Magnetic and lattice polaron in the Holstein t-J model

Article

关键词: HIGH-TEMPERATURE SUPERCONDUCTORS;    MEAN-FIELD THEORY;    SINGLE-HOLE;    QUANTUM ANTIFERROMAGNET;    CORRELATED ELECTRONS;    HIGH DIMENSIONS;    SQUARE LATTICE;    SPIN POLARONS;    SYSTEMS;    EXCITATIONS;   

DOI  :  10.1103/PhysRevB.66.165102

来源: SCIE

【 摘 要 】

We investigate the interplay between the formation of a lattice and magnetic polaron in the case of a single hole in the antiferromagnetic background. We present an exact analytical solution of the Holstein t-J model in infinite dimensions. The ground-state energy, electron-lattice correlation function, spin bag dimension as well as spectral properties are calculated. The magnetic and hole-lattice correlations sustain each other, i.e., the presence of antiferromagnetic correlations favors the formation of the lattice polaron at lower values of the electron-phonon coupling while the polaronic effect contributes to reduce the number of spin defects in the antiferromagnetic background. The crossover towards a spin-lattice small polaron region of the phase diagram becomes a discontinuous transition in the adiabatic limit.

【 授权许可】

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