Detection of Coulomb Charging around an Antidot in the Quantum Hall Regime

Details Detection of Coulomb Charging around an Antidot in the Quantum Hall Regime Detection of Coulomb Charging around an Antidot in the Quantum Hall Regime

1999-07-29

arxiv.org/abs/cond-mat/9907466v1

Phys. Rev. Lett. 83, 160 (1999)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

4 pages, 4 Postscript figures

Scientific paper

10.1103/PhysRevLett.83.160

We have detected oscillations of the charge around a potential hill (antidot) in a two-dimensional electron gas as a function of a large 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. Addition and excitation spectra in DC bias confirm the Coulomb blockade of tunnelling.

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