2 papers
cond-mat.mes-hall2001
Oscillator strengths of dark charged excitons in the quantum Hall regime
C. Schueller, K. -B. Broocks, Ch. Heyn +1
By direct absorption spectroscopy and comparison to photoluminescence (PL), we investigate negatively charged excitons in dilute two-dimensional electron systems at temperatures do…
cond-mat.mes-hall2001
Far-Infrared Excitations below the Kohn Mode: Internal Motion in a Quantum Dot
Roman Krahne, Vidar Gudmundsson, Christian Heyn +1
We have investigated the far-infrared response of quantum dots in modulation doped GaAs heterostructures. We observe novel modes at frequencies below the center-of-mass Kohn mode.…