Quantum reflection of ultracold atoms from semiconductor surfaces

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Using solid surfacesto control BECs• Atom chips (cold chips)– Current-carrying wires microfabricatedon a surface– More later...• Natural surfaces– Quantum reflection can shieldnK BECs from disruption by aa room-temperature surfaceonly a few microns awayR. Folman et al.,Phys. Rev. Lett. 84, 4749 (2000)Fortagh & ZimmermannRev. Mod. Phys. 79, 235 (2007)
Motivation for studyingquantum reflection• Manipulate BECs using only intrinsic surface potential• Make atom-optical elements, such as mirrors, lensesand cavities, without the need for external fields• Use the reflection process to probe both theatom-surface and atom-atom interactions
Page 1 and 2: Quantum reflection ofultracold atom
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Page 9 and 10: Effect of the Casimir-Polder potent
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Page 17 and 18: Solved time-dependent Gross-Pitaevs
Page 19 and 20: Reflection from a Si wall (Casimir-
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Page 25 and 26: Use this shape for studying BEC-sur
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Quantum reflection of ultracold atoms from semiconductor surfaces

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