arXiv subjects

Nathaniel C. Brandt

Publications and source records attributed to Nathaniel C. Brandt.

2 recordsLinked to original sources

arXiv2011

Nonlinear THz Conductivity Dynamics in CVD-Grown Graphene

We report strong THz-induced transparency in CVD-grown graphene where 92%-96% of the peak-field is transmitted compared to 74% at lower field strength. Time-resolved THz-pump/THz-probe studies reveal that the absorption recovers in 2-3 ps. The induced transparency is believed to arise from nonlinear pumping of carriers in graphene which suppresses the mobility and consequently the conductivity in a spectral region where the light-matter interaction is particularly strong.

cond-mat.mtrl-sci↗

arXiv2009

Terahertz Kerr effect

We have observed optical birefringence in liquids induced by single-cycle THz pulses with field strengths exceeding 100 kV/cm. The induced change in polarization is proportional to the square of the THz electric field. The time-dependent THz Kerr signal is composed of a fast electronic response that follows the individual cycles of the electric field and a slow exponential response associated with molecular orientation.

cond-mat.other↗