Charge Dynamics and Electronic Structures of Monolayer MoS

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概要

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• THz absorption and spectroscopic ellipsometry were used to investigate the charge dynamics and electronic structures of chemical-vapor-deposited monolayer MoS<inf>2</inf>films. THz conductivity displays a coherent response of itinerant charge carriers at zero frequency. Drude plasma frequency ({\sim}7 THz) decreases with decreasing temperature while carrier relaxation time ({\sim}26 fs) is almost temperature independent. The absorption spectrum of monolayer MoS<inf>2</inf>shows a direct 1.95 eV band gap and charge transfer excitations that are {\sim}0.2 eV higher than those of the bulk counterpart. The ground-state exciton binding energy is found to be about 0.48 eV.

• 2013-12-25

著者

• Liu Hsiang-lin

  Department Of Physics National Taiwan Normal University

• Shen Chih-Chiang

  Department of Physics, National Taiwan Normal University, Taipei 11677, Taiwan

• Liu Hsiang-Lin

  Department of Physics, National Taiwan Normal University, Taipei 11677, Taiwan

• Hsu Yu-Te

  Institute of Atomic and Molecular Sciences, Academia Sinica, Taipei 10617, Taiwan

• Li Lain-Jong

  Institute of Atomic and Molecular Sciences, Academia Sinica, Taipei 10617, Taiwan

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• Charge Dynamics and Electronic Structures of Monolayer MoS

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