Phase change in terahertz waves emitted from differently doped graphite: The role of carrier drift

Muhammad Irfan, Jong Hyuk Yim, Changyoung Kim, Sang Wook Lee, Young Dahl Jho

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14 Scopus citations

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 languageEnglish
Article number201108
JournalApplied Physics Letters
Volume103
Issue number20
DOIs
StatePublished - 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).

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