Spectroscopy of Electron Liquids in Quantum Structures

该个人研究者奖将支持量子霍尔体制下二维电子液体低洼激发模式的先进光谱学研究。由PI和合作者开发的非弹性光散射方法将获得自旋或电荷自由度中的集体激发。主要的兴趣是在非常低的温度下，当电子在高度完美的系统中占据更高的朗道能级时，许多粒子系统的不同和竞争的量子相出现。由于完全由电子组成，量子霍尔体系中的电子流体和固体是物质的独特相，它们在极低的温度和高磁场下出现，并由电子之间的基本库仑相互作用的影响产生。在这些有趣的相中，磁场的微小变化可能会改变准粒子的统计数据，从费米子到玻色子，甚至到任意子。这一研究的目标是发现和阐明这些相互竞争的物质量子相的物理学。更广泛的影响源于通过提供以前无法获得的关于物质惊人量子相的见解来推进该领域的前景。PI的小组有很强的女性和少数民族代表，与美国和国外的顶尖科学家有着重要的联系。当自旋（类似于附着在电子上的小磁铁）或包含许多电子的系统的电子电荷存在于某种称为“量子霍尔制度”的状态时，包含它们的材料的新电子特性就会出现。这些特性将使用由PI和他的合作者开发的涉及光反射的方法来测量。当几乎完美的人造半导体结构中的电子被限制在垂直于平面的磁场下在平面上运动时，量子霍尔状态发生在非常低的温度下。这组电子构成了一个流体或固体粒子系统，并且处于一种独特的物质状态，这种状态源于每个电子都带有电荷，导致它们之间发生相互作用。在这些正在研究的有趣的电子系统中，电子的集体运动被称为“准粒子”。它们可能具有不同的特性，这些特性可以通过对系统施加微小的磁场变化而改变。计划研究的目标是发现和阐明在这些电子系统中出现的竞争电子状态起源的物理学。这项研究引起了国际科学家和普通公众的兴趣，他们对基本电子性质的表现及其潜在应用感到惊讶。PI小组为不同群体的学生和初级科学家提供了参与世界级研究的重要机会。

TechnicalThis individual investigator award will support advanced optical spectroscopy studies of low-lying excitation modes of two-dimensional electron liquids in quantum Hall regimes. Collective excitations in the spin or charge degrees of freedom will be accessed by inelastic light scattering methods developed by the PI and collaborators. The primary interests are on the diverse and competing quantum phases of many particle systems that emerge at very low temperatures when electrons populate higher Landau levels in highly perfect systems. Being composed solely of electrons, the electron fluids and solids in the quantum Hall regimes are unique phases of matter that emerge at very low temperatures and high magnetic fields and that arise from the impact of fundamental Coulomb interactions among electrons. In these intriguing phases small changes in magnetic field may alter the statistics of quasiparticles from fermions to bosons and even to anyons. The goals of this body of research are the discovery and elucidation of the physics in these competing quantum phases of matter. The broader impacts stem from prospects of advancing the field by offering previously unavailable insights on striking quantum phases of matter. The group of the PI has strong representation of women and minorities, and significant links to leading scientists in the US and abroad.Non TechnicalWhen the spin, which is analogous to a small magnet attached to the electron, or electrical charge of electrons of systems containing many electrons existing in a certain state called the "quantum Hall regime" new electronic properties of the material containing them emerge. These properties will be measured using methods involving the reflection of light that were developed by the PI and his collaborators. The quantum Hall regimes occur at very low temperatures when electrons in nearly perfect man-made semiconductor structures are restricted to move on a flat plane with a magnetic field applied perpendicular to this plane. This group of electrons makes up a fluid or solid system of particles and is in a unique state of matter that emerges from the fact that each electron has a charge causing interactions to occur among them. In these intriguing electron systems under study, the collective motion of electrons is represented by what is known as ?quasiparticles? that may assume different characteristics that can be altered by applying small magnetic field changes to the system. The goal of the projected research is the discovery and elucidation of the physics that is at the origin of the competing electron states that emerge in these many electron systems. The research is of interest to an international community of scientists and to the general public that is amazed by manifestations of basic electron properties and their potential applications. The group of the PI offers significant opportunities to diverse groups of students and junior scientists to participate in world-class research.