强双色场驱动下自旋系统的多光子跃迁
Multiphoton Transitions in a Spin System Driven by Strong Bichromatic Field
摘要：
利用EPR瞬态章动谱测量了在横向微波场和纵向射频场双色驱动下的二能级自旋系统中多光子跃迁的有效场（Rabi频率）。当有效哈密顿量的推导不能在w_{1} / w_{rf}（w_{1}是微波拉比频率，w_{rf}是RF频率）中简化为一阶微扰理论时，在相对强的MW场的情况下检查有效场振幅的行为。实验结果是一致的解释，考虑到在w_{1} / w_{rf}的Krylov-Bogolyubov-Mitropolsky平均评价的第二和第三阶的贡献。在非均匀展宽EPR谱线的情况下，三阶修正修正章动频率，而二阶修正由于布洛赫-西格特位移引起章动振幅的变化。
英文摘要：
EPR transient nutation spectroscopy is used to measure the effective field (Rabi frequency) for multiphoton transitions in a two-level spin system bichromatically driven by a transverse microwave (MW) field and a longitudinal radio-frequency (RF) field. The behavior of the effective field amplitude is examined in the case of a relatively strong MW field, when the derivation of the effective Hamiltonian cannot be reduced to first-order perturbation theory in w_{1} / w_{rf} (w_{1} is the microwave Rabi frequency, w_{rf} is the RF frequency). Experimental results are consistently interpreted by taking into account the contributions of second and third order in w_{1} / w_{rf} evaluated by Krylov-Bogolyubov-Mitropolsky averaging. In the case of inhomogeneously broadened EPR line, the third-order correction modifies the nutation frequency, while the second-order correction gives rise to a change in the nutation amplitude due to a Bloch-Siegert shift.
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