Related papers: Molecular quantum phase transistor

The paper has been withdrawn by the author.

This paper has been withdrawn due to non-clearness of some technical points, as well as lack of a reasonable statement of quantization conjecture.

This paper has been withdrawn by the author because there are some typos in proofs.

This paper has been withdrawn by the authors due to substantial changes.

This paper has been withdrawn by the authors.

This paper was withdrawn by the authors.

This paper has been withdrawn by the author due to errors.

This paper has been withdrawn by the author.

The paper has bene withdrawn by the author.

This paper has been withdrawn because the first author submitted the paper without previously consulting the rest of the authors.

The paper is withdrawn by the author because it is superseded by cond-mat/0303357 .

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This paper has been withdrawn by the author because in the main text some discussion parts were inadvertently added by mistake.

This paper has been withdrawn by the author due to a crucial error in the submission action.

This paper has been withdrawn by the author(s), due a crucial sign error in conclusion .

This paper was withdrawn by the author.

This paper has been withdrawn by the authors, due to the discovery of paper 0201028 which predates it and contains most of it's results.

The paper has been withdrawn.

This paper has been withdrawn by the authors due to some fatal errors in the analysis.

This paper has been withdrawn by the authors because the authors excluded the paper from electronic proceedings of the conference.