期刊
RESULTS IN PHYSICS
卷 34, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.rinp.2022.105250
关键词
Extended Hubbard model; Four-body interaction; Phase diagram; Weak coupling
资金
- Natural Science Foundation of Xinjiang Uygur Autonomous Region of China [2020D01C042]
- National Natural Science Foundation of China [12064043, 11864039]
In this study, we analytically investigate the phase diagram of a one-dimensional half-filled extended Hubbard model with nearest neighboring four-electron interaction in the weak-coupling regime. Our results show that the additional four-electron coupling splits independent Gaussian and spin-gap transitions and also leads to the charge-gap transition.
In the weak-coupling regime, we analytically investigate phase diagram of a one-dimensional half-filled extended Hubbard model with nearest neighboring four-electron interaction (Q), in addition to the usual two-electron couplings (U, V > 0). The additional four-electron coupling splits independent Gaussian and spin-gap transitions and also leads to the charge-gap transition. For the positive Q, the ground state exhibits three insulating phases, charge-density-wave (CDW), spin-density-wave (SDW) and bond-spin-density-wave (BSDW). For the negative Q, the phase diagram consists of five phases, which, besides the SDW and CDW phases, contain bond-charge-density-wave (BCDW), Luttinger liquid (LL) and Luther-Emery (LE) phases.
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