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arXiv 2305.03473cond-mat.mes-hallquant-ph
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多体环境中旋转分子的全耦合angulon理论

Theory of all-coupling angulon for molecules rotating in many-body environment

Yi-Yan Liu, Yu Cui, Xiao-Zhe Zhang, Ran-Bo Yang, Zhi-Qing Li, Zi-Wu Wang

AI总结:

针对多体环境中旋转分子与环境的耦合强度分析难题,提出基于幺正变换的全耦合angulon理论,复现实验结果并可估算耦合强度与溶剂化壳层半径,为分子转动光谱及声子角动量转移研究提供新方法。

摘要:

angulon(角子)源于在量子多体场中旋转的转子(分子或杂质),它的形成为准粒子家族增添了新成员,并已在多个研究领域引发广泛关注。然而,转子与其所处环境之间的耦合强度分析,无论在理论还是实验层面仍是一项具有挑战性的任务。本文中,我们通过引入幺正变换构建了angulon的全耦合理论,该理论复现了氦纳米液滴中不同分子的转动常数重整化结果,与过去数十年间收集的实验数据取得了极佳的一致性。此外,该方法还能定性估算分子-氦耦合强度以及随分子转子共转的溶剂化壳层有效半径。该模型不仅为分析声子环境中分子的转动光谱提供了重要启示,也为研究angulon框架下声子角动量的转移提供了新方法。

英文摘要:

The formation of angulon, stemming from the rotor (molecule or impurity) rotating in the quantum many-body field, adds a new member in the quasiparticle's family and has aroused intensively interests in multiple research fields. However, the analysis of the coupling strength between the rotor and its hosting environment remains a challenging task both in theory and experiment. Here, we develop the all-coupling theory of the angulon by introducing an unitary transformation, where the renormalization of the rotational constants for different molecules in the helium nanodroplets are reproduced, getting excellent agreement with the collected experimental data during the past decades. Moreover, the strength of molecule-helium coupling and the effective radius of the solvation shell corotating along with the molecular rotor could be estimated qualitatively. This model not only provides the significant enlightenment for analyzing the rotational spectroscopy of molecules in the phononic environment, but also provides a new method to study the transfer of the phonon angular momentum in angulon frame.

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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