Koduvayur SP, Lyanda-Geller Y, Khlebnikov S, Csathy G, Manfra MJ, Pfeiffer LN, West KW, Rokhinson LP. Effect of strain on stripe phases in the quantum Hall regime.
PHYSICAL REVIEW LETTERS 2011;
106:016804. [PMID:
21231765 DOI:
10.1103/physrevlett.106.016804]
[Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/18/2010] [Indexed: 05/30/2023]
Abstract
Preferential orientation of the stripe phases in the quantum Hall (QH) regime has remained a puzzle since its discovery. We show experimentally and theoretically that the direction of high and low resistance of the two-dimensional (2D) hole gas in the QH regime can be controlled by an external strain. Depending on the sign of the in-plane shear strain, the Hartree-Fock energy of holes or electrons is minimized when the charge density wave (CDW) is oriented along the [110] or [110] directions. We suggest that shear strains due to internal electric fields in the growth direction are responsible for the observed orientation of CDW in pristine electron and hole samples.
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