Magnetic-field-induced transition in a wide parabolic well superimposed with a superlattice

Gusev, G. M.; Pusep, Yu. A.; Bakarov, A. K.; Toropov, A. I.; Portal, J. C.

doi:10.1103/physrevb.81.165302

Cited by 11 publications

(19 citation statements)

References 28 publications

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“…3(a). Depending on the magnetic field, two quantum phases with different distributions of the electron density over the wells were distinguished in this sample [15]. In a low magnetic field the SL responds as a stack of independent quantum wells connected in parallel [18].…”

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confidence: 96%

Magnetic field induced charge redistribution in artificially disordered quantum Hall superlattices

Santos¹,

Pusep²,

Gusev³

et al. 2012

EPL

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The photoluminescence from individual quantum wells of artificially disordered weakly coupled multi-layers embedded in wide AlGaAs parabolic wells was investigated in a strong magnetic field. We show that the response of the individual wells is very different from the average response of the multi-layers studied by transport measurements and that photoluminescence represents a local probe of the quantum Hall state formed in three-dimensional electron system. The observed magnetic field induced variations of the in-layer electron density demonstrate the formation of a new phase in the quasi-three-dimensional electron system. The sudden change in the local electron density found at the Landau filling factor ν = 1 by both the magneto-transport and the magneto-photoluminescence measurements was assigned to the quantum phase transition.

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confidence: 96%

Magnetic field induced charge redistribution in artificially disordered quantum Hall superlattices

Santos¹,

Pusep²,

Gusev³

et al. 2012

EPL

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“…Multiple layer electron systems are broadly used to explore electronic interaction effects due to a possibility of controlling the competition between intrawell and interwell electron-electron correlations [1][2][3][4][5][6][7] . A simplest realization of multiply layer system is a double quantum well (DQW) structure consisting of two well layers separated by a barrier which provides an important parameter determining the relative contributions of these correlations.…”

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confidence: 99%

Quantum oscillations of spin polarization in a GaAs/AlGaAs double quantum well

et al. 2012

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We employ the circular polarization-resolved magneto-photoluminescence technique to probe the spin character of electron and hole states in a GaAs/AlGaAs strongly coupled double quantum well system. The photoluminescence intensities of the lines associated with symmetric and antisymmetric electron states present clear out-of-phase oscillations between integer values of the filling factor ν and are caused by magnetic field induced changes in the population of occupied Landau levels near to the Fermi level of the system. Moreover, the degree of circular polarization of these emissions also exhibits the oscillatory behavior with increasing magnetic field. Both quantum oscillations observed in the PL intensities and in the degree of polarizations may be understood in terms of a simple single-particle approach model. The k · p method was used to calculate the photoluminescence peak energies and the degree of circular polarizations in the double quantum well structure as a function of the magnetic field. These calculations prove that the character of valence band states plays an important role in the determination of the degree of circular polarization and, thus, resulting in a magnetic field induced change of the polarization sign.

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“…4,21 Thus observed quantum Hall states are the uncorrelated ground states, while a manifestation of a new correlated quantum phase determined by the magnetic field induced redistribution of the electrons over the quantum wells was found in high mobility multiple layers. 5 In this work, in order to study low energy excitations of quantum Hall ferromagnetic in the vicinity of ν = 1, the same samples are examined by magnetophotoluminescence. The lowest energy charged excitations of quantum Hall ferromagnetic, skyrmions, 6,7 were observed in single GaAs quantum well by optically pumped nuclear magnetic resonance, 8 by polarized optical absorption [9][10][11] and recently, by polarized photoluminescence (PL).…”

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confidence: 99%

Magneto-optical probe of quantum Hall states in a wide parabolic well modulated by random potential

et al. 2012

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Polarized photoluminescence from weakly coupled random multiple well quasi-three-dimensional electron system is studied in the regime of the integer quantum Hall effect. Two quantum Hall ferromagnetic ground states assigned to the uncorrelated miniband quantum Hall state and to the spontaneous interwell phase coherent dimer quantum Hall state are observed. Photoluminescence associated with these states exhibits features caused by finite-size skyrmions: dramatic reduction of the electron spin polarization when the magnetic field is increased past the filling factor ν = 1. The effective skyrmion size is larger than in two-dimensional electron systems.

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Magnetic-field-induced transition in a wide parabolic well superimposed with a superlattice

Cited by 11 publications

References 28 publications

Magnetic field induced charge redistribution in artificially disordered quantum Hall superlattices

Magnetic field induced charge redistribution in artificially disordered quantum Hall superlattices

Quantum oscillations of spin polarization in a GaAs/AlGaAs double quantum well

Magneto-optical probe of quantum Hall states in a wide parabolic well modulated by random potential

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