2D Symmetry and Pinning of Quantum-Hall "Strip Phase"
RUSSIAN ACADEMY OF SCIENCES MOSCOW INST OF RADIO ENGINEERING AND ELECTRONICS
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Recent experiments on 001 GaAsAlGaAs structures revealed a new phase in the excited Landau levels. The results can be related to spontaneous formation of undirectional charge density waves strip phase. We address to the unsolved problem why stripes are pinned coherently across the sample along 110. Developing the Kroemers idea about the role of C2v symmetry in this system we show that for 001 A3B5 single heterojunction the conduction hand in-plane effective mass is anisotropic. This anisotropy and the optical anisotropy in heterostructures with different cations and anions have the same origin. Although very weak, the difference in the conduction hand effective masses along the crystallographic 110 and 110 axes may define the direction of the stripes. The results agree with the experiments in tilted magnetic fields.
- Solid State Physics