功勋
热电效应
石墨烯
塞贝克系数
电压
材料科学
栅极电压
凝聚态物理
法诺平面
发电机(电路理论)
戒指(化学)
光电子学
物理
纳米技术
晶体管
功率(物理)
量子力学
几何学
数学
有机化学
化学
作者
M. Saiz-Bretín,А. В. Малышев,P. A. Orellana,F. Domı́nguez-Adame
标识
DOI:10.1103/physrevb.91.085431
摘要
We study the thermoelectric properties of rectangular graphene rings connected symmetrically or asymmetrically to the leads. A side-gate voltage applied across the ring allows for the precise control of the electric current flowing through the system. The transmission coefficient of the rings manifest Breit-Wigner line shapes and/or Fano line shapes, depending on the connection configuration, the width of nanoribbons forming the ring and the side-gate voltage. We find that the thermopower and the figure of merit are greatly enhanced when the chemical potential is tuned close to resonances. Such enhancement is even more pronounced in the vicinity of Fano-like antiresonances which can be induced by a side-gate voltage independently of the geometry. This opens a possibility to use the proposed device as a tunable thermoelectric generator.
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