期刊
PHYSICAL REVIEW B
卷 99, 期 16, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.99.165121
关键词
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资金
- Research Foundation Flanders
- ERC [647905, 715861]
- EU Grant SIQS
- European Research Council (ERC) [715861, 647905] Funding Source: European Research Council (ERC)
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.
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