Exact treatment of magnetism-driven ferroelectricity in the one-dimensional compass model
Exact treatment of magnetism-driven ferroelectricity in the one-dimensional compass model
We consider a class of one-dimensional compass models with antisymmetric Dzyaloshinskii-Moriya exchange interaction in an external magnetic field. Based on the exact solution derived by means of Jordan-Wigner transformation, we study the excitation gap, spin correlations, ground-state degeneracy, and critical properties at phase transitions. The phase diagram at finite electric …