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Electrons in graphene are described by massless Dirac Fermions with unusual electrical and optical properties. The Moire superlattice in graphene/boron nitride heterostructure strongly modifies the electronic structure, and leads to unusual changes in infrared absorption.
We investigate the carrier relaxation dynamics in graphene oxide (GO) using ultrafast optical-pump terahertz-probe spectroscopy. Unlike graphene, we observe the dynamics of GO show rapid percolation behaviors related to the multi-particle Auger scattering.
Carrier dynamics in a single-layered graphene has been studied by ultrabroadband terahertz time domain ellipsometric spectroscopy and time resolved optical pump THz probe technique. We successfully observed the frequency-dependent sheet conductivity of the optically-pumped graphene with and without the photo excitation. Above the optical fluence of 200 µJ/cm2, the negative conductivity indicating...
We report the nonlinear THz conductivity of graphene. The heating of charge carriers by strong THz pulses results in a reduction of the high-frequency conductivity of graphene, in spite of reduced scattering for high-energy carriers.
Broadband terahertz modulation at room temperature is realized using electrically gated graphene in the 1–10 THz range. By gate voltage modulation, the Drude conductivity of graphene varies along with the THz transmission response.
We report temperature dependence and thermal hysteresis behavior of terahertz transmission through photoexcited graphene. We vary the temperature between room temperature and 1800°C, and use the optical-pump/terahertz-probe differential transmission technique.
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