了具有六边形孔的对称和非对称GAL结构的电子特性，并表明各向异性2D GAL可以显示一个维跨界，因此可以在电荷中性点周围有效地实现一维（1D）电子结构。我们使用非平衡绿色功能（NEGF）方法研究了这些2D GAL的传输和热电特性。尺寸的跨界车是传输高原，这是1D系统的特征，以及增强热电效率的特征，在室温下，绩效$ ZT $的热电图可以高达0.9。我们还研究了在安德森障碍存在下的运输特性，并发现有效的各向异性构型的1D电子的自由途径比其各向同性对应物长得多。我们进一步认为，由于对称性断裂和热电效率的增强而导致的尺寸交叉实际上可能是所有2D材料的纳米结构策略。
Graphene antidot lattices (GALs) are two-dimensional (2D) monolayers with periodically placed holes in otherwise pristine graphene. We investigate the electronic properties of symmetric and asymmetric GAL structures having hexagonal holes, and show that anisotropic 2D GALs can display a dimensional crossover such that effectively one-dimensional (1D) electronic structures can be realized in two-dimensions around the charge neutrality point. We investigate the transport and thermoelectric properties of these 2D GALs by using non-equilibrium Green function (NEGF) method. Dimensional crossover manifests itself as transmission plateaus, a characteristic feature of 1D systems, and enhancement of thermoelectric efficiency, where thermoelectric figure of merit, $zT$, can be as high as 0.9 at room temperature. We also study the transport properties in the presence of Anderson disorder and find that mean free paths of effectively 1D electrons of anisotropic configuration are much longer than their isotropic counterparts. We further argue that dimensional crossover due to broken symmetry and enhancement of thermoelectric efficiency can be nanostructuring strategy virtually for all 2D materials.
