Quantum
Perturbation Theory
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.com · H = H₀ + λV · ⟨n|V|n⟩ · level shifts & splitting
λ (strength)
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1st-order ⟨n|V|n⟩
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Gap
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state
standby
Unperturbed levels Eₙ⁽⁰⁾
Perturbed levels Eₙ
Coupling ⟨m|V|n⟩
Degenerate splitting
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.com · Quantum Perturbation Theory