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The crossover from Bardeen-Cooper-Schrieffer (BCS) superconductivity toBose-Einstein condensation (BEC) is difficult to realize in quantum materialsbecause, unlike in ultracold atoms, one cannot tune the pairing interaction. Werealize the BCS-BEC crossover in a nearly compensated semimetalFe$_{1+y}$Se$_x$Te$_{1-x}$ by tuning the Fermi energy, $\epsilon_F$, viachemical doping, which permits us to systematically change $\Delta /\epsilon_F$ from 0.16 to 0.5 were $\Delta$ is the superconducting (SC) gap. Weuse angle-resolved photoemission spectroscopy to measure the Fermi energy, theSC gap and characteristic changes in the SC state electronic dispersion as thesystem evolves from a BCS to a BEC regime. Our results raise importantquestions about the crossover in multiband superconductors which go beyondthose addressed in the context of cold atoms.

Tuning across the BCS-BEC crossover in the multiband superconductor Fe$_{1+y}$Se$_x$Te$_{1-x}$ : An angle-resolved photoemission study