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Pair-excitation energetics of highly correlated many-body states

A microscopic approach is developed to determine the excitation energetics of highly correlated quasi-particles in optically excited semiconductors based entirely on a pair-correlation function input. For this purpose, the Wannier equation is generalized to compute the energy per excited electron-hole pair of a many-body state probed by a weak pair excitation. The scheme is verified for the degenerate Fermi gas and incoherent excitons. In a certain range of experimentally accessible parameters, a new stable quasi-particle state is predicted which consists of four to six electron-hole pairs forming a liquid droplet of fixed radius. The energetics and pair-correlation features of these "quantum droplets" are analyzed.

preprint2013arXivOpen access
M. MootzM. KiraS. W. Koch
cond-mat.mes-hallcond-mat.other
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M. MootzM. KiraS. W. Koch

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