Bound states remain stable when their energy lies inside the reservoir band gap, and weak interactions make their lifetime finite but increasable by stronger system-reservoir coupling.
Altogether, we may expand for strong couplings the supersystem operators 12 in the supersystem eigenmodes as a+a † = X q Λ1q s Ω ϵq (cq +c † q) ≈ − ω1/4 c Γ1/4 (c1 +c † 1 +c 2 +c †
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Exploring bosonic bound states with parallel reaction coordinates
Bound states remain stable when their energy lies inside the reservoir band gap, and weak interactions make their lifetime finite but increasable by stronger system-reservoir coupling.