2019/03/23 by Matthew N. Brunetti, Matthew Brunetti, Oleg L. Berman +2
Engineering · Mathematics · Physics and Astronomy · #Condensed matter physics #Electric field #Exciton #Field (mathematics) #Graphene #Mathematics #Physics #Polariton #Quantum and electron transport phenomena #Quantum mechanics #Silicene #Strong Light-Matter Interactions #Thermal Radiation and Cooling Technologies #cond-mat.mes-hall
paper · pdf · doi:10.1103/physrevb.99.195417
published as Phys. Rev. B 99, 195417 (2019)
arxiv created 2019/03/23 · openalex created_date 2019/04/01 · openalex publication_date 2019/05/13 · arxiv updated 2019/05/22 · openalex updated_date 2026/08/05
We study tunable polaritons in monolayers of silicene, germanene, and stanene (Xenes) via an external electric field in an open optical microcavity whose length can be adjusted. An external electric field applied perpendicular to the plane of the Xene monolayer simultaneously changes the band gap and the exciton binding energy, while the variable length of the open microcavity allows one to keep the exciton and cavity photon modes in resonance. First, the Schr"odinger equation for an electron and hole in an Xene monolayer is solved, yielding the eigenergies and eigenfunctions of the exciton as a function of the external electric field. The dependence of the polaritonic properties, such as the Rabi splitting, on the external electric field and on the cavity length, is analyzed. The Berezinskii-Kosterlitz-Thouless (BKT) transition temperature of polaritons is calculated as a function of the external electric field. We analyze and present the conditions for a room-temperature superfluid of lower polaritons by simultaneously maximizing the Rabi splitting and BKT transition temperature.