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arXiv · 1502.03047

Fermi Contour Disintegration of Quasi-2D Electrons in Parallel Magnetic Fields

M. A. Mueed·D. Kamburov·M. Shayegan·L. N. Pfeiffer·K. W. West·K. W. Baldwin·R. Winkler
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Abstract

In a quasi two-dimensional electron system with non-zero layer thickness, a parallel magnetic field (B||) can couple to the out-of-plane electron motion and lead to a severe distortion and eventual disintegration of the Fermi contour. Here we directly and quantitatively probe this evolution through commensurability and Shubnikov-de Haas measurements on electrons confined to a 40-nm-wide GaAs (001) quantum well. We are able to observe the Fermi contour disintegration phenomenon, in good agreement with the results of semi-classical calculations. Experimentally we also observe intriguing features, suggesting magnetic-breakdown-type behavior when the Fermi contour disintegrates.

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M. A. Mueed, D. Kamburov, M. Shayegan, L. N. Pfeiffer, K. W. West, K. W. Baldwin, R. Winkler. 2015-06-11. Fermi Contour Disintegration of Quasi-2D Electrons in Parallel Magnetic Fields. https://arxiv.org/abs/1502.03047

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