Working Paper Article Version 1 This version is not peer-reviewed

Quantum-Granularity Effect in the Formation of Supermixed Solitons in Ring Lattices

Version 1 : Received: 10 December 2019 / Approved: 12 December 2019 / Online: 12 December 2019 (05:39:48 CET)

A peer-reviewed article of this Preprint also exists.

Richaud, A.; Penna, V. Quantum-Granularity Effect in the Formation of Supermixed Solitons in Ring Lattices. Condens. Matter 2020, 5, 2. Richaud, A.; Penna, V. Quantum-Granularity Effect in the Formation of Supermixed Solitons in Ring Lattices. Condens. Matter 2020, 5, 2.

Journal reference: Condens. Matter 2020, 5, 2
DOI: 10.3390/condmat5010002

Abstract

We investigate a notable class of states peculiar to a bosonic binary mixture featuring repulsive intraspecies and attractive interspecies couplings. We evidence that, for small values of the hopping amplitudes, one can access particular regimes marked by the fact that the interwell boson transfer occurs in a jerky fashion. This property is shown to be responsible for the emergence of a staircase-like structure in the phase diagram and to strongly resemble the mechanism of the superfluid-Mott insulator transition. Under certain conditions, in fact, we show that it is possible to interpret the interspecies attraction as an effective chemical potential and the supermixed soliton as an effective particle reservoir. Our investigation is developed both within a fully quantum approach based on the analysis of several quantum indicators and by means of a simple analytical approximation scheme capable of capturing the essential features of this ultraquantum effect.

Subject Areas

bose-bose mixtures; mixing; localization; superfluid-mott transition; quatum phase transitions; entanglement

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