Magnetism, transport, and thermodynamics in two-dimensional half-filled Hubbard superlattices

Article

关键词: ONE-DIMENSIONAL SUPERLATTICES;    OXIDE INTERFACES;    INSULATOR-TRANSITION;    MODEL;    SPIN;    STATE;    SUPERCONDUCTIVITY;    FERROMAGNETISM;    DENSITY;    SYSTEM;   

DOI  :  10.1103/PhysRevB.95.075142

来源: SCIE

【 摘 要 】

We study magnetic, transport, and thermodynamic properties of the half-filled two-dimensional (2D) Hubbard model with layered distributed repulsive interactions using unbiased finite temperature quantum Monte Carlo simulations. Antiferromagnetic long-ranged correlations at T = 0 are confirmed by means of the magnetic structure factor and the onset of short-ranged ones is at a minimum temperature, which can be obtained by peaks in susceptibility and specific heat following a random-phase-approximation (RPA) prediction. We also show that transport is affected in the large interaction limit and is enhanced in the nonrepulsive layers suggesting a change of dimensionality induced by increased interactions. Lastly, we show that by adiabatically switching the interactions in layered distributed patterns reduces the overall temperature of the system with a potential application in cooling protocols in cold atoms systems.

【 授权许可】

Free