| Zugriffsnummer | 15643 |
| Dokumenttyp | Zeitschriftenartikel |
| Sprache | Englisch |
| Titel | Single-hole dynamics in the t-J model |
| Autor(in); Institution |
Apel, Walter; Q.103, Elektronenkorrelation in Vielteilchensystemen, PTB-Braunschweig
Everts, H.-U.; Universität Hannover, Institut für Theoretische Physik, Hannover, GERMANY
Körner, U.; Universität Hannover, Institut für Theoretische Physik, Hannover, GERMANY
|
| Quelle/Jahr | Physical Review B: 66 (2002), 174423-1 - 174423-9 |
| ISSN | 0163-1829 |
| DOI | |
| Verlag | Melville, NY: AIP |
| Klassifikationscode | PACS: 75.10.Jm ; PACS: 71.10.Fd ; PACS: 71.10.Pm |
| Zusammenfassung | The quasiparticle weight of a single hole in an antiferromagnetic background is studied in the semiclassical approximation. We start from the t-J model, generalize it to arbitrary spin S by employing an appropriate coherent state representation for the hole, and derive an effective action for the dynamics in the long-wavelength low-energy limit. In the same limit, we find an expression for the single-hole Green's function which we evaluate in an 1/S expansion. Our approach has the advantage of being applicable in one and in two dimensions. We find two qualitatively different results in these two cases: while in one dimension our results are compatible with a vanishing quasiparticle weight, this weight is found to be finite in two dimensions, indicating normal quasiparticle behavior of the hole in this last case. |
