Enhanced Interactions between Dipolar Polaritons

Title
Enhanced Interactions between Dipolar Polaritons
Authors
임향택Emre ToganStefan FaeltWerner WegscheiderAtac Imamoglu
Issue Date
2018-11
Publisher
Physical review letters
Citation
VOL 121, NO 22, 227402
Abstract
Nonperturbative coupling between cavity photons and excitons leads to the formation of hybrid light-matter excitations, termed polaritons. In structures where photon absorption leads to the creation of excitons with aligned permanent dipoles, the elementary excitations, termed dipolar polaritons, are expected to exhibit enhanced interactions. Here, we report a substantial increase in interaction strength between dipolar polaritons as the size of the dipole is increased by tuning the applied gate voltage. To this end, we use coupled quantum well structures embedded inside a microcavity where coherent electron tunneling between the wells creates the excitonic dipole. Modifications of the interaction strength are characterized by measuring the changes in the reflected light intensity when polaritons are driven with a resonant laser. The factor of 6.5 increase in the interaction-strength-to-linewidth ratio that we obtain indicates that dipolar polaritons could constitute an important step towards a demonstration of the polariton blockade effect, and thereby to form the building blocks of many-body states of light.
URI
http://pubs.kist.re.kr/handle/201004/72482
ISSN
0031-9007
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KIST Publication > Article
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