most citedProving the existence of bound states for attractive potentials in 1-d and 2-d without calculus

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cond-mat.str-el2021

Nonequilibrium spectral moment sum rules of the Holstein-Hubbard model

Khadijeh Najafi, J. Alexander Jacoby, R. D. Nesselrodt +1

We derive a general procedure for evaluating the th derivative of a time-dependent operator in the Heisenberg representation and employ this approach to calculate the zero…