Flat-band physics in the spin-1/2 sawtooth chain

Oleg Derzhko (), Jürgen Schnack, Dmitry V. Dmitriev, Valery Ya. Krivnov and Johannes Richter
Additional contact information
Oleg Derzhko: Institute for Condensed Matter Physics, National Academy of Sciences of Ukraine
Jürgen Schnack: Fakultät für Physik, Universität Bielefeld
Dmitry V. Dmitriev: Institute of Biochemical Physics of RAS
Valery Ya. Krivnov: Institute of Biochemical Physics of RAS
Johannes Richter: Max-Planck-Institut für Physik komplexer Systeme

The European Physical Journal B: Condensed Matter and Complex Systems, 2020, vol. 93, issue 8, 1-12

Abstract: Abstract We consider the strongly anisotropic spin-1/2 XXZ model on the sawtooth-chain lattice with ferromagnetic longitudinal interaction Jzz = ΔJ and aniferromagnetic transversal interaction Jxx = Jyy = J > 0. At Δ = −1∕2 the lowest one-magnon excitation band is dispersionless (flat) leading to a massively degenerate set of ground states. Interestingly, this model admits a three-coloring representation of the ground-state manifold [H.J. Changlani et al., Phys. Rev. Lett. 120, 117202 (2018)]. We characterize this ground-state manifold and elaborate the low-temperature thermodynamics of the system. We illustrate the manifestation of the flat-band physics of the anisotropic model by comparison with two isotropic flat-band Heisenberg sawtooth chains. Our analytical consideration is complemented by exact diagonalization and finite-temperature Lanczos method calculations. Graphical abstract

Keywords: Solid; State; and; Materials (search for similar items in EconPapers)
Date: 2020
References: Add references at CitEc
Citations:

Downloads: (external link)
http://link.springer.com/10.1140/epjb/e2020-10224-1 Abstract (text/html)
Access to the full text of the articles in this series is restricted.

Related works:
This item may be available elsewhere in EconPapers: Search for items with the same title.

Export reference: BibTeX RIS (EndNote, ProCite, RefMan) HTML/Text

Persistent link: https://EconPapers.repec.org/RePEc:spr:eurphb:v:93:y:2020:i:8:d:10.1140_epjb_e2020-10224-1

Ordering information: This journal article can be ordered from
http://www.springer.com/economics/journal/10051

DOI: 10.1140/epjb/e2020-10224-1

Access Statistics for this article

The European Physical Journal B: Condensed Matter and Complex Systems is currently edited by P. Hänggi and Angel Rubio

More articles in The European Physical Journal B: Condensed Matter and Complex Systems from Springer, EDP Sciences
Bibliographic data for series maintained by Sonal Shukla () and Springer Nature Abstracting and Indexing ().