Persistent supercurrent atom chip

Rubidium-87 atoms are trapped in an Ioffe-Pritchard potential generated with a persistent supercurrent that flows in a loop circuit patterned on a sapphire surface. The superconducting circuit is a closed loop made of a 100 microm wide molecular-beam epitaxy-grown MgB2 stripe carrying a supercurrent...

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Bibliographic Details
Published inPhysical review letters Vol. 98; no. 26; p. 260407
Main Authors Mukai, T, Hufnagel, C, Kasper, A, Meno, T, Tsukada, A, Semba, K, Shimizu, F
Format Journal Article
LanguageEnglish
Published United States 29.06.2007
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Summary:Rubidium-87 atoms are trapped in an Ioffe-Pritchard potential generated with a persistent supercurrent that flows in a loop circuit patterned on a sapphire surface. The superconducting circuit is a closed loop made of a 100 microm wide molecular-beam epitaxy-grown MgB2 stripe carrying a supercurrent of 2.5 A. To control the supercurrent in the stripe, an on-chip thermal switch operated by a focused argon-ion laser is developed. The switch operates as an on/off switch of the supercurrent or as a device to set the current to a specific value with the aid of an external magnetic field. The current can be set even without an external source if the change is in the decreasing direction.
ISSN:0031-9007
DOI:10.1103/PhysRevLett.98.260407