2013
DOI: 10.1103/physrevlett.110.137402
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Coherence Expansion and Polariton Condensate Formation in a Semiconductor Microcavity

Abstract: The dynamics of the expansion of the first order spatial coherence g(1) for a polariton system in a high-Q GaAs microcavity was investigated on the basis of Young's double slit experiment under 3 ps pulse excitation at the conditions of polariton Bose-Einstein condensation. It was found that in the process of condensate formation the coherence expands with a constant velocity of about 10(8)  cm/s. The measured coherence is smaller than that in a thermal equilibrium system during the growth of condensate densit… Show more

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Cited by 34 publications
(34 citation statements)
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“…Thus, the decoherence rate of a freely decaying condensate also appears to be quite small. It is significantly smaller than that of a quasiequilibrium condensate formed under a nonresonant excitation [39]. That is well expected as the decoherence in a resonantly pumped system is mainly due to the scattering on phonons, whereas nonresonantly pumped condensates lose their coherence through the interaction with an exciton reservoir that is inevitably excited in the latter case [40,41].…”
Section: Methodsmentioning
confidence: 81%
“…Thus, the decoherence rate of a freely decaying condensate also appears to be quite small. It is significantly smaller than that of a quasiequilibrium condensate formed under a nonresonant excitation [39]. That is well expected as the decoherence in a resonantly pumped system is mainly due to the scattering on phonons, whereas nonresonantly pumped condensates lose their coherence through the interaction with an exciton reservoir that is inevitably excited in the latter case [40,41].…”
Section: Methodsmentioning
confidence: 81%
“…The interference fringes are recorded with the CCD camera behind the monochromator. Contrary to previous reports [17][18][19][20], we have chosen the location of the slit center d with respect to the excitation laser spot as an additional variable to investigate the spatial coherence. d = 0 corresponds to the situation of the double slit placed symmetrically with respect to the excitation laser spot.…”
Section: Methodsmentioning
confidence: 99%
“…This is in particular the case when the coherence is studied underneath the laser spot only as in Refs. [17][18][19]. Promising in this respect are photonic wire structures in which the one-dimensionality suppresses polariton scattering due to the reduced phase space accessible for quasielastic scattering.…”
Section: Introductionmentioning
confidence: 99%
“…Кроме того, взаимодействие экситон-поляритонного конденсата с плотным экситонным резервуаром, формирующемся при межзонном возбуждении, также влияет на его свой-ства. Так в исследованиях пространственной когерент-ности в поляритонных конденсатах при нерезонансном возбуждении было найдено, что она расширяется со скоростью ∼ 10 8 cm/s [16], что на много порядков выше, чем в газе ультрахолодных атомов, в то же время длина когерентности не превышает нескольких десятков µm. Основными причинами декогеренции конденсата, кроме ограниченного времени жизни поляритонов, являются потенциальный беспорядок и взаимодействие с экситон-ным резервуаром [17,18].…”
Section: международная школа-семинар "unclassified