Spin dynamics of the doped t-J model

Details Spin dynamics of the doped t-J model Spin dynamics of the doped t-J model

1994-08-19

arxiv.org/abs/cond-mat/9408057v1

Physics

Condensed Matter

Remarks: RevTex-file (3 PRB pages) + 6 figures attached as compressed postscript files

Scientific paper

We present a new method for studying the low energy excitations in finite cluster systems and apply it to clarify the nature of the low energy spin excitations in the moderately doped t-J model. We find that the character of the low energy spin excitations changes within the Brillouin zone, with the dominant excitation for momentum transfer (pi,pi) being a spin wave-like collective mode. Spin excitations with momentum transfer different from (pi,pi) have particle-hole character. We give an explicit construction of a low energy collective spin mode in a system with `almost broken symmetry' and demonstrate its validity by explicit numerical check.

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