# Transport in graphene exposed to a strong electromagnetic field

Event Details

## Event Dates:

Thursday, October 31, 2013 - 6:00am

## Seminar Location:

• Duane Physics Room D142

Sergey Syzranov

## Speaker Affiliation(s):

This talk is devoted to the quasiparticle dynamics in graphene exposed to a linearly-polarised electromagnetic wave of very large intensity. I will demonstrate that low-energy transport in such system can be described by an effective time-independent Hamiltonian, characterised by multiple Dirac points in the first Brillouin zone. Around each Dirac point the spectrum is anisotropic: the velocity along the polarisation of the radiation significantly exceeds the velocity in the perpendicular direction. Moreover, in some of the points the transverse velocity oscillates as a function of the radiation intensity. These features of the spectrum manifest themselves in transport phenomena in irradiated graphene samples. For instance, the conductance of a graphene p-n junction in the regime of strong irradiation depends on the polarisation as $G(\theta)\propto|\sin\theta|^{3/2}$, where $\theta$ is the angle between the polarisation and the p-n interface, and oscillates as a function of the radiation intensity.