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quant-ph2011★ 42 cited
A matrix product state based algorithm for determining dispersion relations of quantum spin chains with periodic boundary conditions
Bogdan Pirvu, Jutho Haegeman, Frank Verstraete
We study a matrix product state (MPS) algorithm to approximate excited states of translationally invariant quantum spin systems with periodic boundary conditions. By means of a mom…
quant-ph2011★ 147 cited
Variational matrix product ansatz for dispersion relations
Jutho Haegeman, Bogdan Pirvu, David J. Weir +4
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…