Abstract
Some rigorous results are presented for a first-order quantum phase transition between the dimerized state and Haldane-type state (i.e., a state similar to the ground state of the one-dimensional spin-1 Heisenberg chain) in the spin-1/2 coupled chains with nearest-neighbor and next-nearest-neighbor Heisenberg interactions. Also presented is a class of exact excited states in both phases. A partial phase diagram of the general spin-1/2 coupled chains is discussed.
| Original language | English |
|---|---|
| Pages (from-to) | 12485-12488 |
| Number of pages | 4 |
| Journal | Physical Review B: covering condensed matter and materials physics |
| Volume | 52 |
| Issue number | 17 |
| Publication status | Published - 1995 |