Transport anisotropy in Ge quantum wells in the absence of quantum oscillations

Article

关键词: 2-DIMENSIONAL ELECTRON-GAS;    RANDOM MAGNETIC-FIELD;    HIGH LANDAU-LEVELS;    GAAS-ALXGA1-XAS HETEROSTRUCTURES;    MAGNETORESISTANCE;    STATE;    SYSTEMS;    LIQUID;    CRYSTALLIZATION;    RESISTANCE;   

DOI  :  10.1103/PhysRevB.92.161405

来源: SCIE

【 摘 要 】

A recent study of a high-mobility two-dimensional hole gas in a strained Ge quantum well revealed strong transport anisotropy in the quantum Hall regime when the magnetic field was tilted away from the sample normal [Q. Shi, M. A. Zudov, C. Morrison, and M. Myronov, Phys. Rev. B 91, 201301( R) (2015)]. In the present study we demonstrate that the anisotropy persists to such high temperatures and filling factors that quantum oscillations are no longer observed. This finding rules out the formation of a stripe phase as a possible origin for the observed anisotropy. However, we also show that the observed anisotropy is not consistent with other known anisotropies, such as those arising from finite-thickness effects or surface roughness.

【 授权许可】

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