Unconventional Ordering Phenomena in Cuprates

一般来说，强相关材料的物理学，特别是高温超导体的物理学，是由大量不同的可能的有序现象所支配的。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，有序波矢量可能与费米表面性质无关。这些顺序可能合作或竞争，导致零温度相变和有限温度性质由强顺序参数波动主导。这个项目的重点是对竞争有序现象的理论描述，掺杂莫特绝缘体的特征，包括它们在各种实验探针中的波动特征-存在于研究单位-如光电，中子和拉曼散射。研究将以铜超导体的有效低能模型为基础，采用场论和重整化群的方法以及蒙特卡罗模拟和平均场理论。

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.