skip to main content

SciTech ConnectSciTech Connect

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

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.
Authors:
; ;  [1] ;  [2] ;  [3]
  1. School of Information and Communications, Gwangju Institute of Science and Technology, Gwangju 500-712 (Korea, Republic of)
  2. Institute of Physics and Applied physics, Yonsei University, Seoul 120-749 (Korea, Republic of)
  3. Division of Quantum Phases and Devices, School of Physics, Konkuk University, Seoul 143-701 (Korea, Republic of)
Publication Date:
OSTI Identifier:
22254069
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 103; Journal Issue: 20; Other Information: (c) 2013 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; DOPED MATERIALS; FILMS; GRAPHITE; LASERS; MONOCRYSTALS; POLARIZATION; POLYCRYSTALS; PULSES