SAMOP 2023 – wissenschaftliches Programm

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Q: Fachverband Quantenoptik und Photonik

Q 22: Poster II

Q 22.37: Poster

Dienstag, 7. März 2023, 16:30–19:00, Empore Lichthof

Emergence of collective excitations in few Fermion systems — •Johannes Reiter, Philipp Lunt, Paul Hill, Philipp Preiss, and Selim Jochim — Physikalisches Institut, Universität Heidelberg, Deutschland

The emergence of collective behaviour in strongly-interacting mesoscopic systems has been a long-standing question in nuclear and cold atom physics [1,2]. Our previously established technique to deterministically prepare few Fermion systems [3] in combination with the tunability of interactions in ultracold gases allows us to address this question. However, to observe clear signatures of elementary excitations in a strongly interacting few Fermion system precise control of the optical potential is required.

We present a refined version of phase shift interferometry [5] to detect wavefront aberrations on the atoms and compensate for them using a spatial light modulator.

Building on this, we study the quadrupole mode across the BEC-BCS crossover by means of spectroscopic probes. Tuning of the inter-particle interactions via a broad Feshbach resonance allows us to observe the transition from single-particle to collective excitations and varying the atom number enables us to observe the emergence of collective behaviour atom by atom.

[1] B. Mottelson Science 193 (4250), 287-294 (1976) [2] S. Giorgini et al. Rev.Mod.Phys. 80, 125 (2008) [3] F. Serwane et al. Science 332 (6027), 336-338 (2011) [4] L. Bayha et al. Nature 587.7835, 583-587 (2020) [5] P. Zupancic et al. Optics express 24.13, 13881-13893 (2016)