We study the impurity problem in a gas of $^{173}\mathrm{Yb}$ atoms near the recently discovered orbital Feshbach resonance. In an orbital Feshbach resonance, atoms in the electronic ground state $^{1}S_{0}$ interact with those in the long-lived excited $^{3}P_{0}$ state with magnetically tunable interactions. We consider an impurity atom with a given hyperfine spin in the $^{3}P_{0}$ state interacting with a single-component Fermi sea of atoms in the ground $^{1}S_{0}$ manifold. Close to the orbital Feshbach resonance, the impurity can induce collective particle-hole excitations out of the Fermi sea, which can be regarded as the polaron state. As the magnetic field decreases, a molecular state becomes the ground state of the system. We show that a polaron to molecule transition exists in $^{173}\mathrm{Yb}$ atoms close to the orbital Feshbach resonance. Furthermore, due to the spin-exchange nature of the orbital Feshbach resonance, the formation of both the polaron and the molecule involve spin-flipping processes with interesting density distributions among the relevant hyperfine spin states. We show that the polaron to molecule transition can be detected using Raman spectroscopy.We study the impurity problem in a gas of $^{173}\mathrm{Yb}$ atoms near the recently discovered orbital Feshbach resonance. In an orbital Feshbach resonance, atoms in the electronic ground state $^{1}S_{0}$ interact with those in the long-lived excited $^{3}P_{0}$ state with magnetically tunable interactions. We consider an impurity atom with a given hyperfine spin in the $^{3}P_{0}$ state interacting with a single-component Fermi sea of atoms in the ground $^{1}S_{0}$ manifold. Close to the orbital Feshbach resonance, the impurity can induce collective particle-hole excitations out of the Fermi sea, which can be regarded as the polaron state. As the magnetic field decreases, a molecular state becomes the ground state of the system. We show that a polaron to molecule transition exists in $^{173}\mathrm{Yb}$ atoms close to the orbital Feshbach resonance. Furthermore, due to the spin-exchange nature of the orbital Feshbach resonance, the formation of both the polaron and the molecule involve spin-flipping processes with interesting density distributions among the relevant hyperfine spin states. We show that the polaron to molecule transition can be detected using Raman spectroscopy.

arXiv:1608.02744Physical Review ANov 28, 201622 citations

Energy structure of weakly bound molecules near Feshbach resonances

Cheng Chin, Paul S. Julienne, Eite Tiesinga

Bulletin of the American Physical SocietyMay 28, 20080 citations

Tuning Feshbach resonances in cold atomic gases with interchannel coupling

Tian-Shu Deng, Wei Zhang, Wei Yi

We show that the essential properties of a Feshbach resonance in cold atomic gases can be tuned by dressing the atomic states in different scattering channels through inter-channel couplings. Such a scheme can be readily implemented in the orbital Feshbach resonance of alkaline-earth-metal-like atoms by coupling hyperfine states in the clock-state manifolds. Using $^{173}\mathrm{Yb}$ atoms as an example, we find that both the resonance position and the two-body bound-state energy depend sensitively on the inter-channel coupling strength, which offers control parameters in tuning the inter-atomic interactions. We also demonstrate the dramatic impact of the dressed Feshbach resonance on many-body processes such as the polaron to molecule transition and the BCS-BEC crossover.We show that the essential properties of a Feshbach resonance in cold atomic gases can be tuned by dressing the atomic states in different scattering channels through inter-channel couplings. Such a scheme can be readily implemented in the orbital Feshbach resonance of alkaline-earth-metal-like atoms by coupling hyperfine states in the clock-state manifolds. Using $^{173}\mathrm{Yb}$ atoms as an example, we find that both the resonance position and the two-body bound-state energy depend sensitively on the inter-channel coupling strength, which offers control parameters in tuning the inter-atomic interactions. We also demonstrate the dramatic impact of the dressed Feshbach resonance on many-body processes such as the polaron to molecule transition and the BCS-BEC crossover.

arXiv:1705.07367Physical Review ANov 3, 201710 citations

Optical Feshbach Resonances: Field-Dressed Theory and Experimental Comparisons

Sebastian Blatt, J. Ye, Paul S. Julienne

Jan 30, 20150 citations

Polarons and dressed molecules near narrow Feshbach resonances

Pietro Massignan

The properties of impurities immersed in a large Fermi sea are naturally described in terms of dressed quasiparticles: attractive and repulsive polarons, and dressed molecules. Motivated by recent experiments on narrow Feshbach resonances, we analyze here how the quasiparticle properties are affected by a non-zero resonance range. We find two interesting analytic results. For large range, the ground-state energy close to resonance is shown to become perturbative in the inverse range. In the limit of broad resonance instead, we provide a new Tan's relation linking the impurity ground-state energy E ↓ to the number of atoms in its dressing cloud Δ N . As a corollary, at unitarity one finds Δ N =− E ↓ / F , with F the Fermi energy of the bath.The properties of impurities immersed in a large Fermi sea are naturally described in terms of dressed quasiparticles: attractive and repulsive polarons, and dressed molecules. Motivated by recent experiments on narrow Feshbach resonances, we analyze here how the quasiparticle properties are affected by a non-zero resonance range. We find two interesting analytic results. For large range, the ground-state energy close to resonance is shown to become perturbative in the inverse range. In the limit of broad resonance instead, we provide a new Tan's relation linking the impurity ground-state energy E ↓ to the number of atoms in its dressing cloud Δ N . As a corollary, at unitarity one finds Δ N =− E ↓ / F , with F the Fermi energy of the bath.

arXiv:1112.1029Europhysics Letters (EPL)Apr 1, 201241 citations

Classification of Feshbach resonances in electron-molecule scattering

David James Spence

Jan 1, 19761 citation

We study the impurity problem in a gas of

^{173}\mathrm{Yb}

atoms near the recently discovered orbital Feshbach resonance. In an orbital Feshbach resonance, atoms in the electronic ground state

^{1}S_{0}

interact with those in the long-lived excited

^{3}P_{0}

state with magnetically tunable interactions. We consider an impurity atom with a given hyperfine spin in the

^{3}P_{0}

state interacting with a single-component Fermi sea of atoms in the ground

^{1}S_{0}

manifold. Close to the orbital Feshbach resonance, the impurity can induce collective particle-hole excitations out of the Fermi sea, which can be regarded as the polaron state. As the magnetic field decreases, a molecular state becomes the ground state of the system. We show that a polaron to molecule transition exists in

^{173}\mathrm{Yb}

atoms close to the orbital Feshbach resonance. Furthermore, due to the spin-exchange nature of the orbital Feshbach resonance, the formation of both the polaron and the molecule involve spin-flipping processes with interesting density distributions among the relevant hyperfine spin states. We show that the polaron to molecule transition can be detected using Raman spectroscopy.

^{173}\mathrm{Yb}

atoms as an example, we find that both the resonance position and the two-body bound-state energy depend sensitively on the inter-channel coupling strength, which offers control parameters in tuning the inter-atomic interactions. We also demonstrate the dramatic impact of the dressed Feshbach resonance on many-body processes such as the polaron to molecule transition and the BCS-BEC crossover.