Quantum phase transition in coupled spin ladders

Article

关键词: 2-DIMENSIONAL HEISENBERG-MODEL;    FUNCTION MONTE-CARLO;    ANTIFERROMAGNETS;    STATE;    SPECTRUM;    SYSTEMS;    LATTICE;    LIQUID;    ORDER;    BOND;   

DOI  :  10.1103/PhysRevB.65.092406

来源: SCIE

【 摘 要 】

The ground state of an array of coupled, spin-1/2 antiferromagnetic ladders is studied using spin-wave theory, exact diagonalization (up to 36 sites), and quantum Monte Carlo techniques (up to 256 sites). Our results clearly indicate the occurrence of a zero-temperature phase transition between a Neel ordered and a nonmagnetic phase at a finite value of the interladder coupling (a(c)similar or equal to0.3). This transition is marked by remarkable changes in the structure of the excitation spectrum.

【 授权许可】

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