Abstract
We attempt to access the regime of strong coupling between charge carriers and transverse dynamics of an isolated conducting “stripe,” such as those found in cuprate superconductors. A stripe is modeled as a partially doped domain wall in an antiferromagnet introduced in the context of two different models: the model with strong Ising anisotropy, and the Hubbard model in the Hartree-Fock approximation. The domain walls with a given linear charge density are supported artificially by boundary conditions. In both models we find a regime of parameters where doped holes lose their spin and become holons (charge spin which can move along the stripe without frustrating AF environment. One aspect in which the holons on the AF domain wall differ from those in an ordinary one-dimensional electron gas is their transverse degree of freedom: a mobile holon always resides on a transverse kink (or antikink) of the domain wall. This gives rise to two holon flavors and to a strong coupling between doped charges and transverse fluctuations of a stripe.
- Received 2 August 1999
DOI:https://doi.org/10.1103/PhysRevB.61.12503
©2000 American Physical Society