Variational optimization with infinite projected entangled-pair states

Article

关键词: MATRIX RENORMALIZATION-GROUP;    QUANTUM ANTIFERROMAGNET SRCU2(BO3)(2);    GROUND-STATE;    SPIN SYSTEM;    PRODUCT STATES;    SUPERSTRUCTURE;    FORMULATION;    PLATEAU;   

DOI  :  10.1103/PhysRevB.94.035133

来源: SCIE

【 摘 要 】

We present a scheme to perform an iterative variational optimization with infinite projected entangled-pair states, a tensor network ansatz for a two-dimensional wave function in the thermodynamic limit, to compute the ground state of a local Hamiltonian. The method is based on a systematic summation of Hamiltonian contributions using the corner-transfer-matrix method. Benchmark results for challenging problems are presented, including the two-dimensional Heisenberg model, the Shastry-Sutherland model, and the t-J model, which show that the variational scheme yields considerably more accurate results than the previously best imaginary-time evolution algorithm, with a similar computational cost and with a faster convergence towards the ground state.

【 授权许可】

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