Hannover 2010 – wissenschaftliches Programm

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A: Fachverband Atomphysik

A 9: Ultra-Cold Atoms, Ions and BEC II (with Q)

A 9.5: Vortrag

Mittwoch, 10. März 2010, 11:30–11:45, F 303

Two-way conversations between cold atoms and semiconductors — •Thomas Judd^1,2, Robin Scott², German Sinuco², Tom Montgomery², Andrew Martin³, Peter Krüger², and Mark Fromhold² — ¹University of Tübingen, Germany — ²University of Nottingham, UK — ³University of Melbourne, Australia

There has been significant work in the past few years on hybrid devices which combine cold atoms with solid state structures. The hope is to create devices which combine the key advantages of both systems - the purity of a quantum coherent atom cloud, and the versatility of microchips - to study fundamental physics and further quantum technologies. To date there has been much success in manipulating cold atoms with microchips and semiconductors to create a measurable signal in the atom cloud. However, it has not been possible to perform the reverse procedure of using cold atoms to create a measurable signal in a solid state device. If this two-way coupling can be achieved, a range of possibilities open up such as long-term quantum memory chips. Here we use simulations to show that Fresnel zone plates could assist these efforts by strongly and coherently focusing ultracold atoms onto a semiconductor chip with a two-dimensional electron gas (2DEG). The atoms are shown to deplete the 2DEG, thereby strongly increasing its resistivity to measurable levels. The technique provides a solution to the long standing problem of short-range atom focusing while at the same time opening the door to a new form of non-destructive lithography which can create electronic components on a 50nm scale.