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Paper   IPM / Nano-Sciences / 14434
School of Nano Science
  Title:   Thermoelectric effects in topological crystalline insulators
1.  Babak Zare Ramashti
2.  Reza Asgari
  Status:   Published
  Journal: Phys. Rev. B
  No.:  20
  Vol.:  94
  Year:  2016
  Pages:   205401
  Publisher(s):   American Physical Society
  Supported by:  IPM
We investigate the electrical conductivity and thermoelectric effects in topological crystalline insulators (TCIs) in the presence of short- and long-range impurity interactions. We employ the generalized Boltzmann formalism for anisotropic Fermi surface systems. The conductivity exhibits a local minimum as doping varies owing to the Van Hove singularity in the density of states originated from the saddle point in the surface states band structure. Suppression of the inter-band scattering of the charge carriers at high-energy Dirac points results in a maximum in the electrical conductivity. Whenever the Fermi level passes an extremum in the conductivity, Seebeck coefficient changes sign. In addition, it is revealed that profound thermoelectric effects can be attained around these exterma. Having investigated the Seebeck effect and a significantly large figure of merit, we suggest TCIs as a promising material for caloritronics studies and applications.

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