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journal id: "physicalxreviewxletters"
| Authors | M.J. Martins, B. Nienhuis | | Title | Exact and numerical results for a dimerized coupled spin-1/2 chain |
| Journal | Physical Review Letters |
| Volume | 85 |
| Year | 2000 |
| Issue | 23 |
| Pages | 4956-4959 |
| ISSN | 00319007 |
| Faculty | Faculty of Science |
| Institute/dept. | FNWI: Institute for Theoretical Physics (ITF) |
| Keywords | - |
| Abstract | We establish exact results for coupled spin-1/2 chains for special values of the four-spin interaction V and dimerization parameter delta. The first exact result is at delta = 1/2 and V = -2. Because we find a very small but finite gap in this dimerized chain, this can serve as a very strong test case for numerical and approximate analytical techniques. The second result is for the homogeneous chain with V = -4 and gives evidence that the system has a spontaneously dimerized ground state. Numerical diagonalization and bosonization techniques indicate that the interplay between dimerization and interaction could result in gapless phases in the regime 0 less than or equal to V < -2. |
| Document type | Article |
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