Detection of Coulomb Charging around an Antidot

Details Detection of Coulomb Charging around an Antidot Detection of Coulomb Charging around an Antidot

1999-07-29

arxiv.org/abs/cond-mat/9907467v1

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

3 pages, 3 Postscript figures, submitted to the proceedings of EP2DS-13

Scientific paper

10.1016/S1386-9477(99)00216-7

We have detected oscillations of the charge around a potential hill (antidot) in a two-dimensional electron gas as a function of a perpendicular magnetic field B. The field confines electrons around the antidot in closed orbits, the areas of which are quantised through the Aharonov-Bohm effect. Increasing B reduces each state's area, pushing electrons closer to the centre, until enough charge builds up for an electron to tunnel out. This is a new form of the Coulomb blockade seen in electrostatically confined dots. We have also studied h/2e oscillations and found evidence for coupling of opposite spin states of the lowest Landau level.

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