Regensburg 2019 – scientific programme
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TT: Fachverband Tiefe Temperaturen
TT 22: Superconductivity: Theory
TT 22.4: Talk
Tuesday, April 2, 2019, 10:15–10:30, H7
Feasible model for light-induced interband pairing — Sergio Porta1,2, •Lorenzo Privitera2, Niccolò Traverso Ziani1,2, Fabio Cavaliere1, and Björn Trauzettel2 — 1Dipartimento di Fisica, Università di Genova, 16146 Genova, Italy — 2Institute of Theoretical Physics and Astrophysics, University of Würzburg, 97074 Würzburg, Germany
Recent theoretical works [1,2] have highlighted the existence of a purely electronic mechanism for the appearance of non-equilibrium superconductivity in a resonantly driven semiconductor with repulsive interband interactions. The original proposals relied anyway on the existence of a specific fermionic dissipation mechanism and the careful simultaneous tailoring of the electronic dispersion relation and the electron-electron interaction.
In this work we show that this mechanism is actually more general and does not need any special tuning of the parameters. When considering a pair of bands with the same sign of concavity, we indeed demonstrate that interband pairing emerges under the natural assumptions of the presence of phononic baths and radiative recombination. In light of these findings, we show how the appearance of superconductivity can be understood in terms of standard equilibrium interband BCS theory. Finally, we conclude by presenting a phase diagram for the steady state of the model.
G. Goldstein, C. Aron, and C. Chamon, Phys. Rev. B 91, 054517 (2015)
O. Hart, G. Goldstein, C. Chamon and C. Castelnovo, arXiv:1810.12309