4.7 Article

Critical exponents in metastable decay via quantum activation

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PHYSICAL REVIEW E
卷 75, 期 1, 页码 -

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AMER PHYSICAL SOC
DOI: 10.1103/PhysRevE.75.011101

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We consider decay of metastable states of forced vibrations of a quantum oscillator close to the bifurcation points where the states disappear. Decay occurs via quantum activation over a quasienergy barrier, a mechanism that differs from both tunneling and thermal activation. The decay probability W scales with the distance eta to the bifurcation point as parallel to ln W parallel to proportional to eta(xi). The exponent xi is found for a resonantly driven oscillator and an oscillator modulated at nearly twice its eigenfrequency.

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