標題: Dynamics of Particle-Hole Pair Creation in Graphene
作者: Lewkowicz, M.
Rosenstein, B.
電子物理學系
Department of Electrophysics
公開日期: 13-Mar-2009
摘要: The process of coherent creation of particle-hole excitations by an electric field in graphene is quantitatively described. We calculate the evolution of the current density, number of pairs, and energy after switching on the electric field. In particular, it leads to a dynamical visualization of universal finite resistivity without dissipation in pure graphene. We show that the dc conductivity of pure graphene is pi/2e(2)/h rather than the often cited value of 4/pi e(2)/h. This value coincides with the ac conductivity calculated and measured recently at optical frequencies. The effect of temperature and random chemical potential (charge puddles) are considered and explain the recent experiment on suspended graphene. A possibility of Bloch oscillations is discussed within the tight binding model.
URI: http://dx.doi.org/10.1103/PhysRevLett.102.106802
http://hdl.handle.net/11536/7487
ISSN: 0031-9007
DOI: 10.1103/PhysRevLett.102.106802
期刊: PHYSICAL REVIEW LETTERS
Volume: 102
Issue: 10
起始頁: 0
結束頁: 0
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