Structure inversion asymmetry enhanced electronic structure and electrical transport in 2D A3SnO(A=Ca,Sr,and Ba)antiperovskite monolayers  

作　　者：Syed Muhammad Alay-e-Abbas Ghulam Abbas Waqas Zulfiqar Muhammad Sajjad Nirpendra Singh J.Andreas Larsson 

机构地区：[1]Applied Physics,Division of Materials Science,Department of Engineering Sciences and Mathematics,LuleåUniversity of Technology,97187 Luleå,Sweden [2]Computational Materials Modeling Laboratory,Department of Physics,Government College University,Faisalabad 38040,Pakistan [3]Department of Energy Conversion and Storage,Technical University of Denmark,2800 Kgs.Lyngby,Denmark [4]Department of Physics,Khalifa University of Science and Technology,Abu Dhabi-127788,United Arab Emirates [5]Center for Catalysis and Separation(CeCaS),Khalifa University of Science and Technology,Abu Dhabi-127788,United Arab Emirates

出　　处：《Nano Research》2023年第1期1779-1791,共13页纳米研究（英文版）

基　　金：The computations were enabled by resources provided by the Swedish National Infrastructure for Computing(SNIC)at HPC2N and NSC partially funded by the Swedish Research Council through grant agreement no.2018-05973.

摘　　要：Anti-perovskites A3SnO(A=Ca,Sr,and Ba)are an important class of materials due to the emergence of Dirac cones and tiny mass gaps in their band structures originating from an intricate interplay of crystal symmetry,spin–orbit coupling,and band overlap.This provides an exciting playground for modulating their electronic properties in the two-dimensional(2D)limit.Herein,we employ first-principles density functional theory(DFT)calculations by combining dispersion-corrected SCAN+rVV10 and mBJ functionals for a comprehensive side-by-side comparison of the structural,thermodynamic,dynamical,mechanical,electronic,and thermoelectric properties of bulk and monolayer(one unit cell thick)A3SnO anti-perovskites.Our results show that 2D monolayers derived from bulk A3SnO anti-perovskites are structurally and energetically stable.Moreover,Rashba-type splitting in the electronic structure of Ca3SnO and Sr3SnO monolayers is observed owing to strong spin–orbit coupling and inversion asymmetry.On the other hand,monolayer Ba3SnO exhibits Dirac cone at the high-symmetryΓpoint due to the domination of band overlap.Based on the predicted electronic transport properties,it is shown that inversion asymmetry plays an essential character such that the monolayers Ca3SnO and Sr3SnO outperform thermoelectric performance of their bulk counterparts.

关 键 词：electrical transport anti-perovskites low-dimensional materials electronic structure mechanical properties 

分 类 号：O17[理学—数学]