• 文献标题:   Thermoelectric effect enhanced by resonant states in graphene
  • 文献类型:   Article
  • 作  者:   INGLOT M, DYRDAL A, DUGAEV VK, BARNAS J
  • 作者关键词:  
  • 出版物名称:   PHYSICAL REVIEW B
  • ISSN:   2469-9950 EI 2469-9969
  • 通讯作者地址:   Rzeszow Univ Technol
  • 被引频次:   7
  • DOI:   10.1103/PhysRevB.91.115410
  • 出版年:   2015

▎ 摘  要

Thermoelectric effects in graphene are considered theoretically with particular attention paid to the role of resonant scattering on impurities. Using the T-matrix method we calculate the impurity resonant states and the momentum relaxation time due to scattering on impurities. The Boltzmann kinetic equation is used to determine the thermoelectric coefficients. It is shown that the resonant impurity states near the Fermi level give rise to a resonant enhancement of the Seebeck coefficient and figure of merit ZT. The Wiedemann-Franz ratio deviates from that known for ordinary metals, where this ratio is constant and equal to the Lorentz number. This deviation appears for small chemical potentials and in the vicinity of the resonant states. In the limit of a constant relaxation time, this ratio has been calculated analytically for mu = 0.