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We report on a band structure calculation and de Haas-van Alphen measurementsof KFe$_2$As$_2$. Three cylindrical Fermi surfaces are found. Effective massesof electrons range from 6 to 18$m_e$, $m_e$ being the free electron mass.Remarkable discrepancies between the calculated and observed Fermi surfaceareas and the large mass enhancement ($\gtrsim 3$) highlight the importance ofelectronic correlations in determining the electronic structures of ironpnicitide superconductors.

Fermi surface and mass enhancement in KFe$_2$As$_2$ from de Haas-van Alphen effect measurements