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

0124350Scalettar这个为期两年的奖项支持美国和法国在材料研究方面的合作，合作伙伴是加州大学戴维斯分校的理查德·T·斯卡莱塔和尼斯大学的乔治·巴特鲁尼。该项目解决了相互作用的、无序的电子系统的问题。目的是用量子蒙特卡罗(QMC)方法确定无序超流和超导体中的量子相变。研究人员将对超流体的玻色子-哈伯德模型进行数值模拟，并在费米子-哈伯德模型中进行超固体形成的数值模拟。这位美国研究人员为合作带来了费米子决定QMC方法方面的专业知识。法国在双算法玻色子QMC方面的专业知识补充了这一点。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绝缘体相变、零温液体行为和新的玻璃相。这些系统代表了固体物理中的基本问题，并具有重要的技术应用。这一奖项代表了美国方面对NSF和法国国家科学研究中心(CNRS)的平行建议。NSF将支付这名美国调查员和学生的旅费和生活费。国家科学研究中心将支持法国研究人员的访问。这项合作将促进对固体物理学中无序电子系统的基本理解，并为美国学生提供一个国际研究培训机会。

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.