$Feshbach resonances in $p$-wave three-body recombination within Fermi-Fermi mixtures of open-shell $^6$Li and closed-shell $^{173}$Yb atoms$

Feshbach resonances in $p$-wave three-body recombination within Fermi-Fermi mixtures of open-shell $^6$Li and closed-shell $^{173}$Yb atoms

We report on observations and modeling of interspecies magnetic Feshbach resonances in dilute ultracold mixtures of open-shell alkali-metal $^6$Li and closed-shell $^{173}$Yb atoms with temperatures just above quantum degeneracy for both fermionic species. Resonances are located by detecting mag...

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Veröffentlicht in:	arXiv.org 2019-12
Hauptverfasser:	Green, Alaina, Li, Hui, Jun Hui See Toh, Tang, Xinxin, McCormick, Katherine, Li, Ming, Tiesinga, Eite, Kotochigova, Svetlana, Gupta, Subhadeep
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Sprache:	eng
Schlagworte:	Alkali metals Computer simulation Coupling (molecular) Electron spin Electronic structure Fluids Lithium Magnetic resonance Nuclear spin Superfluidity
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description	We report on observations and modeling of interspecies magnetic Feshbach resonances in dilute ultracold mixtures of open-shell alkali-metal $^6$Li and closed-shell $^{173}$Yb atoms with temperatures just above quantum degeneracy for both fermionic species. Resonances are located by detecting magnetic-field-dependent atom loss due to three-body recombination. We resolve closely-located resonances that originate from a weak separation-dependent hyperfine coupling between the electronic spin of $^6$Li and the nuclear spin of $^{173}$Yb, and confirm their magnetic field spacing by ab initio electronic-structure calculations. Through quantitative comparisons of theoretical atom-loss profiles and experimental data at various temperatures between 1 $\mu$K and 20 $\mu$K, we show that three-body recombination in fermionic mixtures has a $p$-wave Wigner threshold behavior leading to characteristic asymmetric loss profiles. Such resonances can be applied towards the formation of ultracold doublet ground-state molecules and quantum simulation of superfluid $p$-wave pairing.
doi_str_mv	10.48550/arxiv.1912.04874
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subjects	Alkali metals Computer simulation Coupling (molecular) Electron spin Electronic structure Fluids Lithium Magnetic resonance Nuclear spin Superfluidity
title	Feshbach resonances in $p$-wave three-body recombination within Fermi-Fermi mixtures of open-shell $^6$Li and closed-shell $^{173}$Yb atoms
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Feshbach resonances in \(p\)-wave three-body recombination within Fermi-Fermi mixtures of open-shell \(^6\)Li and closed-shell \(^{173}\)Yb atoms