Novel Quantum Phases in Unconventional Insulators
非常规绝缘体中的新型量子相
基本信息
- 批准号:EP/V011405/1
- 负责人:
- 金额:$ 204.12万
- 依托单位:
- 依托单位国家:英国
- 项目类别:Fellowship
- 财政年份:2022
- 资助国家:英国
- 起止时间:2022 至 无数据
- 项目状态:未结题
- 来源:
- 关键词:
项目摘要
My research programme aims to discover new quantum phases. Billions of electrons interact with each other to yield quantum entangled phases of matter with striking new properties distinct from those of single electrons. In 'classical' tuning, phases of matter can transform between each other when their environment is altered using temperature as a tuning tool. For example, ice melts to water, which boils to steam when the temperature is increased. In quantum tuning, parameters other than temperature are used to transform the system between quantum phases at low temperatures. Examples of unconventional phases of matter that emerge from more familiar phases include the striking case where superconductivity - an exotic phase of matter that transports electricity without any resistance to its flow - emerges from a magnetic metal, when high pressures or chemical substitution is applied.Here, I propose to search for new quantum phases of matter by exploring the little understood regime near correlated insulators, where strong interactions between constituent electrons prohibit electrical transport. Theoretical models and preliminary experiments suggest that strong interaction between electrons in this region offers fertile ground for the discovery of new exotic phases of matter.In this research programme, we propose to experimentally study two different classes of correlated insulators for the emergence of novel quantum phases. Firstly we explore the copper-oxide family of materials in which superconductivity at high temperatures emerges upon introducing mobile charge carriers in a parent magnetic insulator. We will experimentally explore theoretical predictions for new intermediate phases of matter that emerge in vicinity of strongest superconductivity, proving markedly different from the better-understood case of superconductivity that emerges from a metallic magnet.Secondly we explore the newly discovered family of unconventional insulators that simultaneously display dichotomous metallic and insulating behaviours. In these materials, despite the bulk of the material exhibiting electrically insulating properties that correspond to virtually immobile electrons, complementary measurements unexpectedly reveal signatures of circulating electron orbits as expected for a bulk metal. Beginning from this unconventional insulating phase of matter, we aim to uncover various novel intermediate phases that emerge enroute to these materials' ultimate transformation to more conventional metals under a combination of applied pressure and high magnetic field.The discovery of such novel quantum phases of matter, and their ultimate control is crucial for the next generation of quantum electronics based on strongly entangled many-body instead of single electron quantum physics. As such, this study will prove a key element in the development of next generation quantum technologies, a grand challenge identified by the EPSRC. I propose to study a theoretically motivated selection of correlated insulating materials under a combination of extreme conditions of high pressures in strong magnetic fields and low temperatures in this fellowship, and expect to discover new paradigms of novel intermediate phases of matter, and unusual modes of transformation between these unconventional phases of matter.
我的研究计划旨在发现新的量子相。数十亿个电子相互作用,产生物质的量子纠缠相,这些相具有与单电子不同的惊人的新特性。在“经典”调谐中,当使用温度作为调谐工具改变环境时,物质的相位可以相互转换。例如,冰融化成水,当温度升高时,水沸腾成蒸汽。在量子调谐中,除了温度之外的参数用于在低温下在量子相位之间转换系统。物质的非常规相是由更熟悉的相演变而来的,其中包括一个引人注目的例子,即当施加高压或化学替代时,超导性--一种物质的奇异相,它可以在没有任何阻力的情况下传输电流--从磁性金属中出现。在这里,我建议通过探索相关绝缘体附近鲜为人知的区域来寻找物质的新量子相,其中组成电子之间的强相互作用阻止电传输。理论模型和初步的实验表明,在这个区域的电子之间的强相互作用提供了肥沃的土壤,发现新的异国情调phase的matter.In本研究计划中,我们建议实验研究两种不同类别的相关绝缘体的出现新的量子phase。首先,我们探讨铜氧化物家族的材料中,在高温超导性出现后,在母体磁性绝缘体中引入移动的电荷载流子。我们将通过实验探索最强超导附近出现的新的中间相物质的理论预测,证明与更好理解的金属磁体中出现的超导情况明显不同。其次,我们将探索新发现的非常规绝缘体家族,它们同时显示出二分的金属和绝缘行为。在这些材料中,尽管大部分材料表现出对应于几乎不动的电子的电绝缘性质,但互补测量出乎意料地揭示了如对于大块金属所预期的循环电子轨道的特征。从物质的这种非常规绝缘相开始,我们的目标是揭示各种新的中间相,这些中间相在施加压力和高磁场的组合下最终转化为更常规的金属。这种新的物质量子相的发现,它们的最终控制对于基于强纠缠多体而不是单电子量子物理的下一代量子电子学至关重要。因此,这项研究将成为下一代量子技术发展的关键因素,这是EPSRC确定的一项重大挑战。我建议在这个奖学金中,在强磁场和低温高压的极端条件下,研究相关绝缘材料的理论动机选择,并期望发现新的物质中间相的新范例,以及这些非常规物质相之间的不寻常的转换模式。
项目成果
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