Dresden 2020 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 65: 2D Materials and their Heterostructures III (joint session DS/HL)

HL 65.4: Vortrag

Donnerstag, 19. März 2020, 11:45–12:00, CHE 89

Dimensional crossover due to broken symmetry and enhanced thermoelectric performance in graphene antidot lattices — •Mustafa Neşet Çinar and Hâldun Sevinçli — Deparment of Materials Science and Engineering, Izmir Institute of Technology, 35430 Urla Izmir Turkey

Graphene antidot lattices (GALs) are monolayers with periodically placed holes in otherwise pristine graphene. We investigate the electronic properties of symmetric and symmetric GAL structures having hexagonal holes, and show that anisotropic GALs can display a dimensional crossover such that quasi-one-dimensional (Q1D) electronic structures can be realized in two-dimensional systems around the charge neutrality point. We investigate the transport and thermoelectric properties of these Q1D GALs by using non-equilibrium Green function (NEGF) method. Dimensional crossover manifests itself as transmission plateaus, a characteristic feature of Q1D systems, and enhancement of thermoelectric efficiency, where thermoelectric figure of merit, zT, can be as high as 0.9 at room temperature. We further study the transport properties in the presence of Anderson disorder and and that mean-free-paths of Q1D electrons of anisotropic configuration are much longer than those of isotropic one at the same energies.