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# Search results

122 records were found.

## Anisotropic low-temperature piezoresistance in (311)A GaAs two-dimensional holes

Comment: 4 pages. Submitted to Applied Physics Letters

## Valley polarization and susceptibility of composite fermions around nu=3/2

Comment: to appear in Phys. Rev. Lett

## Anomalous giant piezoresistance in AlAs 2D electrons with anti-dot lattices

Comment: 4 figures, submitted for publication

## NMR Study of Large Skyrmions in Al_{0.13}Ga_{0.87}As Quantum Wells

Comment: to appear in PRB

## Spin Susceptibility of Interacting Two-dimensional Electrons with Anisotropic Effective Mass

Comment: 4 pages, 3 figures, accepted for publication in Phys. Rev. B

## Spin Orientation of Holes in Quantum Wells

Comment: 14 pages, 8 figures

## Anomalous robustness of the 5/2 fractional quantum Hall state near a sharp phase boundary

We report magneto-transport measurements in wide GaAs quantum wells with tunable density to probe the stability of the fractional quantum Hall effect at filling factor $\nu =$ 5/2 in the vicinity of the crossing between Landau levels (LLs) belonging to the different (symmetric and antisymmetric) electric subbands. When the Fermi energy ($E_F$) lies in the excited-state LL of the symmetric subband, the 5/2 quantum Hall state is surprisingly stable and gets even stronger near this crossing, and then suddenly disappears and turns into a metallic state once $E_F$ moves to the ground-state LL of the antisymmetric subband. The sharpness of this disappearance suggests a first-order transition.

## Effective Mass and Spin Susceptibility of Dilute Two-Dimensional Holes in GaAs

Comment: 7 pages, 7 figures

## Observation of reentrant quantum Hall states in the lowest Landau level

Measurements in very low disorder two-dimensional electrons confined to relatively wide GaAs quantum well samples with tunable density reveal reentrant $\nu=1$ integer quantum Hall states in the lowest Landau level near filling factors $\nu=4/5$ and 6/5. These states are not seen at low densities and become more prominent with increasing density and in wider wells. Our data suggest a close competition between different types of Wigner crystal states near these fillings. We also observe an intriguing disappearance and reemergence of the $\nu=4/5$ fractional quantum Hall effect with increasing density.

## Spin and charge distribution symmetry dependence of stripe phases in two-dimensional electron systems confined to wide quantum wells

Measurements in clean two-dimensional electron systems confined to wide GaAs quantum wells in which two electric subbands are occupied reveal an unexpected rotation of the orientation of the stripe phase observed at a half-filled Landau level. Remarkably, the reorientation is sensitive to the spin of the half-filled Landau level and the symmetry of the charge distribution in the quantum well.
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