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Open AccessArticle

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

Department of Applied Science and Technology and u.d.r. CNISM, Politecnico di Torino, I-10129 Torino, Italy
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Condens. Matter 2020, 5(1), 2; https://doi.org/10.3390/condmat5010002
Received: 10 December 2019 / Revised: 3 January 2020 / Accepted: 4 January 2020 / Published: 8 January 2020
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 of a mixture confined in a ring trimer and to resemble the mechanism of the superfluid-Mott insulator transition strongly. 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.
Keywords: Bose-Bose mixtures; mixing; localization; superfluid-Mott transition; quantum phase transitions; entanglement Bose-Bose mixtures; mixing; localization; superfluid-Mott transition; quantum phase transitions; entanglement
MDPI and ACS Style

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

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