Abstract
The ground-state energy and the singlet-triplet energy gap of the antiferromagnetic Heisenberg model on a ladder is investigated using a mean-field theory and the density-matrix renormalization group. Spin-wave theory shows that the corrections to the local magnetization are infinite. This indicates that no long-range order occurs in this system. A flux-phase state is used to calculate the energy gap as a function of the transverse coupling, J, in the ladder. It is found that the gap is linear in J for J1 and goes to zero for J→0. The mean-field theory agrees well with the numerical results.
| Original language | English |
|---|---|
| Pages (from-to) | 6233-6237 |
| Number of pages | 5 |
| Journal | Physical Review B |
| Volume | 50 |
| Issue number | 9 |
| DOIs | |
| State | Published - 1 Jan 1994 |
| Externally published | Yes |
ASJC Scopus subject areas
- Condensed Matter Physics
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