Frustration-Driven Quantum Phase Transition in the 1D Extended Anisotropic Heisenberg Model

E. Plekhanov, A. Avella and F. Mancini Dipartimento di Fisica "E.R. Caianiello" - Unità CNISM di Salerno, Università degli Studi di Salerno, 84081 Baronissi (SA), Italy

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Received: 9 07 2007;

By using density matrix renormalization group technique we study the 1D extended anisotropic Heisenberg model. We find that starting from the ferromagnetic phase, the system undergoes two quantum phase transitions induced by frustration. By increasing the next-nearest-neighbor interaction, the ground state of the system changes smoothly from a completely polarized state to a next-nearest-neighbor correlated one. On the contrary, letting the in-plane interaction to be greater than the out-of-plane one, the ground state changes abruptly.

DOI: 10.12693/APhysPolA.113.429 PACS numbers: 75.10.Jm, 75.30.Kz, 75.10.Pq, 75.40.Mg