两平行高分子链体系中振动子的性质：链间耦合的影响
On the vibron nature in the system of two parallel macromolecular chains: the influence of interchain coupling
摘要：
研究了两条平行高分子链组成的体系在有限温度下分子内振动激发（振子）的性质。假设振动子只与无色散光学声子相互作用，整个系统处于热平衡。特别注意检查温度和链间偶联强度对\emph{small polaron}交叉的影响。为此，我们采用了部分修整的方法，使研究的程度的声子修整的振动子激发在一个广泛的区域系统参数空间。我们发现，在非绝热制度的程度作为一个函数的耦合常数的敷料，不断增加，反映了轻微的装饰，几乎自由振子的平滑过渡，到一个沉重的打扮：小极化子。随着“绝热性”的上升，这种转变变得越来越陡峭，最后，在绝热极限，观察到一个不连续的“跳跃”的程度敷料。链间耦合通过系统有效绝热参数的增加而表现出来。
英文摘要：
We studied the properties of the intramolecular vibrational excitation (vibron) at finite temperature in a system which consists of two parallel macromolecular chains. It was assumed that vibron interacts exclusively with dispersionless optical phonons and the whole system is considered to be in thermal equilibrium. Particular attention has been paid to the examination of the impact of the temperature and strength of the interchain coupling on the \emph{small polaron} crossover. For that purpose we employed partial dressing method which enables the study of the degree of the phonon dressing of the vibron excitations in a wide area of system parameter space. We found that in the non--adiabatic regime the degree of dressing as a function of coupling constant continuously increases reflecting the smooth transition of the slightly dressed, practically free vibron, to a heavily dressed one: small polaron. As "adiabaticity" rises this transition becomes increasingly steeper, and finally, in the adiabatic limit, a discontinuous "jump" of the degree of dressing is observed. The interchain coupling manifests itself through the increase of the effective adiabatic parameter of the system.
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