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Q: Fachverband Quantenoptik und Photonik

Q 54: Posters: Quantum Optics and Photonics IV

Q 54.38: Poster

Donnerstag, 12. März 2020, 16:30–18:30, Empore Lichthof

Dirty Fermions — •André Becker and Axel Pelster — Physics Department and Research Center OPTIMAS, Technische Universität Kaiserslautern, Germany

We consider fermionic atoms in a harmonic trapping potential and analyze the impact of a frozen random environment in the BCS regime. To this end we investigate the effect of either laser speckles or impurity disorder upon the Cooper pairing of fermions without population imbalance. In close analogy to the corresponding case study [1] in the BEC regime, we treat disorder perturbatively as well as non-perturbatively, and focus, in particular, upon the question how the Thomas-Fermi radii of the cloud depend on the disorder strength. Finally, we discuss our findings in view of Anderson’s theorem which states that superconductivity is robust with respect to non-magnetic disorder in the host material [2].

[1] B. Nagler, M. Radonjic, S. Barbosa, J. Koch, A. Pelster, and A. Widera, arXiv:1911.02626

[2] P.W. Anderson, J. Phys. Chem. Solids. 11, 26 (1959)