期刊论文详细信息
SYSTEMATIC 1/S STUDY OF THE 2-DIMENSIONAL HUBBARD-MODEL AT HALF-FILLING | |
Article | |
关键词: QUANTUM HEISENBERG-ANTIFERROMAGNET; HIGH-TEMPERATURE SUPERCONDUCTIVITY; SQUARE-LATTICE; SPIN FLUCTUATIONS; SINGLE HOLE; EXCITATIONS; MOTION; INSTABILITIES; | |
DOI : 10.1103/PhysRevB.50.6238 | |
来源: SCIE |
【 摘 要 】
The two-dimensional Hubbard model is extended by placing 2S orbitals at each lattice site and studied in a systematic 1/S expansion. The 1/S results for the magnetic susceptibilitity and the spectra of spin-wave excitations at half-filling are consistent with the large S calculations for the Heisenberg antiferromagnet. The 1/S corrections to the fermionic spectrum lift the degeneracy along the edge of the magnetic Brillouin zone yielding minima at (+/- pi/2, +/- pi/2). Relation to previous papers on the subject is discussed.
【 授权许可】
Free