Doublon dynamics and polar molecule production in an optical lattice.
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Here we use such a system to prepare a density distribution where lattice sites are either empty or occupied by a doublon composed of an interacting Bose-Fermi pair.Additionally, we can probe the distribution of the atomic gases in the lattice by measuring the inelastic loss of doublons.These techniques realize tools that are generically applicable to studying the complex dynamics of atomic mixtures in optical lattices.
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Affiliation: JILA, National Institute of Standards and Technology and University of Colorado, Boulder, Colorado 80309, USA.
ABSTRACT
Polar molecules in an optical lattice provide a versatile platform to study quantum many-body dynamics. Here we use such a system to prepare a density distribution where lattice sites are either empty or occupied by a doublon composed of an interacting Bose-Fermi pair. By letting this out-of-equilibrium system evolve from a well-defined, but disordered, initial condition, we observe clear effects on pairing that arise from inter-species interactions, a higher partial-wave Feshbach resonance and excited Bloch-band population. These observations facilitate a detailed understanding of molecule formation in the lattice. Moreover, the interplay of tunnelling and interaction of fermions and bosons provides a controllable platform to study Bose-Fermi Hubbard dynamics. Additionally, we can probe the distribution of the atomic gases in the lattice by measuring the inelastic loss of doublons. These techniques realize tools that are generically applicable to studying the complex dynamics of atomic mixtures in optical lattices. No MeSH data available. Related in: MedlinePlus |
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Mentions: Figure 3 illustrates doublon dynamics due to the interplay between tunnelling and interactions, which we control by varying the lattice depth, interspecies scattering length aK-Rb and band population. The fraction of doublons that remain after is essentially equal to the measured molecule conversion efficiency described above. We note that for aK-Rb>−850a0, the B sweep crosses the d-wave Feshbach resonance with a that varies from 0.5 to 1.9 mT ms−1. Using our measured width of the d-wave resonance, the data presented in Fig. 3 have been multiplied by a factor that increases the doublon fraction to account for the finite when crossing the d-wave resonance. Figure 3a shows the effect of the lattice depth for at three different values of Bhold, corresponding to different values of aK-Rb. This timescale is relevant for both molecule production and K tunnelling dynamics. We observe that the remaining doublon fraction is highly sensitive to the lattice depth for weak interspecies interactions, for example, aK-Rb=−220a0, with a lower doublon fraction for shallower lattices that exhibit higher tunnelling rates. For stronger interactions, the dependence on lattice depth becomes less significant and almost disappears in the strongly interacting regime, for example, aK-Rb=−1,900a0. Similar behaviour is observed if we fix the lattice depth but vary the interspecies interactions, as shown in Fig. 3b. |
View Article: PubMed Central - PubMed
Affiliation: JILA, National Institute of Standards and Technology and University of Colorado, Boulder, Colorado 80309, USA.
No MeSH data available.