Hubbard pair cluster in the external fields. Studies of the chemical potential

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• 作者：T. Balcerzak ^{t_balcerzak@uni.lodz.pl} ; K. Szałowski ; ^{kszalowski@uni.lodz.pl}
• 关键词：Hubbard model ; Dimer ; Pair cluster ; Chemical potential ; Exact diagonalization ; Grand canonical ensemble
• 刊名：Physica A: Statistical Mechanics and its Applications
• 出版年：2017
• 出版时间：15 February 2017
• 年：2017
• 卷：468
• 期：Complete
• 页码：252-266
• 全文大小：666 K
• 卷排序：468

文摘

Hubbard model for dimer (pair cluster) is discussed. The presence of external electric and magnetic field is assumed. Exact diagonalization method is applied within grand canonical ensemble. Chemical potential is studied vs. electron number, external fields and temperature. The discontinuous behaviour of chemical potential is found at low temperatures.