Single-particle excitation spectrum of the Hubbard model with magnetic frustration at finite temperature

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• 作者：Changfeng ; Chen ; Jianzhong ; Zheng
• 刊名：Physics Letters A
• 出版年：1997
• 出版时间：January 6, 1997
• 年：1997
• 卷：224
• 期：3
• 页码：169-175
• 全文大小：513 K

文摘

The single-particle excitation spectrum of the Hubbard model with magnetic frustration at finite temperature is examined using numerical exact diagonalization techniques. The magnetic frustration is introduced by a proper choice of the Hamiltonian parameters, which lead to rich low-energy spin excitation behavior, resembling those observed in heavy fermion systems. At finite temperature, the low-lying excited states become thermally populated with significant weight. As a result, the calculated spectrum shows interesting temperature dependent evolution. The calculated results are presented and discussed in a many-body picture to gain insight into the photoelectron spectroscopy of strongly correlated electron systems.