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. 2016 Oct 10;7:13074. doi: 10.1038/ncomms13074

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Copyright © 2016, The Author(s)

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Photon-dressed ab initio Floquet bands of Kramer's pair K,K', for red (a,b) and blue (c,d) detuning. A red-detuned (blue-detuned) pump generically brings into resonance a ring of states of the E′ higher-energy band ( VB) with the A′ CB, while leaving the VB (higher-energy band) off-resonant. Electric dipole coupling mixes the equilibrium orbital characters at K,K' while lifting degeneracies between the CB and photon-dressed copies of the other bands (b,d). The ensuing photo-induced hybridization gap leads to topologically non-trivial band inversion at a single valley. (e) The corresponding C_3h single group selection rules at K,K' for circular polarization (see Supplementary Note 1, table 2 for a double group generalization).

Inline graphic — Photon-dressed ab initio Floquet bands of Kramer's pair K,K', for red (a,b) and blue (c,d) detuning. A red-detuned (blue-detuned) pump generically brings into resonance a ring of states of the E′ higher-energy band ( VB) with the A′ CB, while leaving the VB (higher-energy band) off-resonant. Electric dipole coupling mixes the equilibrium orbital characters at K,K' while lifting degeneracies between the CB and photon-dressed copies of the other bands (b,d). The ensuing photo-induced hybridization gap leads to topologically non-trivial band inversion at a single valley. (e) The corresponding C_3h single group selection rules at K,K' for circular polarization (see Supplementary Note 1, table 2 for a double group generalization).