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Universal absorption of two-dimensional systems

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Stauber, T. ; Noriega-Pérez, D. ; Schliemann, John
Date of publication of this fulltext: 22 Jul 2015 09:22


We discuss the optical conductivity of several noninteracting two-dimensional semiconducting systems focusing on gapped Dirac and Schrödinger fermions as well as on a system mixing these two types. Close to the band gap, we can define a universal optical conductivity quantum of σ0=116e2ℏ for the pure systems. The effective optical conductivity then depends on the degeneracy factors gs (spin) and ...


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