Stauber, T. and Noriega-Perez, D. and Schliemann, J. (2015) Universal absorption of two-dimensional systems. PHYSICAL REVIEW B, 91 (11): 115407. ISSN 1098-0121, 1550-235X
Full text not available from this repository.Abstract
We discuss the optical conductivity of several noninteracting two-dimensional semiconducting systems focusing on gapped Dirac and Schrodinger 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 sigma(0) = 1/16 e(2)/(h) over bar for the pure systems. The effective optical conductivity then depends on the degeneracy factors g(s) (spin) and g(v) (valley) and on the curvature around the band gap nu, i.e., it generally reads sigma = g(s)g(v)nu sigma(0). For a system composed of both types of carriers, the optical conductivity becomes nonuniversal.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | TOPOLOGICAL INSULATORS; MINIMAL CONDUCTIVITY; GRAPHENE; QUANTUM; |
| Subjects: | 500 Science > 530 Physics |
| Divisions: | Physics > Institute of Theroretical Physics Physics > Institute of Theroretical Physics > Chair Professor Grifoni > Group John Schliemann |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 24 Jul 2019 07:44 |
| Last Modified: | 24 Jul 2019 07:44 |
| URI: | https://pred.uni-regensburg.de/id/eprint/5804 |
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