14 research outputs found

    Dipolar quantum solids emerging in a Hubbard quantum simulator

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    In quantum mechanical many-body systems, long-range and anisotropic interactions promote rich spatial structure and can lead to quantum frustration, giving rise to a wealth of complex, strongly correlated quantum phases. Long-range interactions play an important role in nature; however, quantum simulations of lattice systems have largely not been able to realize such interactions. A wide range of efforts are underway to explore long-range interacting lattice systems using polar molecules, Rydberg atoms, optical cavities, and magnetic atoms. Here, we realize novel quantum phases in a strongly correlated lattice system with long-range dipolar interactions using ultracold magnetic erbium atoms. As we tune the dipolar interaction to be the dominant energy scale in our system, we observe quantum phase transitions from a superfluid into dipolar quantum solids, which we directly detect using quantum gas microscopy with accordion lattices. Controlling the interaction anisotropy by orienting the dipoles enables us to realize a variety of stripe ordered states. Furthermore, by transitioning non-adiabatically through the strongly correlated regime, we observe the emergence of a range of metastable stripe-ordered states. This work demonstrates that novel strongly correlated quantum phases can be realized using long-range dipolar interaction in optical lattices, opening the door to quantum simulations of a wide range of lattice models with long-range and anisotropic interactions

    The World Health Organization Engaging with Civil Society Networks to Promote Primary Health Care : A Case Study

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    Engagement between the World Health Organization (WHO) and civil society organizations (CSOs), gains importance as CSOs increase their contribution to public health; particularly to primary health care. To better engage civil society in revitalizing primary health care the WHO collaborated with the Community Health Global Network (CHGN), a civil society network. This article uses the WHO-CHGN relationship to demonstrate how this collaboration enabled the WHO to inform and to learn from those with current primary health care experience. Learning from a systematic documentation of the collaboration provides insight into the WHO and CHGN perspectives concerning the relationship; informs future WHO-CSO collaborations and contributes to the understanding of the ways in which the WHO accesses and hears those actively engaged in health care programs.Peer reviewe
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