Variational matrix product ansatz for dispersion relations

Details Variational matrix product ansatz for dispersion relations Variational matrix product ansatz for dispersion relations

2011-03-11

arxiv.org/abs/1103.2286v3

Phys. Rev. B 85, 100408(R) (2012)

Physics

Quantum Physics

Published version

Scientific paper

10.1103/PhysRevB.85.100408

A variational ansatz for momentum eigenstates of translation invariant quantum spin chains is formulated. The matrix product state ansatz works directly in the thermodynamic limit and allows for an efficient implementation (cubic scaling in the bond dimension) of the variational principle. Unlike previous approaches, the ansatz includes topologically non-trivial states (kinks, domain walls) for systems with symmetry breaking. The method is benchmarked using the spin-1/2 XXZ antiferromagnet and the spin-1 Heisenberg antiferromagnet and we obtain surprisingly accurate results.

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