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arXiv 2204.09199cond-mat.str-el
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长程耦合对双电子-声子耦合模型中单极化子性质的影响

Role of long-range coupling on the properties of single polarons in models with dual electron-phonon couplings

Monodeep Chakraborty, Sankeerth S. Narayan, Vigneshwaran R., Mona Berciu

摘要:

我们使用变分精确对角化研究四种不同的对偶模型的单极子属性,结合了短程非对角(Peierls)加上较长范围的对角(Holstein或呼吸模式)耦合。这使我们能够研究各种极化子特性对对角耦合范围和所选特定对角耦合的敏感性。我们发现强的灵敏度的范围内为所有的ESTA模型的绝热极限接近,但相当大的灵敏度观察到的一些数量,即使是大的声子频率。此外,在参数空间中处处观察到结果对对角耦合的具体形式的强烈依赖性。两者合计,这些结果表明,必须仔细考虑的具体耦合和它的适当范围时,与实验进行定量比较。

英文摘要:

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.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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