Excitations in Landau Levels of Two-dimensional Quantum Fluids

****技术摘要****该奖项支持二维电子系统中有趣的涌现量子相的研究。显著的电子液相发生在高质量的半导体异质结构在大磁场。这项研究利用低洼模式的测量来揭示令人兴奋的物理现象，这些物理现象表明，在二维空间中，独特的库仑相互作用会产生新的电子物质。在这里，部分分布在较高朗道能级的是显著状态的宿主，比如在第二朗道能级中出现的迷人的偶数和奇数分母分数量子霍尔流体。电荷和/或自旋自由度的激发将通过独特的共振非弹性光散射方法在低于50毫开尔文度的低温下测量，这是在稀释冰箱中实现的。该奖项将支持研究生的博士论文研究，并使高素质的本科生参与这些项目。这项研究将揭示基本的多电子相互作用的物理学，这将极大地扩展强相互作用低维电子系统研究的前沿。****非技术摘要****人工高质量半导体异质结中的电子系统嵌入高磁场时，会显示出引人入胜的相，表现出量子力学的惊人怪异。主要的兴趣是有趣的偶数和奇分母分数量子霍尔效应态在第二朗道能级。这个项目是一个探索，在低洼激发模式的测量中，通过先进的光散射方法在非常低的温度下，揭示了令人兴奋的新电子物理，来自于降维半导体中的量子相互作用。新型的低维电子系统引起了广泛的关注。了解他们的基础物理学和材料科学的进步推进了当代和未来电子和光电子技术的最新技术。在基础科学方面，这项研究吸引了世界级的科学家，他们致力于相互作用物理学的主题，寻求当前前沿问题的答案。该项目为有兴趣参与凝聚态科学前沿研究的高素质本科生和研究生以及博士后提供了机会。

****Technical Abstract****This award supports studies of intriguing emergent quantum phases in two-dimensional electron systems. The striking electron liquid phases occur in highest quality semiconductor hetero-structures in large magnetic fields. This research employs measurements of low-lying modes to uncover exciting physics that dictates the emergence of novel electron matter from unique Coulomb interactions in two-dimensions. Here, partially populated higher Landau levels are hosts to remarkable states like the fascinating even- and odd-denominator fractional quantum Hall fluids that occur in the second Landau level. Excitations in charge and/or spin degrees of freedom will be measured by unique resonant inelastic light scattering methods at low temperatures below 50milliKelvin degrees that are achieved in dilution refrigerators. The award will support the PhD dissertation research of a graduate student and enable the participation in these projects of highly qualified undergraduate students. This research should uncover physics of fundamental many-electron interactions that would greatly expand the frontiers of studies of strongly interacting low-dimensional electron systems.****Non-Technical Abstract****When embedded in high magnetic fields electron systems in artificial high quality semiconductor hetero-junctions display intriguing phases that manifest the striking weirdness of quantum mechanics. Of primary interest are the intriguing even- and odd-denominator fractional quantum Hall effect states in the second Landau level. This project is a quest in which measurements of low-lying excitation modes, by advanced light scattering methods at very low temperatures, uncover exciting new electron physics that emanates from quantum interactions in reduced dimensionality semiconductors. Novel low-dimensional electron systems attract broad attention. Progress in understanding their fundamental physics and their materials science advance the state-of-the-art in technologies of contemporary and future electronics and optoelectronics. In fundamental science the research appeals to world-class scientists working on topics of interaction physics that seek answers to questions that are at current frontiers. The project offers opportunities to highly qualified undergraduate and graduate students, as well as postdocs interested in participation in research at frontiers of condensed matter science.