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Unidirectional d-wave superconducting domains in the two-dimensional t-J model
Marcin Raczkowski, Manuela Capello, Didier Poilblanc, Raymond Fresard, Andrzej M. Oles
par - 9 août 2007
Using the t-J model at x=1/8 doping, we investigate the emergence of spontaneous modulations in the d-wave superconducting resonating valence bond phase which may be connected to the recently observed pattern of unidirectional domains found in scanning tunneling microscopy studies of high-T_c superconductors [Y. Kohsaka \it et al., Science \bf 315, 1380 (2007)]. Half-filled charge domains separated by four lattice spacings are found to form along one of the crystal axis leading to modulated superconductivity with \it out-of-phase d-wave order parameters in neighboring domains. Both renormalized mean-field theory and variational Monte Carlo calculations yield that the energies of modulated and uniform phases are very close to each other.