Hannover 2020 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 34: Quantum gases (Fermions) II

Q 34.1: Invited Talk

Wednesday, March 11, 2020, 14:00–14:30, e214

Zooming in on Fermi Gases in Two Dimensions — •Philipp Preiss, Luca Bayha, Jan Hendrik Becher, Marvin Holten, Ralf Klemt, Philipp Lunt, Keerthan Subramanian, and Selim Jochim — Physics Institute, Heidelberg University

Interacting Fermi systems in two dimensions display interesting phenomena including strongly correlated superfluids, pseudogap physics, and collective excitations. Certain limits, such as the weakly interacting regime and the few-body case, can be modeled exactly, but for a large parameter space in particle number and interaction strength, predicting the relevant physical properties theoretically is extremely challenging.

I will report on experiments that realize tunable fermion systems with ultracold lithium and span large swaths of the interesting regime. We have assembled a complete experimental toolbox to study such systems with single-particle resolution in position and momentum space.

In the well-controlled few-body scenario, we deterministically prepare few fermions in the ground state of a two-dimensional trap and observe the formation of shell structure with stable “magic” numbers of 2,6,12 particles. Through many-body spectroscopy, we find well-defined resonances that consists of pairwise excitations and can be identified as the precursor of the Higgs amplitude mode.

Scaling the system to sizes of several hundred particles, we are able to probe strongly correlated continuum systems with the microscopic tools of particle-resolved correlation functions.