Universität zu Köln

Contessi, Daniele ORCID: 0000-0002-2610-8496, Romito, Donato ORCID: 0000-0001-6368-9675, Rizzi, Matteo ORCID: 0000-0002-8283-1005 and Recati, Alessio (2021). Collisionless drag for a one-dimensional two-component Bose-Hubbard model. Phys. Rev. Res., 3 (2). COLLEGE PK: AMER PHYSICAL SOC. ISSN 2643-1564

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Abstract

We theoretically investigate the elusive Andreev-Bashkin collisionless drag for a two-component one-dimensional Bose-Hubbard model on a ring. By means of tensor network algorithms, we calculate the superfluid stiffness matrix as a function of intra- and interspecies interactions and of the lattice filling. We then focus on the most promising region close to the so-called pair-superfluid phase, where we observe that the drag can become comparable with the total superfluid density. We elucidate the importance of the drag in determining the long-range behavior of the correlation functions and the spin speed of sound. In this way, we are able to provide an expression for the spin Luttinger parameter K-S in terms of drag and the spin susceptibility. Our results are promising in view of implementing the system by using ultracold Bose mixtures trapped in deep optical lattices, where the size of the sample is of the same order of the number of particles we simulate. Importantly, the mesoscopicity of the system, far from being detrimental, appears to favor a large drag, avoiding the Berezinskii-Kosterlitz-Thouless jump at the transition to the pair-superfluid phase which would reduce the region where a large drag can be observed.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Contessi, Daniele UNSPECIFIED orcid.org/0000-0002-2610-8496 UNSPECIFIED Romito, Donato UNSPECIFIED orcid.org/0000-0001-6368-9675 UNSPECIFIED Rizzi, Matteo UNSPECIFIED orcid.org/0000-0002-8283-1005 UNSPECIFIED Recati, Alessio UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-593115
DOI:	10.1103/PhysRevResearch.3.L022017
Journal or Publication Title:	Phys. Rev. Res.
Volume:	3
Number:	2
Date:	2021
Publisher:	AMER PHYSICAL SOC
Place of Publication:	COLLEGE PK
ISSN:	2643-1564
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language Physics, Multidisciplinary Multiple languages
URI:	http://kups.ub.uni-koeln.de/id/eprint/59311