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Yale researchers have experimentally validated the emergence and breakdown of Fermi's Golden Rule within strongly interacting quantum many-body systems using Quantum Spectral Functions. By mapping transition probabilities across different pulse durations and coupling strengths, this work clarifies how linear response theory applies to complex spectroscopic experiments in cold atoms. The findings provide critical insights into interpreting light-matter interactions beyond weak-drive approximations, advancing our understanding of fundamental quantum dynamics.
Fermi’s golden rule in a quantum many-body system
Yale researchers validate Fermi’s Golden Rule in a strongly interacting Fermi gas using Quantum Spectral Functions, demonstrating its emergence and breakdown with a radio-frequency field.
Researchers have mapped a detailed dynamical response diagram for a strongly interacting spin-1/2 Fermi gas, demonstrating the emergence and breakdown of Fermi’s golden rule in how transition probabilities unfold. The work shows that, for weak drives, transition probability increases proportionally to the square of time (t2), followed by an intermediate-time regime consistent with Fermi’s…
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