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Effective action approach and Carlson-Goldman mode in d-wave superconductors | | Sergei G. Sharapov
; Hans Beck
; | | Date: |
3 Sep 2001 | | Journal: | Phys.Rev. B65 (2002) 134516 | | Subject: | Superconductivity | cond-mat.supr-con hep-ph | | Abstract: | We theoretically investigate the Carlson-Goldman (CG) mode in two-dimensional clean d-wave superconductors using the effective ``phase only’’ action formalism. In conventional s-wave superconductors, it is known that the CG mode is observed as a peak in the structure factor of the pair susceptibility $S(Omega, mathbf{K})$ only just below the transition temperature T_c and only in dirty systems. On the other hand, our analytical results support the statement by Y.Ohashi and S.Takada, Phys.Rev.B {f 62}, 5971 (2000) that in d-wave superconductors the CG mode can exist in clean systems down to the much lower temperatures, $T approx 0.1 T_c$. We also consider the manifestations of the CG mode in the density-density and current-current correlators and discuss the gauge independence of the obtained results. | | Source: | arXiv, cond-mat/0109004 | | Services: | Forum | Review | PDF | Favorites | |
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