Spectral function of transverse spin fluctuations in an antiferromagnet
| dc.creator | Singh, Avinash | |
| dc.date | 2000-06-06 | |
| dc.date.accessioned | 2026-07-07T02:37:49Z | |
| dc.date.available | 2026-07-07T02:37:49Z | |
| dc.description | The spectral function of transverse spin fluctuations, including the contributions from both the single-particle and the collective (magnon) excitations in an antiferromagnet, is evaluated for the Hubbard model with NN and NNN hoppings in the full U-range from weak coupling to strong coupling. For the NN hopping model, the magnon excitations are dominant for U > 2.5 (d=2), so that an effective spin description of the AF state holds down to a surprisingly low U value. In the weak coupling limit the spectral function is suppressed at low energies, as if due to an effective gap. NNN hopping t' leads to magnon softening and also a significant increase in the low-energy spectral function due to single-particle excitations. Evolution of the magnon spectrum with t' is studied in the strong coupling limit, and the quantum spin- fluctuation correction to sublattice magnetization in d=2 and the Neel temperature in d=3 are also evaluated. | |
| dc.description | 9 pages, 10 figures | |
| dc.identifier | https://arxiv.org/abs/cond-mat/0006079 | |
| dc.identifier | http://arxiv.org/abs/cond-mat/0006079 | |
| dc.identifier.uri | http://salesiana.dossiersoluciones.com/handle/123456789/16441 | |
| dc.subject | Strongly Correlated Electrons | |
| dc.title | Spectral function of transverse spin fluctuations in an antiferromagnet | |
| dc.type | text |