U.S.-France Cooperative Research: Disorder-Driven Quantum Phase Transitions

美法合作研究：无序驱动的量子相变

• 批准号: 0124863
• 负责人: Richard Scalettar
• 金额: $ 1.4万
• 依托单位: University of California-Davis
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2002
• 资助国家: 美国
• 起止时间: 2002-03-01 至 2005-02-28
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0124863&HistoricalAwards=false
• 关键词: U.S.; France; Cooperative; Research; Disorder

0124350ScalettarThis two-year award supports U.S.-France collaboration in materials research between Richard T. Scalettar, University of California, Davis, and George Batrouni of the University of Nice. The project addresses the problem of interacting, disordered electron systems. The objective is to determine quantum phase transitions in disordered superfluids and superconductors using Quantum Monte Carlo (QMC) methods. The investigators will conduct numerical simulations of the Boson-Hubbard model for superfluids and of supersolid formation in the Fermion-Hubbard model. The US investigator brings to the collaboration expertise in fermion determinant QMC methods. This is complemented by French expertise in dual algorithm bosonic QMC.Disordered electron systems exhibit remarkable properties including universal conductivity, two-dimensional metal-insulator and superconductor insulator phase transition, zero temperature liquid behavior and novel glassy phases. These systems represent fundamental problems in solid state physics and have important technological applications. This award represents the US side of parallel proposals to the NSF and the French National Center for Scientific Research (CNRS). NSF will cover travel funds and living expenses of the US investigator and student. The CNRS will support the visits of the French researchers. The collaboration will advance fundamental understanding of disordered electron systems in solid state physics and provides an international research training opportunity for a US student.

0124350 Scalettar这个为期两年的奖项支持美国-法国材料研究合作，理查德T。Scalettar，加州大学戴维斯分校和尼斯大学的乔治巴特鲁尼。 该项目解决了相互作用的无序电子系统的问题。 目标是用量子蒙特卡罗（QMC）方法确定无序超流体和超导体中的量子相变。研究人员将对超流体的玻色子-哈伯德模型和费米子-哈伯德模型中的超固体形成进行数值模拟。 美国研究人员带来了合作的专业知识，在费米子行列式QMC方法。 无序电子系统表现出显著的性质，包括普适导电性、二维金属-绝缘体和超导体-绝缘体相变、零温液态行为和新颖的玻璃相。这些系统代表了固体物理学中的基本问题，并具有重要的技术应用。该奖项代表了美国方面向NSF和法国国家科学研究中心（CNRS）提出的平行建议。 NSF将支付美国研究员和学生的差旅费和生活费。 法国国家科学研究中心将为法国研究人员的访问提供支持。该合作将推进对固态物理中无序电子系统的基本理解，并为美国学生提供国际研究培训机会。