Theories for electron transport in 2D materials

Date: 7 June 2017

Venue: UAntwerpen, Campus Groenenborger, Building U, room U.241 - Groenenborgerlaan 171 - 2020 Antwerpen (route: UAntwerpen, Campus Groenenborger)

Time: 4:00 PM - 5:00 PM

Organization / co-organization: Condensed Matter Theory

Short description: Condensed Matter Theory seminar presented by Miša Anđelković

Theories for electron transport in 2D materials

The advance in the semiconductor industry has lead to a significant decrease of the characteristic dimensions of the devices in the last decades. Together with the isolation of the first 2D materials, quantum phenomena started to be of great importance, which induced the need for different theories that could properly describe the electronic properties of such structures.

The first part of the talk will be based on the brief review of different theoretical frameworks for electron transport calculations, starting from macroscopic semiclassical Boltzmann theory, to quantum theories such as Kubo linear response and Landauer-Büttiker scattering formalism. We’ll try to emphasize not only their domains of validity and limitations but also their connection.

After the introductory part, we will focus on the numerical effort needed for calculation of transport properties using Kubo formulas in the linear response regime, which is suitable when one is interested in bulk properties of different materials. We will show the application of the method to different structures in the presence of various fields and disorder realisations. Remarkable properties such as preservation of chiral symmetry in the presence of vacancy disorder will be shown in graphene, and it’s breaking in twisted bilayer graphene.

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