Department of Physics, Karnatak University, Dharwad-580 003, Karnataka, India.
J Phys Condens Matter. 2011 Jul 13;23(27):275303. doi: 10.1088/0953-8984/23/27/275303. Epub 2011 Jun 23.
We calculate the phonon-drag thermopower S(g) of an armchair graphene nanoribbon (AGNR) in the boundary scattering regime of phonons. S(g) is studied as a function of temperature, Fermi energy and width of the AGNR. At very low temperatures T, S(g) is exponentially suppressed and an activated behavior is observed which is characteristic of one-dimensional carriers. This is in contrast to the power law dependence in graphene in the Bloch-Grüneisen regime. However, at higher T, S(g) in the AGNR levels off. S(g) also shows strong dependence on Fermi energy and width of the AGNR. The magnitude of S(g) in the AGNR is compared with that in single-wall carbon nanotube and graphene.
我们计算了在声子边界散射情况下扶手椅型石墨烯纳米带（AGNR）的声子拖拽热功率 S(g)。研究了 S(g) 随温度、费米能和 AGNR 宽度的变化。在非常低的温度 T 下，S(g) 呈指数衰减，并观察到与一维载流子特征一致的激活行为。这与布洛赫-格林艾森（Bloch-Grüneisen）区域内石墨烯中的幂律依赖性相反。然而，在更高的温度下，AGNR 中的 S(g) 趋于稳定。S(g) 还表现出对费米能和 AGNR 宽度的强烈依赖性。将 AGNR 中的 S(g) 与单壁碳纳米管和石墨烯中的 S(g) 进行了比较。
