We present a mean-field theoretical study on the effect of a single nonmagnetic impurity in quasi-one-dimensional unconventional density wave. The scattering potential is treated within the self-consistent T -matrix approximation. The local density of states around the impurity exhibits resonant states in the vicinity of the Fermi level, much the same way as in d density waves or unconventional superconductors. The assumption for different forward and backward scattering, characteristic to quasi-one-dimensional systems in general, leads to a resonance state that is double peaked in the pseudogap. The Friedel oscillations around the impurity are also explored, both within and beyond the density wave coherence length ξ0. Beyond ξ0, we find power-law behavior as opposed to the exponential decay of conventional density wave.
|Journal||Physical Review B - Condensed Matter and Materials Physics|
|Publication status||Published - May 10 2007|
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics