2020/08/26 by M. Neşet Çınar, Hâldun Sevinçli, H. Sevinçli · 4 citations
Materials Science · Physics and Astronomy · #2D Materials and Applications #Advanced Thermoelectric Materials and Devices #Anisotropy #Crossover #Electron #Graphene #Isotropy #Non-equilibrium thermodynamics #Symmetry (geometry) #Thermoelectric effect #Topological Materials and Phenomena #cond-mat.mes-hall
paper · pdf · doi:10.1103/physrevapplied.14.024075
published in Physical Review Applied 14(2) (American Physical Society)
openalex created_date 2020/08/13 · openalex publication_date 2020/08/26 · arxiv created 2020/09/03 · arxiv updated 2020/09/04 · openalex updated_date 2026/08/05
Graphene antidot lattices (GALs) are two-dimensional (2D) monolayers with periodically placed holes in otherwise pristine graphene. We investigate the electronic properties of symmetric and asymmetric GAL structures having hexagonal holes, and show that anisotropic 2D GALs can display a dimensional crossover such that effectively one-dimensional (1D) electronic structures can be realized in two dimensions around the charge neutrality point. We investigate the transport and thermoelectric properties of these 2D GALs by using the nonequilibrium Green function method. Dimensional crossover manifests itself as transmission plateaus, a characteristic feature of 1D systems, and enhancement of thermoelectric efficiency, where thermoelectric figure of merit, zT, can be as high as 0.9 at room temperature. We also study the transport properties in the presence of Anderson disorder and find that mean free paths of effectively 1D electrons of anisotropic configuration are much longer than their isotropic counterparts. We further argue that dimensional crossover due to broken symmetry and enhancement of thermoelectric efficiency can be nanostructuring strategy virtually for all 2D materials.