Ultrafast femtosecond laser pulses offer unique possibilities to probe transient processes in nano materials. Following photoexcitation by a femtosecond laser pulse, the carrier dynamics includes many important processes like thermalization, energy relaxation, exciton formation and spin dynamics which are impacted by dimensionality. Their understanding is crucial not only for many optoelectronic applications, but also to gain a deeper understanding of physical processes in nano-materials.
My talk will present our recent results on 2D materials to showcase the power of Raman and ultrafast spectroscopies combined with transparent measurements for deeper understanding of their electronic and optical properties. Examples from our recent work will include: (i) Phonon renormalization due to gate doping by in-situ Raman spectroscopy of a few layer 2H-MoTe2 and ReS2, which will highlight the role of symmetry dependent electron phonon interactions; (ii) Terahertz photoconductivity of single and bilayer graphene using optical pump terahertz probe spectroscopy; and (iii) Hot carrier generation in graphene using ultrathin gold films with periodic array of holes.
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