Journal
PHYSICAL REVIEW B
Volume 85, Issue 10, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.85.100408
Keywords
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Funding
- Research Foundation Flanders
- FWF doctoral program Complex Quantum Systems [W1210]
- Science and Technology Facilities Council
- DFG [FOR 635, SFB 631]
- EU
- ERC
- FWF SFB
- Austrian Science Fund (FWF) [W1210] Funding Source: Austrian Science Fund (FWF)
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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 nontrivial 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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