High three dimensional thermoelectric performance from low dimensional   bands
  Reduced dimensionality has long been regarded as an important strategy for increasing thermoelectric performance, for example in superlattices and other engineered structures. Here we point out and illustrate by examples that three dimensional bulk materials can be made to behave as if they were two dimensional from the point of view of thermoelectric performance. Implications for the discovery of new practical thermoelectrics are discussed. 
David Parker, Xin Chen and David J. Singh
cond-mat.mtrl-sci