Analytic and geometric properties of photoinduced effects in noncentrosymmetric crystals: Photovoltaic current and optical rectification
Institute of Physics, University of Tartu - Riia 142, 51014 Tartu, Estonia, EU
Accepted: 15 December 2010
An original dispersion relation between the stationary coherent nonlinear optical responses by current and polarisation is obtained. The dispersion relation provides a new complementary tool that can be employed to study light-induced charge transport models and facilitate experimental data analysis. It is shown that the origin of the coherent current and the dc-polarisation induced in a noncentrosymmetric crystal under illumination is related to the theory of the Berry phase and can be represented in terms of the renormalised geometric potentials. This renormalisation originates from the extra phase difference acquired by a carrier in the light field on the quantum transition between the electronic bands. The gauge invariance of the corresponding expressions for the current and the polarisation is demonstrated.
PACS: 72.40.+w – Photoconduction and photovoltaic effects / 03.65.Vf – Phases: geometric; dynamic or topological / 42.50.Nn – Quantum optical phenomena in absorbing, amplifying, dispersive and conducting media; cooperative phenomena in quantum optical systems
© EPLA, 2010