Krimphoff, Carlo B. and Haque, Masudul and Läuchli, Andreas M. (2017) Propagation and jamming dynamics in Heisenberg spin ladders. Physical Review B, 95 (144308). ISSN 1098-0121

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Abstract

We investigate the propagation dynamics of initially localized excitations in spin-12 Heisenberg ladders. We consider initial states with two overturned spins, either on neighboring sites on the same leg or on the two sites of a single rung, in an otherwise polarized (ferromagnetic) background. Compared to the corresponding dynamics in a chain (single leg), we observe several additional modes of propagation. We connect these propagation modes to features of the spectrum of the ladder system, and to different effective models corresponding to different segments of the spectrum. In addition to the regular propagation modes, we observe for one mode a peculiar “jamming” dynamics where components of the excitations remain localized in an unusual manner. A comparison with the spin-1 bilinear-biquadratic chain is developed and explored, where a similar phenomenon is shown to occur.

Item Type:	Article
Keywords:	Propagation; jamming dynamics; Heisenberg spin ladders;
Academic Unit:	Faculty of Science and Engineering > Mathematical Physics
Item ID:	10571
Identification Number:	https://doi.org/10.1103/PhysRevB.95.144308
Depositing User:	Masud Haque
Date Deposited:	22 Feb 2019 15:03
Journal or Publication Title:	Physical Review B
Publisher:	American Physical Society
Refereed:	Yes
URI:	https://journals.aps.org/prb
Use Licence:	This item is available under a Creative Commons Attribution Non Commercial Share Alike Licence (CC BY-NC-SA). Details of this licence are available here

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