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Bound states of 3He at the edge of a 4He drop on a cesium surface
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We show that small amounts of 3He atoms, added to a 4He drop deposited on a flat cesium surface at zero temperature, populate bound states localized at the contact line. These edge states show up for drops large enough to develop well defined surface and bulk regions together with a contact line, and they are structurally different from the well-known Andreev states that appear at the free surface and at the liquid-solid interface of films. We illustrate the one-body density of 3He in a drop with 1000 4He atoms, and show that for a sufficiently large number of impurities the density profiles spread beyond the edge, coating both the curved drop surface and its flat base and eventually isolating it from the substrate.
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MAYOL SÁNCHEZ, Ricardo, et al. Bound states of 3He at the edge of a 4He drop on a cesium surface. Physical Review Letters. 2003. Vol. 90, num. 18, pags. 185301-1-185301-4. ISSN 0031-9007. [consulted: 9 of October of 2026]. Available at: https://hdl.handle.net/2445/12823