Edge-Corrected Mean-Field Hubbard Model: Principle and Applications in 2D Materials

Frontiers in Physics

Wang, Tianlei¹  Peng, Da¹  Zhang, Xi¹  Chen, Wencong¹  Wang, Sanmei² 

[1] Guangdong Provincial Key Laboratory of Micro/Nano Optomechatronics Engineering, Institute of Nanosurface Science and Engineering, Shenzhen University, Shenzhen, China;Key Laboratory of Low-Dimensional Materials and Application Technologies (Ministry of Education) and School of Materials, Science and Engineering, Xiangtan University, Hunan, China

关键词: Hubbard model;    Tight-binding;    2D material;    nanoribbon;    BOLS;    edge effect;    electronic structure;   

DOI  :  10.3389/fphy.2017.00013

学科分类：物理（综合）

来源: Frontiers

【 摘 要 】

This work reviews the current progress of tight-binding methods and the recent edge-modified mean-field Hubbard model. Undercoordinated atoms and nonbonding electrons exist widely in nanomaterials and in network-structural materials with their impact under-estimated. A quantum theory was proposed to calculate the under-coordinated effects on the electronic structure of materials by incorporating bond order-length-strength (BOLS) correlation theory to mean-field Hubbard model, i.e. BOLS-HM. Consistency between the BOLS-HM calculation and density functional theory (DFT) calculation on 2D materials verified that i) bond contractions and potential well depression occur at the edge of graphene, phosphorene, and antimonene nanoribbons; ii) the physical origin of the band gap opening of graphene, phosphorene, and antimonene nanoribbons lays in the enhancement of edge potentials and hopping integrals due to the shorter and stronger bonds between undercoordinated atoms; iii) the band gap of 2D material nanoribbons expand as the width decreases due to the increasing under-coordination effects of edges which modulates the conductive behaviors; and iv) nonbond electrons at the edges and atomic vacancies of 2D material accompanied with the broken bond contribute to the Dirac-Fermi polaron (DFP) with a local magnetic moment.

【 授权许可】

CC BY