Evidence for an Anisotropic State of Two-Dimensional Electrons in High Landau Levels

Abstract

Magneto-transport experiments on high mobility two-dimensional electron gases in GaAs/AlGaAs heterostructures have revealed striking anomalies near half-filling of several spin-resolved, yet highly excited, Landau levels. These anomalies include strong anisotropies and non-linearities of the longitudinal resistivity rho_xx which commence only below about 150mK. These phenomena are not seen in the ground or first excited Landau level but begin abruptly in the third level. Although their origin remains unclear, we speculate that they reflect the spontaneous development of a generic anisotropic many-electron state.

4 pages with 5 figures, to be published in Phys. Rev. Letters, new figure added (Fig. 4)

References in corpus (1)

• Composite Fermions in Modulated Structures: Transport and Surface Acoustic Waves

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• Valley polarization of Landau levels driven by residual strain in the ZrSiS surface band
• Emergent Time Crystal with Tunable Period in the Uniaxial Random Field XY Magnet
• Hartree-Fock energy of a density wave in a spin polarized two-dimensional electron gas
• Stripe formation driven by space noncommutativity in quantum Hall systems
• Competing quantum Hall phases in the second Landau level in low density limit
• Neutral Collective Excitations in Striped Hall States
• Cavity QED Control of Quantum Hall Stripes
• Theory of Striped Hall Ferromagnets
• Induced Chern-Simons term of a paired electron state in the quantum Hall system
• Electronic band structure in $n$-type GaAs/AlGaAs wide quantum wells in tilted magnetic field
• Anisotropic conductivity tensor on a half-filled high Landau level
• Metastable anisotropy orientation of nematic quantum Hall fluids
• Paired and Stripe States in the Quantum Hall System
• Exploring Quantum Hall Physics at Ultra-Low Temperatures and at High Pressures
• Heterostructure design to achieve high quality, high density GaAs 2D electron system with $g$-factor tending to zero
• New topological excitations and melting transitions in quantum Hall systems