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Inhomogeneous mean-field approach to collective excitations near the superfluid–Mott glass transition

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Puschmann, Martin ; Getelina, João C. ; Hoyos, José A. ; Vojta, Thomas

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Date of publication of this fulltext: 21 Jun 2021 16:42


We develop an inhomogeneous quantum mean-field approach to the behavior of collective excitations across the superfluid–Mott glass quantum phase transition in two dimensions, complementing recent quantum Monte Carlo simulations (Puschmann et al. 2020). In quadratic (Gaussian) approximation, the Goldstone (phase) and Higgs (amplitude) modes completely decouple. Each is described by a disordered ...


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