We show that, in the open Hubbard model with integrable boundary conditions, the bulk Yangian symmetry is broken to a twisted Yangian. We prove that the associated charges commute with the Hamiltonian and the reflection matrix, and that they form a coideal subalgebra.
Journal of Physics A Mathematical General
- Pub Date:
- August 2014
- High Energy Physics - Theory;
- Condensed Matter - Strongly Correlated Electrons;
- Mathematics - Quantum Algebra
- 13 pages. Minor revisions and additional references