Tunable thermopower in a graphene-based topological insulator

Details Tunable thermopower in a graphene-based topological insulator Tunable thermopower in a graphene-based topological insulator

2011-09-26

arxiv.org/abs/1109.5568v1

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

6 pages, 3 figures

Scientific paper

Gapped materials can possess unique topological properties and robust propagating states at their boundaries. The associated transport properties allow fascinating new electronic and spintronic devices. Recently a new class of spin-polarized edge states has been discovered in the so-called topological insulators. However, probing these edge states through transport has proved to be challenging. We explore the properties of a new putative material: a graphene layer with a random deposition of Indium adatoms at its surface. While this system is, by construction, very disordered, we find that it exhibits an extremely stable topological quantum spin Hall phase with no signature of the spatial inhomogeneities of the adatom configuration. This robustness opens the route to a much easier experimental realization of this topological phase. We additionally find this material to be a very promising candidate for thermopower generation with a target temperature tunable from 1 to 80 K and an efficiency ZT close to one.

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