Peierls instability due to d-wave pairing and stripe pattern of order-parameter distribution in two dimensionsShi-Jie Xiong and Zhi-Jie Qin
National Laboratory of Solid State Microstructures and Department of Physics, Nanjing University - Nanjing 210093, PRC
received 17 June 2005; accepted in final form 4 January 2006
published online 13 January 2006
We show that Peierls instability leading to stripe patterns occurs in two-dimensional systems with nearest-neighbor attractive interaction which is commonly used as a model Hamiltonian for d-wave superconductors. By a self-consistent calculation of order parameters for finite systems, we find that besides the usual d-wave component, a small amount of spatially modulated component emerges. This component partially removes the zero-energy nodes of the d-wave pairing and then reduces the energy. The periodic patterns are directly related to the Fermi wave vectors near half-filling. The effects of shift from the half-filling and disorder on stripe patterns are investigated.
74.20.Rp - Pairing symmetries (other than s-wave).
74.25.Jb - Electronic structure.
74.72.-h - Cuprate superconductors (high-Tc and insulating parent compounds).
© EDP Sciences 2006