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(A) The transition from weakly to tightly bound pairs, depicted for V/Δ = 0.5 (left) and 10 (right), constitutes a probe of the BCS-BEC crossover at low doping. (B) Pair binding energy εb and bound state size as a function of V/Δ from the exact solution of the two fermion problem. The prediction of the continuum model (dashed line) perfectly matches the full-fledged lattice calculation, a stringent test of our derivation.
