Universität zu Köln

Haller, Andreas, Rizzi, Matteo ORCID: 0000-0002-8283-1005 and Filippone, Michele ORCID: 0000-0003-1102-8335 (2020). Drude weight increase by orbital and repulsive interactions in fermionic ladders. Phys. Rev. Res., 2 (2). COLLEGE PK: AMER PHYSICAL SOC. ISSN 2643-1564

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Abstract

In strictly one-dimensional systems, repulsive interactions tend to reduce particle mobility on a lattice. Therefore, the Drude weight, controlling the divergence at zero-frequency of optical conductivities in perfect conductors, is lower than in noninteracting cases. We show that this is not the case when extending to quasi-one-dimensional ladder systems. Relying on bosonization, perturbative and matrix product states (MPS) calculations, we show that nearest-neighbor interactions and magnetic fluxes provide a bias between back- and forward-scattering processes, leading to linear corrections to the Drude weight in the interaction strength. As a consequence, Drude weights counterintuitively increase (decrease) with repulsive (attractive) interactions. Our findings are relevant for the efficient tuning of Drude weights in the framework of ultracold atoms trapped in optical lattices and equally affect topological edge states in condensed matter systems.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Haller, Andreas UNSPECIFIED UNSPECIFIED UNSPECIFIED Rizzi, Matteo UNSPECIFIED orcid.org/0000-0002-8283-1005 UNSPECIFIED Filippone, Michele UNSPECIFIED orcid.org/0000-0003-1102-8335 UNSPECIFIED
URN:	urn:nbn:de:hbz:38-336686
DOI:	10.1103/PhysRevResearch.2.023058
Journal or Publication Title:	Phys. Rev. Res.
Volume:	2
Number:	2
Date:	2020
Publisher:	AMER PHYSICAL SOC
Place of Publication:	COLLEGE PK
ISSN:	2643-1564
Language:	English
Faculty:	Faculty of Mathematics and Natural Sciences
Divisions:	Faculty of Mathematics and Natural Sciences > Department of Physics > Institute for Theoretical Physics
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language PERSISTENT CURRENTS; LUTTINGER-LIQUID; MESOSCOPIC RINGS; EIGENVALUE CURVATURES; SPIN-DIFFUSION; CONDUCTIVITY; TRANSPORT; CONDUCTANCE; CHAIN; RENORMALIZATION Multiple languages Physics, Multidisciplinary Multiple languages
Refereed:	Yes
URI:	http://kups.ub.uni-koeln.de/id/eprint/33668