Simulating excitation spectra with projected entangled-pair states

Article

关键词: MATRIX PRODUCT STATES;    HEISENBERG-ANTIFERROMAGNET;    RENORMALIZATION-GROUP;    MAGNON DISPERSION;    ANYONS;   

DOI  :  10.1103/PhysRevB.99.165121

来源: SCIE

【 摘 要 】

We develop and benchmark a technique for simulating excitation spectra of generic two-dimensional quantum lattice systems using the framework of projected entangled-pair states (PEPS). The technique relies on a variational ansatz for capturing quasiparticle excitations on top of a PEPS ground state. Our method perfectly captures the quasiparticle dispersion relation of the square-lattice transverse-field Ising model and reproduces the spin-wave velocity and the spin-wave anomaly in the square-lattice Heisenberg model with high precision.

【 授权许可】

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