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Quantized Rabi oscillations and circular dichroism in quantum Hall systems

par Tran, Duc-Thanh ;Cooper, Nigel N.R.;Goldman, Nathan
Référence Physical Review A, 97, 6, 061602
Publication Publié, 2018-06

Article révisé par les pairs

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Résumé :

The dissipative response of a quantum system upon periodic driving can be exploited as a probe of its topological properties. Here we explore the implications of such phenomena in two-dimensional gases subjected to a uniform magnetic field. It is shown that a filled Landau level exhibits a quantized circular dichroism, which can be traced back to its underlying nontrivial topology. Based on selection rules, we find that this quantized effect can be suitably described in terms of Rabi oscillations, whose frequencies satisfy simple quantization laws. We discuss how quantized dissipative responses can be probed locally, both in the bulk and at the boundaries of the system. This work suggests alternative forms of topological probes based on circular dichroism.