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Effect of Disorder on Spin and Charge Excitations in the Fractional Quantum Hall Effect

100%

Výborný K., Müller C., Dethlefsen A., Haug R., Wójs A.

Acta Physica Polonica A

2007

vol. 112

issue 2

249-254

A simple model of disorder in fractional quantum Hall systems is combined with the standard exact diagonalisation technique. Electron-density-dependent gaps at filling factors 1/3,2/3,2/5, and 3/5 measured by activated transport can then be fitted with a single reasonable value of d which has the meaning of the separation of ionized donors from the quasi-2D electron gas.

Ising Ferromagnetism of Composite Fermions

86%

Výborný K., Čertík O., Pfannkuche D., Wodziński D., Wójs A., Quinn J.

The quantum Hall ferromagnets at the half-filling of a pair of degenerate electron or composite fermion Landau levels are studied by exact numerical diagonalization. The results obtained using open and closed geometries (rectangular - with periodic boundary conditions and spherical) are compared. The ferro- and paramagnetic ground states are identified in finite-size energy spectra, and the pair-correlation functions are used in search of the domain structure at half-polarization.

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2 Acta Physica Polonica A

1 2007

1 2006

2 Výborný K.

2 Wójs A.

1 Dethlefsen A.

1 Haug R.

1 Müller C.

1 Pfannkuche D.

1 Quinn J.

1 Wodziński D.

1 Čertík O.

Search results

Effect of Disorder on Spin and Charge Excitations in the Fractional Quantum Hall Effect

Ising Ferromagnetism of Composite Fermions