Physics – Condensed Matter – Superconductivity
Scientific paper
2010-01-19
Physics Letters A 374, 3084 (2010)
Physics
Condensed Matter
Superconductivity
8 pages, 5 figures, added discussions and references, accepted for publication in Phys. Lett. A
Scientific paper
10.1016/j.physleta.2010.05.042
The quasiparticle scattering interference phenomenon characterized by the peaks in the local density of states is studied within the kinetic energy driven superconducting mechanism in the presence of a single impurity. By calculation of the Fourier transformed ratio of the local density of states at opposite energy, it is shown that the quasiparticle scattering interference phenomenon can be described qualitatively by a single impurity in the kinetic energy driven homogeneous d-wave superconducting state. The amplitude of the peak increases with increasing energy at the low energy, and reaches a maximum at the intermediate energy, then diminishes to zero at the high energy. The theory also predicts that with increasing doping, the position of the peak along the nodal direction moves towards to the center of the Brillouin zone, while the position of the peak along the antinodal direction is shifted to large momentum region.
Feng Shiping
Liu Bin
Wang Zhi
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