非局域电子-声子耦合。对极化子性质的影响[参考文献]

3区工程技术 Q1 Materials Science Journal of Polymer Science. Part B, Polymer Physics Pub Date : 2004-01-01 DOI:10.1002/PSSC.200303645

V. Stojanović, Pa Peter Bobbert, Maj Thijs Michels

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引用次数: 3

摘要

我们提出了一种扩展的Holstein模型的变分方法，包括局域和非局域电子-声子耦合。该方法基于最小的Bogoliubov束缚到耦合电子-声子系统的自由能，并实现了一维最近邻模型，爱因斯坦声子。非局部耦合的矛盾特性，既促进又阻碍输运，被清楚地观察到。我们的结果的一个显著特征是局部和非局部耦合可以相互补偿，导致极化效应的抑制。

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Nonlocal electron-phonon coupling. Influence on the nature of polarons [refereed]

We present a variational approach to an extended Holstein model, comprising both local and nonlocal electron-phonon coupling. The approach is based on the minimization of a Bogoliubov bound to the free energy of the coupled electron-phonon system, and is implemented for a one-dimensional nearest-neighbor model, with Einstein phonons. The ambivalent character of nonlocal coupling, which both promotes and hinders transport, is clearly observed. A salient feature of our results is that the local and nonlocal couplings can compensate each other, leading to a supression of polaronic effects.

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来源期刊

Journal of Polymer Science. Part B, Polymer Physics 工程技术-高分子科学

CiteScore

5.90

自引率

0.00%

发文量

审稿时长

2.1 months

期刊介绍： Since its launch in 1946 by P. M. Doty, H. Mark, and C.C. Price, the Journal of Polymer Science has provided a continuous forum for the dissemination of thoroughly peer-reviewed, fundamental, international research into the preparation and properties of macromolecules. From January 2020, the Journal of Polymer Science, Part A: Polymer Chemistry and Journal of Polymer Science, Part B: Polymer Physics will be published as one journal, the Journal of Polymer Science. The merged journal will reflect the nature of today''s polymer science research, with physics and chemistry of polymer systems at the heart of the scope. You can continue looking forward to an exciting mix of comprehensive reviews, visionary insights, high-impact communications, and full papers that represent the rapid multidisciplinary developments in polymer science. Our editorial team consists of a mix of well-known academic editors and full-time professional editors who ensure fast, professional peer review of your contribution. After publication, our team will work to ensure that your paper receives the recognition it deserves by your peers and the broader scientific community.