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Dietl, Sebastian; Wang, Sheng; Schuh, Dieter; Wegscheider, Werner; Kotthaus, Jörg P.; Pinczuk, Aron; Holleitner, Alexander W.; Wurstbauer, Ursula (2017): Collective electronic excitation in a trapped ensemble of photogenerated dipolar excitons and free holes revealed by inelastic light scattering. In: Physical Review B, Vol. 95, No. 8, 85312