We explore the role played by electron doping in the electronic structure and transport properties of tetragonal FeTe using the local density approximation plus dynamical mean-field theory treatment. Semiconducting and metal-insulator crossover behavior observed in a paramagnetic and strained FeTe superconductor are shown to be driven by the interplay between multiorbital electron interactions and doping-induced normal-state massive Dirac fermions. The doping-dependent self-energy pole structure we derive is promising in the sense that it leads to results that explain why moderate electron band filling can generate orbital-selective Dirac valleys with strong electron mass enhancement consistent with experiments.

• Received 31 October 2019
• Revised 27 January 2020
• Accepted 17 March 2020

DOI:https://doi.org/10.1103/PhysRevB.101.165107