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arXiv · 1903.12374

Glassy properties of the Bose-glass phase of a one-dimensional disordered Bose fluid

Nicolas Dupuis
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Abstract

We study a one-dimensional disordered Bose fluid using bosonization, the replica method and a nonperturbative functional renormalization-group approach. The Bose-glass phase is described by a fully attractive strong-disorder fixed point characterized by a singular disorder correlator whose functional dependence assumes a cuspy form that is related to the existence of metastable states. At nonzero momentum scale, quantum tunneling between these metastable states leads to a rounding of the nonanalyticity in a quantum boundary layer that encodes the existence of rare superfluid regions responsible for the $\omega^2$ behavior of the (dissipative) conductivity in the low-frequency limit. These results can be understood within the "droplet" picture put forward for the description of glassy (classical) systems.

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Nicolas Dupuis. 2019-03-29. Glassy properties of the Bose-glass phase of a one-dimensional disordered Bose fluid. https://doi.org/10.1103/physreve.100.030102

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