Related papers: Toroidal optical transitions in hydrogen-like atoms

Toroidal optical transitions in hydrogen-like atoms

URL: http://arxiv.org/abs/2205.01412v1
Date: Tue, 3 May 2022 10:55:25 GMT
Title: Toroidal optical transitions in hydrogen-like atoms
Authors: Ilya Kuprov, David Wilkowski, Nikolay Zheludev
Abstract summary: We show that interactions between light and matter also involve toroidal multipoles. We show that toroidal transitions are odd under parity and time-reversal symmetries.
Score: 0.0
License: http://creativecommons.org/licenses/by-nc-nd/4.0/
Abstract: It is commonly believed that electromagnetic spectra of atoms and molecules can be fully described by interactions of electric and magnetic multipoles. However, it has recently become clear that interactions between light and matter also involve toroidal multipoles - toroidal absorption lines have been observed in electromagnetic metamaterials. Here we show that a new type of spectroscopy of the hitherto largely neglected toroidal dipolar interaction becomes feasible if, apart from the classical r{\times}r{\times}p toroidal dipole density term responsible for the toroidal transitions in metamaterials, the spin-dependent r{\times}{\sigma} term (that only occurs in relativistic quantum mechanics) is taken into account. We show that toroidal transitions are odd under parity and time-reversal symmetries; they can therefore be observed and distinguished from electric multipole and magnetic dipole transitions.

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