Volume 73, Number 4, February 2006
|Page(s)||581 - 586|
|Section||Condensed matter: electronic structure, electrical, magnetic, and optical properties|
|Published online||13 January 2006|
Peierls instability due to d-wave pairing and stripe pattern of order-parameter distribution in two dimensions
National Laboratory of Solid State Microstructures and Department of Physics, Nanjing University - Nanjing 210093, PRC
Accepted: 4 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.
PACS: 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
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