Unconventional Ordering Phenomena in Cuprates

强关联材料的物理学，特别是高温超导体的物理学，被大量不同的可能的有序现象所支配。它们中的许多可以被描述为非常规的：内部对称性可能不同于s波，并且有序波矢可能与费米表面性质无关。这些订单可能会合作或竞争，导致零温度相变和有限温度的性质是由强序参数波动为主。该项目的重点是竞争有序现象的理论描述，掺杂莫特绝缘体的特性，包括他们在各种实验探针的波动签名-目前在研究单位-如光电发射，中子，和拉曼散射。这些研究将基于铜氧化物超导体的有效低能模型，使用场论和重整化群以及蒙特卡罗模拟和平均场理论的方法。

The physics of strongly correlated materials in general and of high-temperature superconductors in particular is dominated by a plethora of different possible ordering phenomena. Many of them can be characterized as unconventional: The internal symmetry may be different from s-wave, and the ordering wavevector may be unrelated to Fermi surface properties. These orders may co-operate or compete, leading to zero-temperature phase transitions and finite-temperature properties being dominated by strong order parameter fluctuations. The focus of this project is the theoretical description of competing ordering phenomena, characteristic of doped Mott insulators, including signatures of their fluctuations in various experimental probes – present in the Research Unit – such as photoemission, neutron, and Raman scattering. The studies will be based on effective low-energy models for cuprate superconductors, using methods of field theory and renormalization group as well as Monte Carlo simulations and mean-field theories.