Simulating excitation spectra with projected entangled-pair states
作者： Laurens Vanderstraeten , Jutho Haegeman , Frank Verstraete
DOI: 10.1103/PHYSREVB.99.165121
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摘要: We develop and benchmark a technique for simulating excitation spectra of generic two-dimensional quantum lattice systems using the framework projected entangled-pair states (PEPS). The relies on variational ansatz capturing quasiparticle excitations top PEPS ground state. Our method perfectly captures dispersion relation square-lattice transverse-field Ising model reproduces spin-wave velocity anomaly in Heisenberg with high precision.
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