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1
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Spin Transition in a Correlated Liquid οf Composite Fermions

100%
Wójs A., Quinn J.
Acta Physica Polonica A
|
2009
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vol. 115
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issue 1
153-155
EN
We study spin polarization of the ν_e=4/11 fractional quantum Hall state corresponding to the ν=1/3 filling of the second composite fermion Landau level, and predict a spin phase transition in realistic systems.
2
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Composite Fermions and the Fractional Quantum Hall Effect

100%
Wójs A., Quinn J.
|
|
vol. 96
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issue 5
593-602
EN
The mean field composite fermion picture successfully predicts low lying states of fractional quantum Hall systems. This success cannot be attributed to a cancellation between the Coulomb and Chern-Simons interactions beyond the mean field and solely depends on the short-range of the Coulomb pseudopotential in the lowest Landau level. The class of pseudopotentials for which the mean field composite fermion picture can be applied is defined. The success or failure of the mean field composite fermion picture in various systems (electrons in excited Landau levels, Laughlin quasiparticles, charged magnetoexcitons) is explained.
3
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Excitations of the Moore-Readν=5/2 State: Three-Body Correlations and Finite-Size Effects on a Sphere

100%
Wόjs A., Quinn J.
Acta Physica Polonica A
|
2004
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vol. 105
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issue 6
575-584
EN
Correlations in partially filled electron and composite fermion Landau levels are studied numerically. Insight into the nature of the correlations is obtained by using model pair pseudopotentials. Energy spectra of a model short-range three-body repulsion are calculated. Moore-Read ground state at the half-filling and its quasielectron, quasihole, magnetoroton, and pair-breaking excitations are all identified. The quasielectron/quasihole excitations are described by a composite fermion model for Laughlin-correlated electron pairs. Comparison of energy spectra and wavefunction overlaps obtained for different pseudopotentials suggests that finite-size effects can be important in numerical diagonalization studies on a sphere.
4
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Condensation of Nonabelian Moore-Read Quasiholes in Correlated Composite Fermion Liquids

81%
Wodziński D., Wójs A., Quinn J.
Acta Physica Polonica A
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2006
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vol. 110
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issue 3
417-422
EN
Two- and three-body correlation functions (number of pairs or triplets vs. relative angular momentum) of electrons or Laughlin quasielectrons (i.e., composite fermions in their first excited Landau level) are studied numerically in several fractional quantum Hall liquids. It is shown directly that theν_e=4/11 liquid (corresponding to aν=1/3 filling of composite fermions in their first excited Landau level) is a paired state of quasielectrons, hence interpreted as a condensate of "second-generation" quasiholes of Moore-Readν=1/2 state of composite fermions.
5
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Pair-Distribution Functions of Laughlin Quasielectrons in Partially Filled Composite Fermion Levels

81%
Wodziński D., Wójs A., Quinn J.
Acta Physica Polonica A
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2005
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vol. 108
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issue 5
909-914
EN
Pair-distribution functions g(r) of the Laughlin quasielectrons are calculated in the fractional quantum Hall states at electron filling factorsν=4/11 and 3/8. They all have a shoulder at a medium range, supporting the idea of quasielectron cluster formation. The intra- and inter-cluster contributions to g(r) are identified. The average cluster sizes are estimated; pairs and triplets of quasielectrons are suggested atν=4/11 and 3/8, respectively.
6
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Fractional Quasiexcitons in Photoluminescence of Quantum Hall Liquids

81%
Wójs A., Gładysiewicz A., Quinn J.
Acta Physica Polonica A
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2005
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vol. 108
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issue 5
923-928
EN
Realistic calculations of photoluminescence spectra for a 20 nm quantum well at a filling factorν=1/3 are presented. The new states formed from charged excitons (trions) by correlation with the surrounding electrons are identified. These "quasiexcitons" differ from usual excitons and trions by having fractionally charged constituents. Their binding energies and emission intensities depend on the involved trion, leading to discontinuity in photoluminescence.
7
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Pairing and Condensation of Laughlin Quasiparticles in Fractional Quantum Hall Systems

81%
Wójs A., Yi K., Quinn J.
Acta Physica Polonica A
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2003
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vol. 103
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issue 6
517-523
EN
From the analysis of their interaction pseudopotentials, it is argued that (at certain filling factors) Laughlin quasiparticles can form pairs. It is further proposed that such pairs could have Laughlin correlations with one another and form condensed states of a new type. The sequence of fractions corresponding to these states includes all new fractions observed recently in experiment (e.g.,ν=5/13, 3/8, or 4/11).
8
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Spin Phase Transition in a Correlated Composite Fermion Liquid

81%
Wójs A., Simion G., Wodziński D., Quinn J.
Acta Physica Polonica A
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2007
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vol. 112
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issue 2
153-156
EN
We study spin polarization of the ν_e=4/11 fractional quantum Hall state corresponding to the ν=1/3 filling of the second composite fermion Landau level, and predict a spin phase transition in realistic systems.
9
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Trion Binding Energies and Wave Functions in Doped Quantum Wells

81%
Gładysiewicz A., Wójcik K., Wójs A., Quinn J.
Acta Physica Polonica A
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2005
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vol. 108
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issue 4
669-674
EN
The energy spectra of negative trions (X^-=2e+h) in one-sided doped GaAs quantum wells are calculated. The maps of the trion binding energyΔ as a function of well width w, electron concentration n, and the magnetic field B are obtained. The dependence of the trion ground state ("bright singlet" versus "dark triplet") on those parameters is established.
10
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Ising Ferromagnetism of Composite Fermions

62%
Výborný K., Čertík O., Pfannkuche D., Wodziński D., Wójs A., Quinn J.
Acta Physica Polonica A
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2006
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vol. 110
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issue 3
409-415
EN
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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