2D Symmetry and Pinning of Quantum-Hall "Strip Phase"
Abstract
Recent experiments on (001) GaAs/AlGaAs 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 Kroemer's idea about the role of (C2v) symmetry in this system we show that for (001) A(3)B(5) 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.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jun 23, 2000
- Accession Number
- ADP013015
Entities
People
- E. E. Takhtamirov
- V. A. Volkov
Organizations
- Russian Academy of Sciences