论文标题
远程耦合在单个极性物质中的性能中的作用
Role of long-range coupling on the properties of single polarons in models with dual electron-phonon couplings
论文作者
论文摘要
我们使用变分精确的对角线化来研究四个不同的双重模型的单个偏极特性，结合了一个短距离偏外（PEIERLS）以及较长的对角线（Holstein或Holstein或呼吸模式）耦合。这使我们能够研究各种极性特性对对角线偶联范围的灵敏度以及所选择的特定对角线偶联的敏感性。随着绝热极限的接近，我们发现对所有双重模型的范围的敏感性很强，但是对于大声频率的大量频率也可以观察到相当大的灵敏度。同样，在参数空间中到处都可以观察到结果对对角线耦合的特定形式的强烈依赖性。综上所述，这些结果表明，当寻求定量比较时，必须仔细考虑特定耦合及其适当范围。
We use the Variational Exact Diagonalization to investigate the single polaron properties for four different dual models, combining a short-range off-diagonal (Peierls) plus a longer-range diagonal (Holstein or breathing-mode) coupling. This allows us to investigate the sensitivity of various polaron properties both to the range of the diagonal coupling and to the specific diagonal coupling chosen. We find strong sensitivity to the range for all duals models as the adiabatic limit is approached, however considerable sensitivity is observed for some quantities even for large phonon frequencies. Also, the strong dependence of the results on the specific form of the diagonal coupling is observed everywhere in the parameter space. Taken together, these results suggest that careful consideration must be given to the specific coupling and its proper range when quantitative comparisons with experiments are sought.
