Magnetism and metal-insulator transitions in the Rashba-Hubbard model

Abstract

The nature of metal-insulator and magnetic transitions is still a subject under intense debate in condensed matter physics. Amongst the many possible mechanisms, the interplay between electronic correlations and spin-orbit couplings is an issue of a great deal of interest, in particular when dealing with quasi-2D compounds. In view of this, here we use a Hartree-Fock approach to investigate how the Rashba spin-orbit coupling, $V_{\text{SO}}$, affects the magnetic ordering provided by a Hubbard interaction, $U$, on a square lattice. At half-filling, we have found a sequence of transitions for increasing $V_{\text{SO}}$: from a Mott insulator to a metallic antiferromagnet, and then to a paramagnetic Rashba metal. Also, our results indicate that the Rashba coupling favors magnetic striped phases in the doped regime. By analyzing spectral properties, we associate the rearrangement of the magnetic ordering with the emerging chirality created by the spin-orbit coupling. Our findings provide insights towards clarifying the competition between these tendencies.

References in corpus (7)

• Many-Body Physics with Ultracold Gases
• Spin-orbit coupled fermions in an optical lattice clock
• Square Lattice Iridates
• Microscopic Theory of Rashba Interaction in Magnetic Metal
• Impact of spin-orbit coupling on the Holstein polaron
• A generalized Stoner criterion and versatile spin ordering in two-dimensional spin-orbit coupled electron systems
• Superconducting Kondo phase in an orbitally-separated bilayer

Cited by in corpus (1)

• Phase diagram of the square lattice Hubbard model with Rashba-type antisymmetric spin-orbit coupling