Nonadiabatic Effect and Dynamic Compensation in a Spin-Boson System

1.提出了自旋-玻色子双线性耦合系统的动力学补偿理论。来自零点和热力学涨落的贡献完全被来自相干激发玻色子在玻色子能量的红外范围内的动力学涨落的贡献补偿。我们必须同时处理玻色子浴的绝热和非绝热效应。这些是不可分割的一个彼此。2.地面状态已制定和变分研究。该理论描述了在欧姆情况下，在白色熔池ffidt中当临界耦合强度α_c = 1/2时发生隧穿-局域化转变，这与绝热重整化得到的1不同.热力学和动力学已经制定。研究发现自旋-玻色子相互作用被基态关联耗尽.提出了一种新的计算热平均值的方法，即微分运算法。在使用这种方法，我们研究的力学和下一步计算的热力学效应.研究表明，在通过双线性相互作用耦合到玻色浴的简并势极小系统（量子隧穿系统）中，动态补偿是重整化的一个新概念。

1. Dynamics compensation theory has been proposed for a spin-boson system with a bilinear coupling between. Contributions from the zero-point and thermodynamic fluctuations are completely compensated by those from the dynamical fluctueltions of cohererly excited bosons in the infrared range of boson energy. We have to treat the adiabatic and nonadiababatic effects of the bosonic bath simultaneously. Those are inseparable ones from one another.2. The ground stale has been formulated and studied variationally. This theory describes that in the ohmic case the tunneling-localization transition takes place at a critical coupling strength alpha_c = 1/2 in the white bath ffidt, which is different from 1 obtained by the adiabatic renormalization.3. The thermodynamics and dynamics have been formulated. It has been found that the spin-boson interaction is exhausted by the ground state correlation.4. A new method has been proposed to compute the thermal average by differential operation. On using this method we study the mechanics and next calculate the thermodynamic effect.5. It has been shown that the dynamic compensation is a new concept of renormalization in a system with degenerate potentialftminima(quantum tunneling system)which is coupled to a bosonic bath by a bilinear interaction.