H. Mashiko, K. Oguri, Yuta Chisuga, Hiroyuki Masuda, Tomohiko Yamaguchi, A. Suda, I. Katayama, J. Takeda, H. Gotoh
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Petahertz optical drive with wide-bandgap materials
We studied petahertz electronic oscillations with 1.16-PHz frequency using gallium nitride (GaN) wide-bandgap semiconductor. An isolated attosecond pulse with coherent broadband spectrum reveals dipole oscillation with 860-as periodicity in the GaN electron and hole system.