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

Autor: Kataoka, M., Ford, C. J. B., Faini, G., Mailly, D., Simmons, M. Y., Mace, D. R., Liang, C. -T., Ritchie, D. A.

Publikováno v: Phys. Rev. Lett. 83, 160 (1999)

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 quanti

Externí odkaz: http://arxiv.org/abs/cond-mat/9907466

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Detection of Coulomb Charging around an Antidot

Autor: Kataoka, M., Ford, C. J. B., Faini, G., Mailly, D., Simmons, M. Y., Mace, D. R., Liang, C. -T., Ritchie, D. A.

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 ar

Externí odkaz: http://arxiv.org/abs/cond-mat/9907467

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Interaction Effects in a One-Dimensional Constriction

Autor: Thomas, K. J., Nicholls, J. T., Appleyard, N. J., Pepper, M., Simmons, M. Y., Mace, D. R., Tribe, W. R., Ritchie, D. A.

We have investigated the transport properties of one-dimensional (1D) constrictions defined by split-gates in high quality GaAs/AlGaAs heterostructures. In addition to the usual quantized conductance plateaus, the equilibrium conductance shows a stru

Externí odkaz: http://arxiv.org/abs/cond-mat/9806242

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Resonant Tunneling Spectroscopy of Interacting Localised States -- Observation of the Correlated Current Through Two Impurities

Autor: Kuznetsov, V. V., Savchenko, A. K., Mace, D. R., Linfield, E. H., Ritchie, D. A.

We study effects of Coulomb interactions between localised states in a potential barrier by measuring resonant-tunneling spectra with a small bias applied along the barrier. In the ohmic regime the conductance of 0.2um--gate lateral GaAs microstructu

Externí odkaz: http://arxiv.org/abs/cond-mat/9711005

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Possible Spin Polarization in a One-Dimensional Electron Gas

Autor: Thomas, K. J., Nicholls, J. T., Simmons, M. Y., Pepper, M., Mace, D. R., Ritchie, D. A.

In zero magnetic field, conductance measurements of clean one-dimensional (1D) constrictions defined in GaAs/AlGaAs heterostructures show twenty-six quantized ballistic plateaux, as well as a structure close to $0.7(2e^2/h)$. In an in-plane magnetic

Externí odkaz: http://arxiv.org/abs/cond-mat/9606004

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Re-entrant resonant tunneling

Autor: Kuznetsov, V. V., Savchenko, A. K., Raikh, M. E., Glazman, L. I., Mace, D. R., Ritchie, D. A., Linfield, E. H.

We study the effect of electron-electron interactions on the resonant-tunneling spectroscopy of the localized states in a barrier. Using a simple model of three localized states, we show that, due to the Coulomb interactions, a single state can give

Externí odkaz: http://arxiv.org/abs/cond-mat/9603006

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Ballistic Composite Fermions in Semiconductor Nanostructures

Autor: Frost, J. E. F., Liang, C. -T., Mace, D. R., Simmons, M. Y., Ritchie, D. A., Pepper, M.

We report the results of two fundamental transport measurements at a Landau level filling factor $\nu$ of 1/2. The well known ballistic electron transport phenomena of quenching of the Hall effect in a mesoscopic cross-junction and negative magnetore

Externí odkaz: http://arxiv.org/abs/cond-mat/9601063

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