Heidelberg 2015 – wissenschaftliches Programm

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A: Fachverband Atomphysik

A 7: Poster: Atomic systems in external fields

A 7.4: Poster

Montag, 23. März 2015, 17:00–19:00, C/Foyer

Exciton Interactions in Two Dimensions — •Valentin Walther, Robert Johne, and Thomas Pohl — Max-Planck-Institut für Physik komplexer Systeme, Dresden

Recent experiments have shown that excitons with binding energies of up to 1 eV can be produced in a special class of two-dimensional semiconductors known as TMDCs (transition metal dichalogenides) [1].

We study the excited level structure of such excitons accounting for two-dimensional screening effects. Based on these results we explore the possibility to manipulate the properties by external fields. We determine the resulting interactions at asymptotic distances and discuss the importance of non-adiabatic effects.

[1] A. Chernikov et al., Phys. Rev. Lett. 113, 076802 (2014)