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

Derzhko O, Schnack J, Dmitriev DV, Krivnov VY, Richter J (2020)
European Physical Journal B 93(8): 161.

Zeitschriftenaufsatz | Veröffentlicht | Englisch
 
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Autor*in
Derzhko, Oleg; Schnack, JürgenUniBi ; Dmitriev, Dmitry V.; Krivnov, Valery Ya.; Richter, Johannes
Abstract / Bemerkung
We consider the strongly anisotropic spin-1/2XXZmodel on the sawtooth-chain lattice with ferromagnetic longitudinal interactionJ(zz)= Delta Jand aniferromagnetic transversal interactionJ(xx)=J(yy)=J> 0. At Delta = -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.
Stichworte
Solid State and Materials
Erscheinungsjahr
2020
Zeitschriftentitel
European Physical Journal B
Band
93
Ausgabe
8
Art.-Nr.
161
ISSN
1434-6028
eISSN
1434-6036
Page URI
https://pub.uni-bielefeld.de/record/2946133

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Derzhko O, Schnack J, Dmitriev DV, Krivnov VY, Richter J. Flat-band physics in the spin-1/2 sawtooth chain. European Physical Journal B. 2020;93(8): 161.
Derzhko, O., Schnack, J., Dmitriev, D. V., Krivnov, V. Y., & Richter, J. (2020). Flat-band physics in the spin-1/2 sawtooth chain. European Physical Journal B, 93(8), 161. doi:10.1140/epjb/e2020-10224-1
Derzhko, O., Schnack, J., Dmitriev, D. V., Krivnov, V. Y., and Richter, J. (2020). Flat-band physics in the spin-1/2 sawtooth chain. European Physical Journal B 93:161.
Derzhko, O., et al., 2020. Flat-band physics in the spin-1/2 sawtooth chain. European Physical Journal B, 93(8): 161.
O. Derzhko, et al., “Flat-band physics in the spin-1/2 sawtooth chain”, European Physical Journal B, vol. 93, 2020, : 161.
Derzhko, O., Schnack, J., Dmitriev, D.V., Krivnov, V.Y., Richter, J.: Flat-band physics in the spin-1/2 sawtooth chain. European Physical Journal B. 93, : 161 (2020).
Derzhko, Oleg, Schnack, Jürgen, Dmitriev, Dmitry V., Krivnov, Valery Ya., and Richter, Johannes. “Flat-band physics in the spin-1/2 sawtooth chain”. European Physical Journal B 93.8 (2020): 161.

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