Bloch Walls and Macroscopic String States in Bethe's Solution of the Heisenberg Ferromagnetic Linear Chain

Abhishek Dhar; B. Sriram Shastry

doi:10.1103/PhysRevLett.85.2813

Bloch Walls and Macroscopic String States in Bethe's Solution of the Heisenberg Ferromagnetic Linear Chain

Abhishek Dhar and B. Sriram Shastry

Phys. Rev. Lett. 85, 2813 – Published 25 September 2000

Abstract

We present a calculation of the lowest excited states of the Heisenberg ferromagnet in 1D for any wave vector. These turn out to be string solutions of Bethe's equations with a macroscopic number of particles in them. They are identified as generalized quantum Bloch wall states, and a simple physical picture is provided for the same.

Received 9 March 2000

DOI:https://doi.org/10.1103/PhysRevLett.85.2813

Authors & Affiliations

Abhishek Dhar^1,* and B. Sriram Shastry^2,†

¹Theoretical Physics Group, Raman Research Institute, Bangalore 560080, India
²Department of Physics, Indian Institute of Science, Bangalore 560012, India

^*Also at the Poornaprajna Institute, Bangalore, India.Electronic address: dabhi@rri.ernet.in
^†Also at the JNCASR, Bangalore, India.Electronic address: bss@physics.iisc.ernet.in