材料科学
质量(理念)
电子
纳米技术
工程物理
光电子学
物理
量子力学
作者
Yoon Jang Chung,K. A. Villegas Rosales,K. W. Baldwin,P. T. Madathil,K. W. West,M. Shayegan,L. N. Pfeiffer
出处
期刊:Nature Materials
[Springer Nature]
日期:2021-02-25
卷期号:20 (5): 632-637
被引量:82
标识
DOI:10.1038/s41563-021-00942-3
摘要
Two-dimensional electrons confined to GaAs quantum wells are hallmark platforms for probing electron–electron interactions. Many key observations have been made in these systems as sample quality has improved over the years. Here, we present a breakthrough in sample quality via source-material purification and innovation in GaAs molecular beam epitaxy vacuum chamber design. Our samples display an ultra-high mobility of 44 × 106 cm2 V–1 s–1 at an electron density of 2.0 × 1011 cm–2. These results imply only 1 residual impurity for every 1010 Ga/As atoms. The impact of such low impurity concentration is manifold. Robust stripe and bubble phases are observed, and several new fractional quantum Hall states emerge. Furthermore, the activation gap (Δ) of the fractional quantum Hall state at the Landau-level filling (ν) = 5/2, which is widely believed to be non-Abelian and of potential use for topological quantum computing, reaches Δ ≈ 820 mK. We expect that our results will stimulate further research on interaction-driven physics in a two-dimensional setting and substantially advance the field. Source-material purification and optimized vacuum chamber design lead to a breakthrough in GaAs sample quality.
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