Hannover 2020 – scientific programme

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A: Fachverband Atomphysik

A 23: Interaction with VUV and X-ray light I

A 23.1: Invited Talk

Thursday, March 12, 2020, 11:00–11:30, f107

Manipulating dissipative channels of highly excited systems — •Stefan Yoshi Buhmann — University of Freiburg, Germany

Highly excited atomic of molecular systems can loose their energy by a range of dissipative channels: via spontaneous or Auger decay for isolated systems or by means of interatomic Coulombic decay in the presence of neighbours.

We give an overview over how these competing channels can be manipulated by environments such as media or surfaces [1] in a generalised Purcell effect [2]. The basis for our investigation is coupling of charged matter with the environment-assisted quantised electromagnetic field within the framework of macroscopic quantum electrodynamics (QED) [3]. Inter alia, we show that Auger decay is much less susceptible to environment effects than radiative or interatomic Coulombic decay; that local-field effects need to be taken into account when considering systems embedded in media; and that some of the investigated channels can be enhanced by collective, superradiance-type effects [4].

[1] J.L. Hemmerich, R.Bennett, S.Y. Buhmann, Nat. Commun. 9, 2934 (2018).

[2] E. M. Purcell, Phys. Rev. 69, 674 (1946).

[3] S. Y. Buhmann, Dispersion forces I (Springer, Heidelberg, 2013).

[4] S. Fuchs, S. Y. Buhmann, Europhys. Lett. 124, 34003 (2018).