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TT: Fachverband Tiefe Temperaturen
TT 66: 2D Materials: Electronic structure, excitations, etc. – Poster (joint session O/TT)
TT 66.5: Poster
Mittwoch, 11. März 2026, 18:00–20:00, P2
Theory of few- and many-body excitations in carbon nanotubes — •Maurice Beringuier1,2 and Richard Schmidt1,2 — 1Institut für Theoretische Physik, Philosophenweg 16, 69120 Heidelberg — 2Universität Heidelberg, Grabengasse 1, 69117 Heidelberg
Even decades after their discovery, some properties of Carbon Nanotubes (CNTs) are still not fully understood. One of the phenomena still lacking a satisfying explanation is the behaviour of the absorption spectrum of semiconducting CNTs under doping. A resonance in these spectra appears only in the presence of additional charge carriers.
This has in the past been described with phenomenological models or few body physics (using trions and excitons), but experimental data (e.g. time resolved measurements of the spectra) hint at potential signatures of many-body physics. Inspired by their abundance in 2D or 3D semiconductors and cold quantum gases, we investigate whether quasiparticles like Fermi polarons could be responsible for the observations in CNTs, which due to their interesting geometry exhibit aspects of both 1D and 2D materials.
We tackle these questions by modeling charge carriers and excitons on CNTs interacting using a combination of exact diagonalization and variational techniques to gain insight into the interplay of few- and many-body physics in these systems.
Keywords: Carbon Nanotubes; CNTs; Exciton; Trion; Polaron