Seminars
Manipulation of spin and momentum in a Degenerate SU(10) Fermi Gas
July 28th, 2021 MARTIN ROBERT-DE-SAINT-VINCENT Centre National de la Recherche Scientifique

Ultracold alkaline-earth atoms offer the possibility to study the effect of a large spin degree of freedom in strongly correlated Fermionic systems. Here, I will present you the recent developments of our novel apparatus, that produces 10-component degenerate Fermi gases of strontium 87, with short-term prospect to realize the Fermi-Hubbard model and the Heisenberg model of magnetism in optical lattices.

My main subject will be the measurement and control of the spin. In such experiments, the nuclear nature of the spins is both a strength and a complication – for example as usual measurements based on magnetic gradients and forces are ineffective. Nevertheless, narrow lines with hyperfine structure can be used for spin-sensitive manipulations, e.g. effective magnetic fields as in the “Optical Stern-Gerlach” (OSG) scheme [1], and spin-orbit coupling [2]. Here [3], I will present a scheme relying on spin-orbit coupling where up to four spin components are subjected to a different quantized momentum transfer. The scheme is adiabatic, which makes it inherently robust, and relies on atomic dark states, which significantly suppresses spontaneous emission.

This work initiates our toolbox for the characterization of SU(N) quantum antiferromagnets. Presently applied to global spin population measurement, it also provides swap gates between spin states [4], and finally should enable momentum-resolved spin correlation measurements [5].

[1] S. Taie et. al., Phys. Rev. Lett. 105, 190401 (2010).
[2] B. Song et. al., Phys. Rev. A 94, 061604(R) (2016).
[3] P. Bataille et. al., Phys. Rev. A 102, 013317 (2020).
[4] H. Sosa-Martinez et. al., Phys. Rev. Lett. 119, 150401 (2017).
[5] G. M. Bruun et. al., Phys. Rev. A 80, 033622 (2009).

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Seminar, July 28, 2021, 12:00. Online (Zoom)

Hosted by Prof Leticia Tarruell

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