Quantum-entanglement entropy and double occupancy in a 1-D Holstein-Hubbard model at half-filling

被引：0

作者：

Malik, M. Zahid ^{[1
]}

Chatterjee, Ashok ^{[1
]}

机构：

[1] Univ Hyderabad, Sch Phys, Hyderabad 500046, India

来源：

PHYSICA E-LOW-DIMENSIONAL SYSTEMS & NANOSTRUCTURES | 2021年 / 133卷

关键词：

Holstein-Hubbard model; Quantum-entanglement entropy; Double occupancy; CDWSDW transition; Intermediate metallic phase; Semi-exact solution; PHASE-DIAGRAM; SYSTEMS;

D O I：

10.1016/j.physe.2021.114784

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

The nature of the cross-over region of the spin-density wave and the charge-density wave phases of the onedimensional Holstein-Hubbard model is examined at half filling. The vibrational modes have been removed by applying a set of canonical transformations followed by an averaging with a many-phonon state. The resulting effective Hubbard Hamiltonian is dealt exactly by using the method of Bethe-Ansatz to get the ground state energy of the system. The quantum entanglement entropy and double occupancy are calculated at the boundary of the spin and charge density wave phases to confirm the existence of an intervening metallic phase.

引用

页数：6

共 26 条

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[26] Existence of an intervening metallic phase at the transition region of the charge-density-wave phase and the spin-density-wave phase in the 1-D Hubbard-Holstein model
Malik, Mohammed Zahid
Mukhopadhyay, Soma
Chatterjee, Ashok
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