Evidence for condensation of excitons in double quantum wells
L.V. Butova,
A. Zrennerb,
M. Hagnb,
G. Abstreiterb,
G. Boehmb,
G. Weimannb aInstitute of Solid-State Physics, Russian Academy of Sciences, Chernogolovka, Moscow Region, Russian Federation bW. Schottky Institute, Munchen Technical University, Munchen, Germany