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Recently reported quasiparticle interference imaging in underdopedCa(Fe{1-x}Co{x})_2As{2} shows pronounced C{2} asymmetry that is interpreted asan indication of an electronic nematic phase with a unidirectional electronband, dispersive predominantly along the $b$-axis of this orthorhombicmaterial. On the other hand, even more recent transport measurements onuntwinned samples show near isotropy of the resistivity in the $ab$ plane, withslightly larger conductivity along a (and not b). We show that in fact bothsets of data are consistent with the calculated ab initio Fermi surfaces, whichhas a decisively broken C_{4}, and yet similar Fermi velocity in bothdirections. This reconciles completely the apparent contradiction between theconclusions of the STM and the transport experiments.

Quasiparticle interference in antiferromagnetic parent compounds of Fe-based superconductors