Abstract
We investigate characteristics of THz waves radiated from differently doped graphite samples excited by femtosecond laser pulses. Between n-type single-crystalline graphite and p-type polycrystalline graphite films, we observe the phase reversal of THz waves regardless of excitation energy variations around K-valley. In addition, variations in other parameters such as excitation fluence and azimuthal angle produce no changes in the phase of THz waves, which correlate well with the opposite dipole polarization between differently doped samples rather than unidirectional diffusive transport.
Original language | English |
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Article number | 201108 |
Journal | Applied Physics Letters |
Volume | 103 |
Issue number | 20 |
DOIs | |
State | Published - 11 Nov 2013 |
Bibliographical note
Funding Information:This work was supported by the Bio-imaging Research Center and National Research Foundation of Korea (NRF) funded by the Ministry of Education, Science, and Technology (2012-042232).