Fidelity and quantum phase transition for the Heisenberg chain with next-nearest-neighbor interaction
Fidelity and quantum phase transition for the Heisenberg chain with next-nearest-neighbor interaction
In this paper, we investigate the fidelity for the Heisenberg chain with the next-nearest-neighbor interaction (or the J1-J2 model) and analyze its connections with quantum phase transition. We compute the fidelity between the ground states and find that the phase transition point of the J1-J2 model cannot be well characterized …