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Ultrafast Photoresponse of 2D and 3D Dirac Materials (A.K. Sood, Indian Institute of Science)

Event Details:

Monday, August 13, 2018
11:00am - 12:00pm PDT


Spilker 143

Ultrafast Photoresponse of 2D and 3D Dirac Materials

A.K. Sood
Department of Physics, Indian Institute of Science, Bangalore, India

Ultrafast lasers offer unique possibilities to control and probe transient processes in quantum 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 materials. My talk will discuss some of our recent work on the dynamics of optical pump induced photocarriers in single and bilayer graphene as well asgraphane (hydrogen functionalized graphene) as probe bytime-resolved optical pump-terahertz probe spectroscopy [1,2].

Second part of my talk will address ultrafast dynamics ofrecently discovered 3D analogues of graphene (massless Dirac Fermions in 3D), namely Weyl and Dirac semimetals-NbAs, TaAs and Cd3As2, using optical pump-probe spectroscopy.

[1] Srabani Kar, Van Luan Nguyen, Dipti R. Mohapatra, Young Hee Lee and A.K. Sood, Ultrafast Spectral-response of Bilayer Graphene: Optical pump-Terahertz Probe Spectroscopy and Theory. ACS Nano DOI: 10.1021/acsnano.7b08555 (2018)

[2] Srabani Kar, Dipti R. Mohapatra and A.K. Sood, Tunable terahertz photoconductivity of hydrogen functionalized graphene using optical pump-terahertz probe spectroscopy, Nanoscale (2018)

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