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Fractional spin excitations and conductance in the spiral-staircase Heisenberg ladder
JournalArticle (Originalarbeit in einer wissenschaftlichen Zeitschrift)
 
ID 4657252
Author(s) Ronetti, Flavio; Loss, Daniel; Klinovaja, Jelena
Author(s) at UniBasel Klinovaja, Jelena
Loss, Daniel
Year 2022
Title Fractional spin excitations and conductance in the spiral-staircase Heisenberg ladder
Journal Physical review B: Condensed matter and materials physics
Volume 105
Number 13
Pages / Article-Number 134413
Abstract We investigate theoretically the spiral-staircase Heisenberg spin-1/2 ladder in the presence of antiferromagnetic long-range spin interactions and a uniform magnetic field. As a special case we also consider the Kondo necklace model. If the magnetizations of the two chains forming the ladder satisfy a certain resonance condition, involving interchain couplings as perturbations, the system is in a partially gapped magnetic phase hosting excitations characterized by fractional spins, whose values can be changed by the magnetic field. We show that these fractional spin excitations can be probed via the magnetization and by spin currents in a transport setup with a spin conductance that reveals the fractionalized spin. In some special cases, the spin conductance reaches universal values. We obtain our results analytically via bosonization techniques as well as numerically via density matrix renormalization group methods and find remarkable agreement between the two approaches.
Publisher American Physical Society
ISSN/ISBN 1098-0121 ; 1550-235X
edoc-URL https://edoc.unibas.ch/92116/
Full Text on edoc Available
Digital Object Identifier DOI 10.1103/PhysRevB.105.134413
ISI-Number WOS:000800754300004
Document type (ISI) Article
 
   

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