Extremely imbalanced two-dimensional electron-hole-photon systems
| Autor: | Francesca Maria Marchetti, Allan H. MacDonald, Antonio Tiene, Jesper Levinsen, Meera M. Parish, Jonathan Keeling |
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| Přispěvatelé: | The Royal Society, EPSRC, University of St Andrews. School of Physics and Astronomy, University of St Andrews. Condensed Matter Physics, UAM. Departamento de Física Teórica de la Materia Condensada |
| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
Charge Imbalance
Photon Electron-Hole Bilayers TK FOS: Physical sciences Physics::Optics 02 engineering and technology Dielectric Electron hole Planar Microcavity 01 natural sciences Two Dimensional Electrons Photon field TK Electrical engineering. Electronics Nuclear engineering Transition Metal Dichalcogenides Mesoscale and Nanoscale Physics (cond-mat.mes-hall) 0103 physical sciences Bound state Limit (mathematics) 010306 general physics QC Condensed Matter::Quantum Gases Physics Condensed Matter - Mesoscale and Nanoscale Physics Strong Coupling Doping Física Charge (physics) DAS 021001 nanoscience & nanotechnology QC Physics Quantum Gases (cond-mat.quant-gas) Single Quantum Well Long-range Coulomb Interaction Atomic physics Condensed Matter - Quantum Gases 0210 nano-technology |
| Zdroj: | Biblos-e Archivo. Repositorio Institucional de la UAM instname |
| Popis: | We investigate the phases of two-dimensional electron-hole systems strongly coupled to a microcavity photon field in the limit of extreme charge imbalance. Using variational wave functions, we examine the competition between different electron-hole paired states for the specific cases of semiconducting III-V single quantum wells, electron-hole bilayers, and transition metal dichalcogenide monolayers embedded in a planar microcavity. We show how the Fermi sea of excess charges modifies both the electron-hole bound state (exciton) properties and the dielectric constant of the cavity active medium, which in turn affects the photon component of the many-body polariton ground state. On the one hand, long-range Coulomb interactions and Pauli blocking of the Fermi sea promote electron-hole pairing with finite center-of-mass momentum, corresponding to an excitonic roton minimum. On the other hand, the strong coupling to the ultra-low-mass cavity photon mode favors zero-momentum pairs. We discuss the prospect of observing different types of electron-hole pairing in the photon spectrum. 18 pages, 14 figures |
| Databáze: | OpenAIRE |
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