Propagation and jamming dynamics in Heisenberg spin ladders

Carlo B. Krimphoff, Masudul Haque, and Andreas M. Läuchli
Phys. Rev. B 95, 144308 – Published 19 April 2017

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.

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  • Received 12 January 2017
  • Revised 23 March 2017

DOI:https://doi.org/10.1103/PhysRevB.95.144308

©2017 American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

Carlo B. Krimphoff1, Masudul Haque2,3, and Andreas M. Läuchli1

  • 1Institut für Theoretische Physik, Leopold-Franzens Universität Innsbruck, A-6020 Innsbruck, Austria
  • 2Max-Planck-Institut für Physik komplexer Systeme, 01187 Dresden, Germany
  • 3Department of Mathematical Physics, National University of Ireland, Maynooth, Ireland

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Issue

Vol. 95, Iss. 14 — 1 April 2017

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