Dynamics of Holes in Antiferromagnetic State

概要

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Dynamics of holes in the antiferromagnetic state on the square lattice is studied.The dispersion curves, density of states and eigenfunctions of holes are calculated byusing the t-J and t-t'-J models. It is found that the hole moves in the antiferromagnetic state being accompanied by spin distortion around it. The dispersioncurves consist of almost continuous band and the low energy band splitting from it.The low energy band is caused by a motion of holes mediated by the quantum spinfluctuations and is rather sensitive to the sign and magnitude of the second nearneighbor hopping integral t'. The spectra of the optical conductivity and the Ramanscattering due to two spin excitations around holes are calculated and compared withthe experimental results. It is shown that spectra in the mid-infrared region appear inboth the optical conductivity and Raman scattering.
社団法人日本物理学会の論文
1990-06-15