Volume 117, Number 5, March 2017
|Number of page(s)||6|
|Section||Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties|
|Published online||24 April 2017|
Way to observe the implausible “trion-polariton”
1 Department of Physics, National Cheng Kung University - Tainan, 701 Taiwan
2 Institut des NanoSciences de Paris, Université Pierre et Marie Curie, CNRS 4 place Jussieu, 75005 Paris, France
3 Research Center for Applied Sciences, Academia Sinica - Taipei, 115 Taiwan
Received: 27 December 2016
Accepted: 6 April 2017
Using the composite boson (coboson) many-body formalism, we determine under which conditions “trion-polariton” can exist. Dipolar attraction can bind an exciton and an electron into a trion having an energy well separated from the exciton energy. Yet, the existence of long-lived “trion-polariton” is a priori implausible not only because the photon-trion coupling, which scales as the inverse of the sample volume, is vanishingly small, but mostly because this coupling is intrinsically “weak”. Here, we show that a moderately dense Fermi sea renders its observation possible: on the pro side, the Fermi sea overcomes the weak coupling by pinning the photon to its momentum through Pauli blocking; it also overcomes the dramatically poor photon-trion coupling by providing a volume-linear trion subspace to which the photon is coherently coupled. On the con side, the Fermi sea broadens the photon-trion resonance due to the fermionic nature of trions and electrons; it also weakens the trion binding by blocking electronic states relevant for trion formation. As a result, the proper way to observe this novel polariton is to use a doped semiconductor having long-lived electronic states, a highly bound trion and a Fermi energy as large as a fraction of the trion binding energy.
PACS: 71.36.+c – Polaritons (including photon-phonon and photon-magnon interactions) / 71.35.Pq – Charged excitons (trions) / 71.35.-y – Excitons and related phenomena
© EPLA, 2017
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