NUIM Math. Physics seminar

Simon Hands  
University of Swansea

Graphene:Relativity in a Pencil Stroke

Friday 12 March at 3.00 p.m.

CS1 (Computer Science Lecture Theatre 1), Callan Building, NUIM North Campus

Abstract:

I review recent experimental and theoretical work on graphene, a remarkable two-dimensional crystal formed of a single layer of carbon atoms arranged in a honeycomb lattice. Electron motion on the honeycomb is governed at long de Broglie wavelengths by a Dirac Hamiltonian having an effective speed of light v_F roughly 10^6 m/s. I introduce an effective non-covariant field theory in this regime in which electron interactions are due to a Coulomb force, and study it using numerical lattice field theory techniques. As the coupling strength is varied the model undergoes a phase transition from a conductor to an insulator. The resulting quantum critical point may thus characterise universal features of electron transport in graphene.

All are welcome. Tea/coffee and biscuits to follow. For directions to the Dept. please check http://www.thphys.nuim.ie/map.php