2 papers
math-ph2019
Lie-Schwinger block-diagonalization and gapped quantum chains: analyticity of the ground-state energy
S. Del Vecchio, J. Fröhlich, A. Pizzo +1
We consider quantum chains whose Hamiltonians are perturbations by interactions of short range of a Hamiltonian that does not couple the degrees of freedom located at different sit…
math-ph2019
Lie-Schwinger block-diagonalization and gapped quantum chains with unbounded interactions
S. Del Vecchio, J. Fröhlich, A. Pizzo +1
We study quantum chains whose Hamiltonians are perturbations by interactions of short range of a Hamiltonian that does not couple the degrees of freedom located at different sites…