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Ultrafast Terahertz Nonlinear Optics of Landau Level Transitions in a Monolayer Graphene
Go Yumoto1, Ryusuke Matsunaga1, Hiroki Hibino2,3
1Department of Physics, The University of Tokyo, Tokyo 113-0033, Japan.
Abstract:
We investigated the ultrafast terahertz (THz) nonlinearity in a monolayer graphene under the strong magnetic field using THz pump-THz probe spectroscopy. An ultrafast suppression of the Faraday rotation associated with inter-Landau level (LL) transitions is observed, reflecting the Dirac electron character of nonequidistant LLs with large transition dipole moments. A drastic modulation of electron distribution in LLs is induced by far off-resonant THz pulse excitation in the transparent region. Numerical simulation based on the density matrix formalism without rotating-wave approximation reproduces the experimental results. Our results indicate that the strong light-matter coupling regime is realized in graphene, with the Rabi frequency exceeding the carrier wave frequency and even the relevant energy scale of the inter-LL transition.
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