Quantum Hall ferromagnet in a parabolic well

Gusev, G. M.; Quivy, A. A.; Lamas, T. E.; Leite, J. R.; Estibals, O.; Portal, J. C.

doi:10.1103/physrevb.67.155313

Cited by 27 publications

(18 citation statements)

References 30 publications

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“…6 that the phonon-induced conductivity is not negligibly small comparing to a typical value of impurity-induced conductivity, which is of the order of the conductance quantum for a partially filled Landau level. The disorder-mediated magnetoconductivity is noticeably smaller in wide parabolic quantum wells, 30 which represent the best system for observation of the discussed effect. Modern experimental techniques should be able to separate the two mechanisms, especially since the phonon-induced contribution to the conductivity has a distinguished two-peak structure and completely different magnetic field and temperature dependencies.…”

Section: ͑36͒mentioning

confidence: 97%

Electron-phonon scattering at the intersection of two Landau levels

2006

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We predict a double-resonant feature in the magnetic field dependence of the phonon-mediated longitudinal conductivity xx of a two-subband quasi-two-dimensional electron system in a quantizing magnetic field. The two sharp peaks in xx appear when the energy separation between two Landau levels belonging to different size-quantization subbands is favorable for acoustic-phonon transitions. One-phonon and two-phonon mechanisms of electron conductivity are calculated and compared. The phonon-mediated interaction between the intersecting Landau levels is considered and no avoided crossing is found at thermal equilibrium.

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Section: ͑36͒mentioning

confidence: 97%

Electron-phonon scattering at the intersection of two Landau levels

2006

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“…This is in contrast to more sharply defined features called resistance spikes which have also been observed within persistent minima in AlAs/GaAs, 10 GaAs/GaAlAs, 13 and (Cd,Mn)Te 14 and broad peaks in parabolic GaAs quantum wells which are relatively temperature independent. 11 The broad peak for the InSb system and its temperature evolution is shown in Fig. 2 at a fixed angle, = 65°, for = 2 and r = 1, and = 76.3°for = 3 and r = 2.…”

Section: Resultsmentioning

confidence: 98%

“…Similar observations of persistent minima have been reported in other semiconductor systems. [6][7][8][9][10][11][12][13][14] Particular to the InSb system however, is a broad resistance peak within the persistent minima that grows with increasing temperature. This is in contrast to more sharply defined features called resistance spikes which have also been observed within persistent minima in AlAs/GaAs, 10 GaAs/GaAlAs, 13 and (Cd,Mn)Te 14 and broad peaks in parabolic GaAs quantum wells which are relatively temperature independent.…”

Section: Resultsmentioning

confidence: 99%

“…When these single particle levels cross, the pseudospin degeneracy can be spontaneously broken by exchange and the system is said to pseudospin polarize. Both XY and Ising QHFs have been investigated in the integer regime using tilted magnetic fields [6][7][8][9][10][11] and/or gate voltages [12][13][14] to tune the levels into degeneracy; however the latter ordering is of particular interest, being characterized by first order phase transitions and the potential for hysteretic behavior.…”

Section: Introductionmentioning

confidence: 99%

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Ising quantum Hall ferromagnetism in InSb-based two-dimensional electronic systems

et al. 2004

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We report on the observation of Ising quantum Hall (QH) ferromagnetism in two-dimensional electronic systems based in single InSb/InAlSb quantum wells. Magneto-transport experiments in tilted magnetic fields reveal the preservation of the = 2 and = 3 QH states over the range in tilt angles where the single particle gap is expected to collapse for a noninteracting system. These preserved QH states are accompanied by broad resistance peaks which move towards higher filling factors as the tilt angle is increased and which display hysteresis. The maximum in the amplitude of these resistance peaks grows with increasing temperature and is activated as exp͑−1 / ͱ T͒.

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“…Recently, PQW's have been implemented to study non-linear optical properties [10,11], the quantum Hall effect [12,13], charge and spin oscillations in 3D gases [14,15], magnetic properties for the spin electronics [16,17], and band gap discontinuities in materials with outstanding characteristics [18,19].…”

Section: Introductionmentioning

confidence: 99%

Electronic Spectrum Study of Parabolic Gaas/Al_{x}ga_{1-X}as Superlattices

Rodrı́guez-Vargas¹,

Sanchez-Barbosa²,

Contreras-Solorio³

et al. 2008

PIER Letters

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Abstract-The electronic structure of finite parabolic GaAs/Al x Ga 1−x As superlattices is studied. A detailed analysis of the miniband formation is given and the importance of all system parameters is discussed. The dependence of the equidistant miniband separation on the superlattice size is revealed. A comparison with different theoretical methods and experimental data is presented.The calculations are conducted in the framework of the semi-empirical sp 3 s * tight-binding model including spin applying the Green function formalism and the Surface Green Function Matching Method (SGFM) method.

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Quantum Hall ferromagnet in a parabolic well

Cited by 27 publications

References 30 publications

Electron-phonon scattering at the intersection of two Landau levels

Electron-phonon scattering at the intersection of two Landau levels

Ising quantum Hall ferromagnetism in InSb-based two-dimensional electronic systems

Electronic Spectrum Study of Parabolic Gaas/Al_{x}ga_{1-X}as Superlattices

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