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85034474960
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private communications
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After the completion of this work we learned that a similar result was independently obtained by; H. Tsuchiura, Y. Tanaka, M. Ogata and S. Kashiwaya, private communications.
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Tsuchiura, H.1
Tanaka, Y.2
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Kashiwaya, S.4
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19
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0040436013
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For numerical diagonalization of matrices we have used the computer program written by H. Nishimori; TITPACK version2.
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TITPACK Version2
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Nishimori, H.1
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20
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85034474024
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note
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For a smaller doping rate the coherence length becomes shorter, and the effect of the impurity is well localized within the finite system considered here. The fact that the qualitative results do not depend on the doping rate implies that the finite-size effect is negligible.
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22
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0040843486
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A. Himeda, M. Ogata, Y. Tanaka and S. Kashiwaya, J. Phys. Soc. Jpn. 66, 3367 (1997). In this paper the splitting of the zero-energy peak in the vortex core is found, and it was attributed to the T-violation. However this T-violation is not spontaneous, since T is explicitly broken by an external magnetic field.
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0030529759
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Y. Ohashi and S. Takada, J. Phys. Soc. Jpn. 65, 246 (1996). In this paper it was demonstrated that for T-invariant states a zero-energy bound state should appear at the impurity. Since this result was obtained in the continuum approximation the effect of staggered charge modulation was not included.
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0030542929
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Y. Onishi, Y. Ohashi, Y. Shingaki and K. Miyake, J. Phys. Soc. Jpn. 65, 675 (1996). In this paper the effect of nonmagnetic impurities in the d-wave superconducting state of the attractive Hubbard model is studied, but the splitting of the zero-energy state for the case of single impurity was not found. Since the detailed informations such as the electron density distribution or the doping rate is not provided, it is difficult to judge what is the cause of the difference with our finding.
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Onishi, Y.1
Ohashi, Y.2
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Miyake, K.4
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