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The influence of interchain coupling on intramolecular oscillation mobility in coupled macromolecular chains: the case of coplanar parallel chains

机译：链间耦合对分子内振荡的影响   耦合大分子链中的迁移率：共面平行的情况   链

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摘要

We enlarge our results from the study of the hopping mechanism of theoscillation excitation transport in 1D model of one biology-like macromolecularchain to the case of a system composed from two 1D parallel macromolecularchains with consideration of the properties of intramolecular oscillationexcitations. We suppose, that due to the exciton interaction with thermaloscillation (generated by mechanical phonon subsystem) of structural elements(consisting of the peptide group) of the chains, the exciton becomes by selftrapped and forms the polaron state. We suggest a model which generalizes themodified Holstein polaron model to the case of two macromolecular chains andfind that because of the interchain coupling, the exciton energy band issplitted into two subbands. The hopping process of exciton migration along themacromolecular chains is studied in dependence of system parameters andtemperature. We pay an special attention to the temperature range (near T=300K) in which living cells operate. It is found that for the certain values ofthe system parameters there exists the abrupt change of the exciton migrationnature from practically free (light) exciton motion to an immobile (heavy,dressed by phonon cloud) quasiparticle We discuss an application of theobtained results to the exciton transport both within deoxyribonucleic acidmolecule and in the 2D polymer films organized from such macromolecular chains.
机译：考虑到分子内振荡激发的性质，我们将从对一种生物学样大分子链的一维模型中的振荡激发传输的跳跃机制的研究扩大到由两个一维平行大分子链组成的系统的情况。我们假设，由于激子与链的结构元素（由肽基组成）的热振荡相互作用（由机械声子子系统产生），激子被自陷并形成极化子态。我们提出了一个模型，该模型将改进的Holstein极化子模型推广到两条大分子链的情况，并发现由于链间的耦合，激子能带被分为两个子带。根据系统参数和温度，研究了激子沿大分子链的跳跃过程。我们特别注意活细胞工作的温度范围（T = 300K附近）。发现对于系统参数的某些值，激子迁移性质从几乎自由的（轻）激子运动到不动的（重的，由声子云修整）准粒子存在突变，我们讨论了所得结果在激子中的应用在脱氧核糖核酸分子内和由此类大分子链组成的2D聚合物膜中都可以转运。

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